Penalty Bench

Penalty Bench turns a water test into a decision.

Two questions run every reef and freshwater keeper's day: is this number actually safe for my tank type, and how much do I dose right now? Aqua Bench answers both, entirely on your device.

This is not another blank logbook. Every reading you enter produces a calculated action plan.

GUIDED TEST SESSIONS
Pick the test kit, log the reagent lot number and expiry, then enter the result in dKH, meq/L, ppm, ppt or S.G. Record the sample temperature and the app converts and normalises the value before it is stored. No mental arithmetic, no spreadsheet.

CORRECTED, COMPARABLE NUMBERS
Refractometer and hydrometer readings are converted to a reference temperature, true salinity is compared against your target, and you get a plain answer: top off with fresh RO/DI, or correct with saltwater.

SAFE BANDS BY TANK TYPE
Multi-tank profiles hold display volume, sump volume, tank type (mixed reef, SPS, fish-only, planted, cichlid, shrimp), salinity target, temperature and per-parameter safe bands seeded from a bundled reference set.

DOSE BENCH
Two-part and Balling maths, magnesium correction, kalkwasser saturation potency, daily alkalinity demand and evaporation top-off reservoir sizing, all on one screen in millilitres.

WATER-CHANGE PLANNER
Dual sliders solve the change: what percentage brings nitrate or phosphate from where it is to where you want it, plus the pre-mix salt weight and mixing time for that volume.

TRENDS THAT WARN YOU FIRST
Per-parameter charts with 7-day and 30-day rolling averages, drift arrows, a volatility score and automatic out-of-band flagging with a plain-language explanation card, so you see drift before livestock shows stress.

INVENTORY AND SCHEDULE
Bottle volume, concentration, cost per dose, doses remaining and expiry countdown, with running-low reminders. Adaptive test and dosing reminders build a next-due queue, with snooze, skip-with-reason and threshold-triggered alerts when a logged value lands outside its band.

GLANCE WIDGET
Alkalinity, calcium and temperature on your home screen with band status colouring, last-tested timestamp and a one-tap jump into the log wizard.

REFERENCE LIBRARY
40+ interpretation cards covering precipitation and alkalinity suppression, ionic imbalance, salinity creep, nutrient export and new-tank cycling, each tied to the logged parameters that triggered it.

YOUR DATA STAYS YOURS
No account, no server, no ads, no analytics. Full JSON and CSV export and import to device storage, an in-app privacy screen, and one-tap delete-all-data.

Built for mixed-reef hobbyists chasing stable alkalinity, nano-tank owners, planted-tank aquascapers, shrimp and cichlid keepers, and club members who mentor beginners. Premium Compose UI with parameter dial gauges, trend ribbons, editable seed tanks and a demo tank pre-loaded so every screen is populated on first launch.

Offline-first. Everything computed on-device.