Free tools
No sign-up, no store keys. Built on the same engine as Starquill.
App Store release check
Paste an App Store link: see if the latest version is rated worse than earlier ones, and what users complain about.
Review reply generator
Paste a review in any language and get a short, human reply in the same language.
App rating calculator
How many 5★ ratings to reach 4.5, and how few 1★ ratings it takes to fall.