26 tools · free · no sign-up

Small, private tools that do one thing well.

Free web apps for niche hobbies and workflows. Each runs entirely in your browser — no account, no tracking, no upload. Your data stays on your device.

100% offline-capable No account Nothing uploaded Works on your phone

Aquariums & fishkeeping

Reef tank water parameters & dosing tracker — alk, cal, mag with out-of-range flags.

Freshwater planted aquarium log — tests, fertilizer dosing & maintenance.

Animals & homestead

Beekeeping hive inspection log — queen, brood, stores, varroa, with due reminders.

Backyard chicken flock & daily egg log, plus health & worming records.

Goat & sheep herd records — health, breeding, auto kidding/lambing due dates.

Reptile & amphibian husbandry log — feedings, sheds, weights, temps.

Plants

Per-tree bonsai care log — water, feed, repot, wire — with seasonal reminders.

Orchid collection care log — watering, feeding, repotting & bloom history.

Food, drink & ferments

Homebrew batch log — gravity readings auto-calc ABV & attenuation.

Fermentation log — kombucha, kimchi, kraut, hot sauce, with ready-date estimates.

Starter feedings & bake log with a built-in hydration calculator.

Home coffee roasting log — weight-loss %, first crack, development ratio.

Mushroom grow log — colonization, flushes, yield in grams, contam tracking.

Whisky tasting journal & collection tracker with 100-point scoring.

Humidor RH tracking, cigar collection & tasting notes.

Workshop & maker

Board-foot & cut-list calculator for woodworkers, with project cost.

Pottery kiln firing log — cone/temp schedules, atmosphere, glaze results.

3D print log & filament inventory — settings, success rate, spool cost.

Soap & candle batch log — recipe, lye, superfat, cure-ready countdown.

Drone flight log & LiPo battery cycle tracker — clean FAA-style logbook.

Productivity & creative

ADHD-friendly focus timer & one-task-at-a-time planner for time blindness.

Lesson & student tracker for music teachers and tutors — who owes what.

Submission & query tracker for writers — what's out, response times, accept rate.

Turn one post into a week of content for every platform — your AI key, your data.

Private PDF toolkit — merge, split, rotate, convert, watermark, 100% in-browser.

Capture, annotate & redact screenshots before sharing — nothing leaves your browser.

Why these are different

Most "free" hobby apps want an account, sell your data, or nag you to subscribe. These don't. Every tool here is a single page that runs on your device — your records live in your browser's local storage, not on someone's server. No login, no email, no analytics following you around.

Each tool is free to use fully. A few have an optional one-time Pro unlock ($9) for power features like CSV export and stats — paid once, in crypto, no subscription. That's it.