AquaAssist is a free aquarium tracker I've been building for the past couple months. What it does: - Logs pH, temperature, ammonia, nitrite, nitrate, KH/GH with trend charts - A guided nitrogen cycle assistant for new tanks — tracks the cycle and tells you when it's actually safe to add fish - A species database with compatibility checks, so you get a warning before adding something that clashes with your current tankmates - A CO2 estimator for planted tanks, from your pH/KH readings - Water change & feeding reminders, support for multiple tanks, optional photo logs Technical bits that might interest this crowd: it's a PWA, so it installs as a real app on both Android and iOS (via "Add to Home Screen" on iOS) — no app stores, no native codebase to maintain separately. Once loaded, it works fully offline. No account or login required; the only optional feature (cross-device sync) uses a short code instead of an email/password. It's free, no ads, and I'm still actively improving it — would love feedback, especially from anyone who actually keeps fish or plants. What's missing, what's confusing, what would make this genuinely useful day to day?

AquaAssist

Track water & cycle new tanks — free, offline, no signup

Track water & cycle new tanks — free, offline, no signup