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▶️ The first thing someone does in a podcast app is add some podcasts, and most active Overcast users add at least two new podcasts each month. Over 80% of podcasts are added to Overcast by searching, with the vast majority as searches for a specific podcast by name (rather than searching for generic keywords, such as “business”). Good search is a critical, differentiating feature of any podcast app. I’m not satisfied if the podcast you’re looking for is somewhere in the middle of a long list — I want it to be the first one, displayed quickly, after typing the fewest characters possible. I’ve been building toward this by analyzing years of popularity statistics and anonymous search data. Instant Search is the next step in Overcast’s search evolution. It combines a small local cache with a highly optimized search service to give the most relevant results immediately as you type, even after only a single letter.1 It’s a dramatic, delightful improvement to a critical, frequently used feature. This was a lot of fun to build, and I’m proud of it. See for yourself! Overcast is free on the App Store. If Instant Search isn’t instant right after you update, the cache hasn’t fully downloaded yet. It’s downloaded weekly, only on Wi-Fi, and is less than 5 MB. ↩︎
28th Jan 2019

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More from Marco.org

Bob and Van

For the first half of my childhood in suburban Ohio, we lived next to Bob. Bob and his wife were a kind, reserved older couple who decorated their home mostly with crucifixes and talked about Jesus a lot. Bob helped my mom with a lot of common household tasks after my dad died. When she woke up to a small fire on our deck, she didn’t call the fire department — she called Bob.1 I never learned any of Bob’s political views, though I can make some guesses in retrospect. They never mattered. He was just our neighbor. We later moved, and hit the neighbor jackpot with Van. Van was deeply kind, generous, and friendly — the sort of neighbor everyone wishes for. In my lazy teenage years, he’d often mow our lawn or shovel our snow for us before I even woke up. As his mobility later declined, I was honored to return the favor. Van and his delightful wife passed away years ago, before I learned how either of them felt on any political issue. If they were my neighbors today, how likely would that be? *     *     * If I learn today that my neighbors have political views that my “side” considers unacceptable and unforgivable, should I be able to have dinner at their house, shovel their snow, or even greet them outside? Should I be condemned for supporting or associating with them in non-political contexts? Should I be condemned for not publicly condemning them myself? While privilege and power dynamics play a complex and unavoidable role in this, I don’t want to associate with any community that would insist on either of those.2 And I can’t help but feel that maybe we were better off before we knew everyone’s hot takes on everything. The town coffee shop was just a coffee shop. We weren’t publicly shamed for going there because one of the owners was an ass. It was just a place to hang out with our friends. Our casual work friends were just casual work friends. We didn’t expect them to take positions on the world’s most complicated conflicts. We could just talk about weather and TV shows, and maybe sometimes get a beer after work. And our neighbors were just our neighbors. That was the day I learned the word “SHIT!” ↩︎ Somewhere on Bob’s wall might’ve been a relevant statement from an influential political dissident about casting the first stone. ↩︎

