Ask HN: What apps have you created for your own use?

I was spending too much time creating Anki flashcards from books in French (learning Fr for some time) so I created a simple ebook reader that automated all that plus using GPT api for context and explanations(basically what I am sometimes using ChatGPT for). Decided to release it last week and now it has about 80-100 users. https://apps.apple.com/bg/app/lexic/id6473446321

A soccer tracking app for who is playing and who isn't and what positions.[^1] A weight tracking application.[^2] A time tracker for how many hours my daughter was driving.[^3] An app to help my wife randomly pick meals for the upcoming week.[^4] Logic (CLI) to organize finances with hledger. A back end to work with all my offline-first web apps (the first 3 apps).[^5]

[^1]: https://github.com/jon49/Soccer

[^2]: https://github.com/jon49/WeightTracker

[^3]: https://github.com/jon49/drive-time-tracking

[^4]: https://github.com/jon49/MealPlanner

[^5]: https://github.com/jon49/Imagebase

Once I moved to the US I understood that tip culture here is so different than in other parts of the world. So, to get rid of confusion, I created this project. Just add your bill amount and think about how you liked the experience at this place, and the app will help you to calculate tips. Easy.

https://kaplich.me/howmuchtotip

I'm in the process of creating a web gallery for my Digikam [0] photo collection. The workflow is:

1. I organize all my photos in my computer, with albums, tags, faces, geolocation, etc.

2. The photos and the Digikam DB (SQLite) get replicated to my home server (using Syncthing, but anything would work).

3. Changes are automatically visible in the running webapp. I can access it anywhere, especially useful on mobile while away.

I have an MVP almost done, just had trouble with Digikam's thumbnails because they use an extremely obscure image format, PGF [1]. I wrote a WebAssembly version using emscripten that I called webpgf [2] and am now in the process of integrating with the web gallery. However I'm concerned about CPU and RAM use in the browser, so I will probably have to end up reencoding the thumbnails in the backend.

I will make a public announcement once the project is officially launched. It will be a bit crude at first, as it'd made to scratch my own itch, but I hope it will be useful to more people.

[0] https://www.digikam.org/

[1] https://en.m.wikipedia.org/wiki/Progressive_Graphics_File

[2] https://github.com/haplo/webpgf/

I used cloudflare to create a service that regularly converts the notion database into json and synchronizes it to my Github project warehouse, so that I can use notion to manage the information on the static website, and it also has very good speed and SEO.