Reactiveworks Blog accompanies the apps released by SiU Ahn (안시우), an independent mobile developer based in South Korea. It is a one-person studio: I design, build, ship, and support the apps myself.
What this blog is
I release small, focused apps on Google Play and the App Store — a catalogue of narrow tools rather than a single flagship product. Each release gets a post here, covering what a store listing has no room for:
- Why the app exists. The problem it was built around, and who it is for.
- How it works. What the app actually does, feature by feature.
- What changed. When a version adds or fixes something worth explaining, that gets its own post.
Posts are filed under iOS, 안드로이드 (Android), and a general Blog category. If you arrived from a store listing, the post for that app is the one written about it.
The apps
The range is deliberately wide — bus timetables, neighbourhood bakery maps, savings trackers, vocal pitch training, lottery statistics — because the model here is “many small tools” rather than one large product. Most are free and supported by advertising.
Editorial policy
Every app covered here is my own, so treat these posts as a developer describing their own work, not as independent reviews. I do not accept paid placements, sponsored posts, or affiliate arrangements for third-party products, and I do not write about other people’s apps in exchange for anything.
Posts are written about my own releases, drawing on each app’s store listing and change history. Nothing here is republished or scraped from another site.
If the site displays advertising, those ads are served by third parties and are not endorsements. See the Privacy Policy for how advertising and cookies are handled.
Elsewhere
- Studio site: reactiveworks.dev
- Questions, bug reports, or corrections: Contact