a week ago 1 votes
Unforgetful

I have ADHD. Probably.1 My entire adolescence was defined by forgetting to do my homework, disappointing everyone around me, and being told by every adult that I was lazy, “just” needed to try harder, and wasn’t living up to my potential. I’ll be working on the resulting shame and anxiety for the rest of my life.2 If someone tells me, “Remember to pick up the dry cleaning tomorrow,” I definitely won’t remember. If someone tells me, “Remember to put the laundry in the dryer in ten minutes,” I probably won’t even remember that. If you’re thinking, “It’s just ten minutes! Nobody can possibly forget that,” I have made an app that’s probably not for you. *     *     * Computers saved me. Despite constantly being told that I’d never get a good job, computers provided a lucrative career path filled with even worse academic performers who couldn’t care less about my grades. What a stroke of luck! I’d be mediocre to terrible at most jobs, but I turned out to be very good at using computers to turn coffee and Phish into money. But computers also save me in smaller, everyday ways. They help me remember. *     *     * Sorry, I just had to go put the laundry in the dryer, which I had forgotten. Really. It’s that bad. *     *     * Calendar alarms changed my life. Events without alarms don’t happen. (If you’re thinking, “Why doesn’t he just check his calendar?” I have made an app that’s probably not for you.) I had less success with reminders until we had ubiquitous voice capture. If I think of something at inconvenient times, like while driving or exercising, I need to capture it immediately or I’ll forget. It cannot wait until I get to my phone or computer. It has to be recorded right then or it’s gone. Siri, for all of its faults, has always been very good at creating tasks in Apple’s Reminders app — and Siri is everywhere. Computer. Phone. Car. Watch. I can almost always ask Siri to add something to Reminders. So Reminders’ integration and ubiquity are invaluable to me. The Reminders app, though, doesn’t fit me at all. I don’t like how it looks, how it works, or how it’s organized. Hell, I don’t even like its icon. There’s nothing about it I like. So I never open it. (Not as if I’d ever remember to check it anyway.)3 Most of my Reminders interaction has always been via Siri and notifications. And that fits me very well, with three major exceptions: If I say “Remind me to buy milk,” but I forget to specify a time (or Siri misses it), Reminders will never notify me, and I’ll never check the app, so it’ll be lost. If I inadvertently dismiss a Reminders notification without snoozing it, Reminders will never notify me about it again, so it’ll be lost. When I do snooze a Reminders notification, which I do a lot, the snooze options suck.4 This spring, I made myself an app to fix all three, and… it escalated. I’ve been using it for months, and it has profoundly improved my life. Today, I’m releasing it, in hopes that maybe it can help other people, too. *     *     * Introducing Unforgetful. The concept is simple: Reminders for ADHD. This means: It’s impossible to lose a task. Notifications always repeat, even if you miss or dismiss them, until the task is completed or deleted. Designed for procrastination. Snoozing is a core feature, with thoughtful intervals that scale as you snooze a task more. Nothing is hidden away. A hidden task is a forgotten task. No folders, no tags, no organization, no different views or modes. No judgment or shame. Nothing is overdue. You’re not in trouble. Everything is either due now or in the future. Didn’t get to it today? Maybe tomorrow. Every day is a fresh start. And Unforgetful does all of that with your Reminders data. That means: Siri works perfectly, everywhere. Just say “Remind me…” without having to specify an app. It replaces your Reminders notifications. Turn them off, turn these on. No import. This isn’t a new system to learn or migrate into. Your Reminders data is just… there. No export. If you try Unforgetful and it’s not for you, just delete it and turn Reminders notifications back on, and all of your data is right there in Reminders. Mix and match. Don’t like it everywhere? You can still use Reminders on your Vision Pro or whatever, or simultaneously use Unforgetful with Reminders or any other app that uses Reminders data. I’ve optimized lots of features and details for ADHD, too: Fast capture with dictation. Tap the microphone button in Unforgetful — or its full suite of widgets, or its Lock Screen or Control Center controls — and quickly dictate a task.5 Spaced-out notifications, not an overwhelming pile at once. If multiple tasks are set to alert you at the same time, they space themselves out so you’re not barraged with a hopeless stack of obligations. And the order changes every day, so nothing gets lost between things. Recurring-task backlogs don’t pile up. If you miss multiple intervals for a recurring task, completing it doesn’t make you click through all of your past failures to get to the present day… it just schedules the next one from now. Remind me 5 minutes after I get home. Location-based reminders can notify you after a set delay. Because if a “remind me when I get home” task fires as I pull into the driveway, I’ll forget it by the time I’m inside, unloaded, and ready to do anything about it. Unforgetful is a Mac and iOS app that’s $19.99 per year (US). One subscription buys all platforms. There’s a one-month free trial so you can really live with it and see if it’s right for you before paying. There are a million task-management apps. Unforgetful is not for everyone, but it’s really for me, far more than anything else has ever been. Frankly, I have no idea how to reach the other people it’s for. But I know you’re out there. If any of this resonates with you… give it a shot. Despite significant progress on my mental health around this from therapy and media, I haven’t (yet?) sought an official ADHD diagnosis because I haven’t sought medication, and that seemed like the main reason why I’d want a diagnosis. That’s probably worth reconsidering. I’ll make myself a reminder to do it. Someday. ↩︎ I saw a psychologist throughout high school for my homework problem. Rather than recognizing 7 of the 9 symptoms of what we now call “inattentive” ADHD, he was just one more adult condemning me for not caring. (I really did care. Nobody wanted me to be “better” more than me.) In the 1990s, if you didn’t do homework but weren’t hyperactive, you were obviously just choosing to be lazy, and the solution was apparently to apply more shame. Not all doctors are good. ↩︎ I’ve tried other apps that are beautiful and work differently, but they’re all complete task-management systems that introduce a lot of features and complexity that I neither need nor want, at the expense of Reminders’ ubiquitous integration that I highly value. I’ve also tried other apps that use the Reminders database, but I haven’t found any of them to be… good. (Sorry. I probably didn’t try yours.) ↩︎ At least they specify the actual snooze times now instead of vague descriptions like “the afternoon,” which I proudly take full credit for, since it happened to change only after I ranted about it relentlessly on our podcast for months. If I truly made this happen, it might be the greatest impact on the world I’ll ever have. ↩︎ Dictation just records every word you say as the title, which is extremely fast and reliable. It doesn’t yet recognize things like “Remind me to buy milk at 10 AM tomorrow.” I haven’t nailed that natural-language processing yet — coming soon, maybe! For now, Siri does that part better. ↩︎

