It's been a good journey. Thank you so much to whoever keeps running this thread!

When Twitter killed off third-party apps, the browser extension I'd been developing ever since "New Twitter" launched in 2019 suddenly became one of the few ways to make Twitter more tolerable to use, and the number of users of the Chrome version tripled from 30k to 90k in a fortnight (mostly in Japan).

When they confirmed third-party apps had been killed on purpose and jacked up the price of the API to discourage new ones, I started selling it on the App Store the next week and it's made more than $500 per month ever since.

Before the end of the year I'm hoping to roll out a single paid subscription which works across all my extensions when you sign up for it, which enables syncing settings across all your browsers and devices, unlocks additional subscriber-only features, and will enable creation of extension-specific APIs if there are future features which require one. Between Control Panel for Twitter and https://soitis.dev/control-panel-for-youtube I have ~390,000 users, so, y'know, please like and subscribe.

That will _eventually_ include my free Hacker News extension ( https://soitis.dev/comments-owl-for-hacker-news ) so things like new comment counts, user notes and muted users can sync across every browser and device you use Hacker News on.

If that takes off, I hope to make the App Store versions free and figure out how to give anyone who bought it 3 months of the subscription per extension they bought as a thank-you. If anyone's done something like that before, I'd be happy to hear about it via any communication method in my HN profile!

I built ChatKeeper because I wanted to treat my ChatGPT history like a local knowledge base, with local-first access to my data.

It’s a command-line tool (GUI in progress) that takes a full ChatGPT .zip export and syncs it with local Markdown files. You can move and rename them freely and they will stay in sync on future runs.

It pairs well with tools like Obsidian and lets you link your own notes to specific conversations or even points within them.

Revenue is modest but growing month over month. It’s a one-time purchase, not a subscription.

Most users so far are researchers and other ChatGPT power users who already live in Markdown or want to do things like curate and compress the context of very long-running conversations.

This game was developed by my friends and I during college, then we Kickstarted a few years after.

Sales have dwindled since, but I still like the game. So much so that I turned it into a free web app. Still a WIP but it's maybe 75/80% there.

Play for free here, you will need to make an account: https://lastyearofcarbon.com

Buy a copy here, but you should play the game first to see if you like it: https://lyoc.shop

TheMapsGuy.com

Used it for: Skiing, hiking, cycling. Any outing with a route.

Import a route from Strava, RideWithGPS, GPX/FIT, Apple fitness. Plan for weather forecasting! Fitness readiness is obtained from metrics collected from a smart watch.

I actually turned it free recently. But barely reached over 400 MRR then started dropping. Consumer market is hard and I'm more interested in learning about AI and a full stack side project.

https://brezza.cc/

CoPlay is a platform for managing fleets of gaming consoles, users and subscriptions for pediatric hospitals. Think of it as an mdm for Xbox devices/users that does managed subscriptions

https://coplay.io/

Since I’ve been shifting more towards platform engineering work in my career, the best reward abut this side hustle isn’t the financial benefit, but is the opportunity to stay grounded in software dev. I love seeing the changing APIs each year with the new iOS updates. And the seasonal approach to doing updates is always fun too.

[0]: https://apps.apple.com/us/app/afi-explorer/id1564964107

Still in MVP mode - but it already made some sales.

What's different about it from similar solutions is the way you can get data from an Excel file (most other companies have the JSON and CSV figured out).

It supports Excel style addressing so it's pretty flexible on how you reach for the data inside a PowerPoint template (access every sheet, every cell, named range or table to use it in merging process).

People use it for various kinds of use-cases - creating certificates, automating pricing offers, delivering employee feedback forms, preparing market research presentations and even subtitles for a theatrical play.

https://apps.apple.com/us/app/standly-standing-desk-timer/id...