Fellow ASO folks — I've been frustrated for a while that the good tooling (Sensor Tower, Appfigures, AppTweak) starts at $500/mo, and the free tiers of everything else hide the features that actually matter.
So I built my own and open-sourced it. Sharing here in case it's useful.
It's called AppStoreCat. Free, MIT licensed, hosted demo at https://appstore.cat.
What's in it that's relevant to this sub:
* 🔤 Keyword density — 1/2/3-gram n-gram analysis with stop-word filtering across 50 languages. Cross-app comparison so you can see which keywords a competitor is over- or under-indexed on. * 🌍 Multi-locale store listing tracking — every locale, every country, for any app. Title, description, screenshots, metadata. * 🔔 Change detection — when a competitor updates their title or adds a locale, the diff is captured automatically. * 📊 Trending charts — daily top-free / paid / grossing per country, both stores. Historical rank data, not just today's number. * ⭐ Rating trends — per-country over time.
Use cases I've personally gotten value from:
- Watching a direct competitor's title updates in near-real-time
- Building keyword lists by scraping n-grams from top 10 apps in a category
- Tracking when competitors add / drop locales (tells you where they're investing)
- Spotting when a competitor copies your listing changes (yes, this happens)
Repo: https://github.com/appstorecat/appstorecat Demo: https://appstore.cat
Happy to answer ASO-specific questions below — especially around keyword methodology or how I'm handling locale fallbacks. It's a beta, so feedback on what's missing vs. what you use daily in paid tools is exactly what I need.