14th Aug 2026 1 votes
A letter to John Ternus

As Apple celebrates its fiftieth birthday, we celebrate the spirit of its formation, when people who loved computers started making great computers to inspire more people to love computers. That spirit is difficult to find in the tech business today. Immense scale, soulless optimization, and an insatiable thirst for growth dominate its behavior and discourse, leaving little room for the spirit and principles embodied by Steve Jobs and Steve Wozniak. Apple still has this spirit, and I believe you do, too. But it’s not infinite or invincible. It’s under constant pressure, including from Apple itself. It seems likely that you’ll soon be leading Apple, which will place unfathomable responsibility on your shoulders. As you grow into the leader that we know you can be, I urge you, on behalf of everyone who loves computers as much as we do, to protect and cultivate this spirit of Apple’s founders as the company’s top priority: We love computers. We don’t hide that — we celebrate it! We use computers to enhance our minds, lives, and abilities — not to be controlled, restricted, tricked, placated, angered, or surveilled. Our computers work for us, with the utmost respect for our time, attention, money, data, and privacy. We are customers and owners — not resources to be harvested, annoyed, or badgered into ever more services and upsells. Apple leads the industry in these values, but leading doesn’t always mean excelling. Remaining true to these values requires constant diligence, honest evaluation, introspection, and the audacity and courage to effect change. Apple doesn’t settle for fine, functional, or good enough in its hardware (and thanks for your incredible work on that). We love making and using products that aren’t just great, but greater than they need to be, always raising the bar of greatness for its own sake. Software, services, revenue sources, and world impact need to be held to that same standard. Focus on making great computers with great user experiences above all else, and you can trust that every other major goal will follow: profit, market share, expansion, impact, and benefit to the world. Making great computers must remain Apple’s top responsibility, because if you don’t do it, nobody will.

1st Apr 2026 1 votes
Retreating to Safety

Ten years ago, Apple’s Phil Schiller surprised Apple enthusiasts and developers by walking out on stage at John Gruber’s The Talk Show Live WWDC event and giving an open, human, honest interview to a somewhat jaded community. I wrote this in response: Both Apple and Phil Schiller himself took a huge risk in doing this. That they agreed at all is a noteworthy gift to this community of long-time enthusiasts, many of whom have felt under-appreciated as the company has grown. […] Phil’s appearance on the show was warm, genuine, informative, and entertaining. It was human. And humanizing the company and its decisions, especially to developers — remember, developer relations is all under Phil — might be worth the PR risk. This started a ten-year run of interviews by Apple executives on The Talk Show every year at WWDC that proved to be great, surprisingly safe PR for Apple. No executive ever said something they shouldn’t have (they’re pros), no sensational or negative news stories ever resulted from them, and Apple’s enthusiastic fans and developers felt seen, heard, and appreciated. *     *     * For unspecified reasons, Apple has declined to participate this year, ending what had become a beloved tradition in our community — and I can’t help but suspect that it won’t come back. (A lot has changed in the meantime.) Maybe Apple has good reasons. Maybe not. We’ll see what their WWDC PR strategy looks like in a couple of weeks. In the absence of any other information, it’s easy to assume that Apple no longer wants its executives to be interviewed in a human, unscripted, unedited context that may contain hard questions, and that Apple no longer feels it necessary to show their appreciation to our community and developers in this way. I hope that’s either not the case, or it doesn’t stay the case for long. This will be the first WWDC I’m not attending since 2009 (excluding the remote 2020 one, of course). Given my realizations about my relationship with Apple and how they view developers, I’ve decided that it’s best for me to take a break this year, gain some perspective, and decide what my future relationship should look like. Maybe Apple’s leaders are doing that, too.

30th May 2025 38 votes
Ten years of Overcast: A new foundation

Today, on the tenth anniversary of Overcast 1.0, I’m happy to launch a complete rewrite and redesign of most of the iOS app, built to carry Overcast into the next decade — and hopefully beyond. Like podcasts better than blog posts? Listen to ATP #596 for more! What’s new Much faster, more responsive, more reliable, and more accessible. Modern design, optimized for easily-reached controls on today’s phone sizes. Improvements throughout, such as undoing large seeks, new playlist-priority options, easier navigation, and more. What’s not Most features. Overcast is still Overcast! The audio engine. It’s the best part of Overcast, and still leads the industry in sound quality, silence skipping, and volume normalization. (More soon!) The business. I’m still a one-person operation, with no funding or external ownership, serving only my customers. My principles. I always want to make the best podcast app, and I’ll never disrespect your time, attention, or privacy. What’s gone Streaming. Most big podcasts now use dynamic ad insertion, which causes bugs and problems for streaming playback.1 Downloading episodes completely before they begin playback is much more reliable. Tapping a non-downloading episode will now open the playback screen, download it, then start playback. It works similarly to the way streaming did before, but playback begins after the download completes, not after a portion of it is buffered. On today’s fast networks, this usually only takes a few extra seconds. And in the near future, I’ll be adding smarter options and more control over selective downloading of episodes to further improve the experience for people who don’t automatically download every episode. What’s next The last few missing features from the old app, such as Shortcuts support, storage management, and OPML. These are absent now, but will return soon. More options for downloading and deleting episodes. Upgrading the Apple Watch app to the new, faster sync engine. (The Watch app is currently unchanged from the previous one.) And, of course, more features, including some of your most-requested features over the last decade. Getting this rewrite out the door was a monumental task. Thank you for your patience as I work through this list! Why? Most of Overcast’s core code was 10 years old, which made it cumbersome or impossible to easily move with the times, adopt new iOS functionality, or add new features, especially as one person. That’s why there haven’t been many new features or changes in years. You saw it, and I saw it. I wasn’t able to serve my customers as well as I wanted. For Overcast to have a future, it needed a modern foundation for its second decade. I’ve spent the past 18 months rebuilding most of the app with Swift, SwiftUI, Blackbird, and modern Swift concurrency. Now, development is rapidly accelerating. I’m more responsive, iterating more quickly, and ultimately making the app much better. Thank you all so much for the first decade of Overcast. Here’s to the next one. Dynamic ad insertion (DAI) splices ads into each download, and no two downloads are guaranteed to have the same number or duration of ads. So, for example, if the first half of an episode downloads, then the download fails, and it downloads the second half with another request, the combined audio may jump forward or back at the halfway mark, losing or repeating content. ↩︎

16th Jul 2024 93 votes

More in programming

Abusing ID3 chapters to turn videos into glanceable podcasts

I listen to a lot of podcasts, and I like how they fit around other tasks. I press play, lock my phone, and put it down. I’m free to wash the dishes, fold the laundry, or shop for groceries. Unfortunately, more and more information is only published as a video. Technical talks, conference sessions, video essays – they don’t work in an audio-only podcast app. I could convert these videos to MP3 files, but that breaks down the moment a video isn’t pure spoken word. If a speaker says, “Look at this slide” or holds up a diagram, an audio-only file leaves me stranded. I don’t want to give up the podcast player I like, nor stare at a screen for an hour – but I do want the information in these videos. To solve this, I’m abusing my podcast player’s chapter support. This gives me the best of both worlds: I can listen to a video as audio-first, and glance at my lock screen if I need a moment of visual context. The idea: Chapters every few seconds MP3 files can have ID3 metadata, and ID3 metadata can include chapters. A chapter covers a particular time range, and it can have an associated title, description, and cover art. My podcast app of choice is Overcast, which can’t play videos, but it does have robust chapter support. I can jump between chapters, navigate a table of contents, and see per-chapter cover art. To get videos into Overcast, I’m creating MP3 files with a new chapter every few seconds, and the per-chapter cover art is a corresponding frame from the video. As I play the file, I get a slow, stop-motion-like rendition of the original video. If my phone is locked, I can glance at my lock screen and see the current frame in the Now Playing screen. Overcast is developed by Marco Arment, and I got this idea from Forecast, his app for adding chapters to podcasts. In particular, I was struck by its ability to create chapters that don’t display in the chapter list – ideal if I don’t want a table of contents with hundreds of entries. As I was developing my script, I compared my output to the output from Forecast to ensure I was creating the chapters correctly. The code: FFmpeg and Mutagen There are three steps in this process: Convert a video file to an MP3 Extract images from the video at a fixed interval Insert the images as hidden chapters in the MP3 file Let’s go through each in turn. 1. Convert a video file to an MP3 Converting a video file to an MP3 is a single FFmpeg command: ffmpeg -i video.mp4 audio.mp3 This is consistently the slowest step of the process, and I do wonder if I could use different settings or an alternative encoder to make it go faster – but it’s not slow enough to be worth further investigation. 2. Extract images from the video at a fixed interval Extracting images from a video needs a more complicated FFmpeg command: ffmpeg -i video.mp4 \ -vf 'fps=1/5,scale=iw*sar:ih,scale=min(iw\,945):min(ih\,945):force_original_aspect_ratio=decrease' \ thumbnail_%04d.jpg This extracts an image every 5 seconds, downscales any image larger than 945 pixels square (while preserving the original aspect ratio), and saves the results as sequentially numbered JPEG images (thumbnail_0001.png, thumbnail_0002.png, and so on). The key is the -vf flag, which defines two FFmpeg filters: The fps filter selects one frame every 5 seconds (fps=1/5). The first scale filter scales the width based on the sample aspect ratio (scale=iw*sar:ih). Without this filter, frames can be stretched and distorted. The second scale filter scales the input video, preserving the original aspect ratio (force_original_aspect_ratio=decrease), and ensuring the output images fit within 945×945px or the size of the input video, whichever is smaller. My limit is 945 pixels because that’s the largest size that cover art is shown on my iPhone. This filter still isn’t completely correct – it sometimes creates images from portrait videos that are smaller than I’m expecting – but it’s good enough. These are only thumbnails for glancing at, and if I want to change it later, I can always do the image resizing outside FFmpeg. 3. Insert the images as hidden chapters in the MP3 file Inserting the chapters into the MP3 file is more complicated. Although FFmpeg has basic support for ID3 metadata, as far as I know, it can’t insert chapters with per-chapter artwork. Instead, I’m going to reach for Python and the Mutagen library. Here’s the code to add a chapter to an MP3 file: from mutagen.id3 import APIC, CHAP, ID3, PictureType audio = ID3("audio.mp3") with open("thumbnail_0001.jpg", "rb") as f: img_data = f.read() image_frame = APIC(mime="image/jpeg", type=PictureType.OTHER, data=img_data) chapter_frame = CHAP( element_id="chp1", start_time=0, end_time=5 * 1000, sub_frames=[image_frame] ) audio.add(chapter_frame) audio.save() This creates a single chapter that lasts the first 5 seconds (0 to 5000 milliseconds), and the per-chapter cover art is thumbnail_0001.jpg. If we ran this in a loop, we could add images for every 5 second slice of the original video. This code is inserting two frames into the ID3 metadata: The CHAP (chapter) frame contains the timing information, and it can have subframes for metadata like title, chapter art, or associated URL. The APIC (attached picture) subframe contains information about a picture, which can either be a blob of image data or a URL to an image on the web. Normally, you’d also insert a CTOC frame which defines a table of contents, but I don’t want a TOC with hundreds of 5-second chapters, so I’m deliberately not doing this here. This is allowed by the ID3 spec – you’re not required to insert a CTOC frame if you’re using chapters, and you can have chapters that aren’t listed in your table of contents. To work out which frames I needed, I used Forecast to create some chapters by hand, and I inspected their frames. In particular, loading an MP3 and calling Mutagen’s pprint() method shows a human-readable list of frames, and then I could drill into the individual fields: from mutagen.id3 import ID3 audio = ID3("audio.mp3") print(audio.pprint()) I wrapped all this code in a project called glancecast, which allows you to convert a video file with a single command, with optional flags to set the frame length and chapter art size: $ python3 glancecast.py interesting_talk.mp4 interesting_talk.mp3 The process takes a minute or so to complete, most of which is spent transcoding the video file to MP3. The resulting MP3s are usually 40 to 50 MB in size, which is very reasonable. The outcome: How it looks in practice Here’s what one of these “glanceable” podcasts looks like in Overcast and on my lock screen: Maggie Appleton presented this talk over two years ago and it’s been on my “talks to watch” list ever since. Once I put it in Overcast? I listened to it in less than a day. It’s not a lot of extra information, but enough that I can quickly glance down and get the gist of what a speaker is saying. Both views update with a new frame every few seconds, or I can put my phone in my pocket and ignore the screen. I’ve used this approach for half a dozen videos so far, and I’m happy with the results. I expect to keep using it, because I have a long queue of videos I’ve been meaning to watch. If you’d like to try this, check out glancecast for the full code and instructions. [If the formatting of this post looks odd in your feed reader, visit the original article]

12 hours ago 1 votes
AI Isn’t Replacing Open Source

Andrew Baker, the current Group CIO at Capitec Bank wrote an interesting piece on AI and open source, and how these tools that generate code according to one’s specification may replace the general reliance on open source implementations done by contributors around the world. I’d really recommend reading it. I have great admiration and respectContinue reading "AI Isn’t Replacing Open Source"

19 hours ago 1 votes
Confessions of an Unrepentant Slop Snob

A framework for thinking about when AI involvement is additive or a violation

yesterday 1 votes
Planning with Agents: Divided Worlds, Boundary Objects, and Thicker Interfaces

Why we need richer, thicker interfaces and better boundary objects for collaborative planning with agents

yesterday 1 votes
Foundations of Agent Friendly Codebases

A look at 10 foundational pillars that enable agents to operate more competently and more efficiently in any codebase.

2 days ago 1 votes
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