Crabitat: Hermit Crab Care

About Crabitat: Hermit Crab Care

🦀 Crabitat is a hermit crab care reference that also keeps your log.

Most tracking apps are a log with a few tips bolted on. This one is the other way round: the care information came first, and the tracking is there because you open the app daily anyway.

🍓 FOOD DATABASE

Search by name and get an answer. Every entry says safe, caution or avoid — three states, not two, because keepers genuinely disagree about some foods and pretending otherwise helps nobody. Where sources differ, Crabitat says so and names both. Each entry covers how much and how often, with the source named.

Search knows the other names for things, so cilantro finds coriander and prawn finds shrimp. There is a separate ingredient watchlist for reading labels, because a database of foods cannot tell you what is inside a bag of commercial pellets.

🚨 EMERGENCIES

Its own tab, works offline, and free forever — no purchase, no account, no exceptions. Search it the way you would say it: "can't find my crab", "he came out without a shell". Short steps, plain language, what to do first and what not to do.

Covers naked crab, emergency energy mix, isolating a crab, digging up a molter, flooding, mold, condensation, humidity too high, grain mites, fungus gnats, ants, cockroaches, moving crabs, and keeping the tank warm through a power cut. There is also a page on what is NOT an emergency — the one that saves the most crabs.

📐 FOUR CALCULATORS, ALL FREE

🏠 Tank size — count your crabs, get the minimum size and the nearest standard tank.
🪣 Substrate — bags of play sand, coir bricks, and how much you need for a proper depth.
🐚 Shell size — enter a caliper measurement in decimals or in sixteenths and get the opening range to shop for, adjusted for D-shaped and oval shells.
💧 Hygrometer calibration — the 24-hour salt test, guided, and the offset is then applied to every humidity reading you log. Nobody else does this one, and it quietly makes every later reading right.

📋 DAILY TRACKING

Home answers "what needs doing today" before anything else — overdue first, then due today, then what happened recently. Logging is one tap.

Feeding is not a text box. You pick from the food database, so Crabitat can show you what has and has not come up lately. Save a combination you feed often and reuse it in a tap.

🌙 MOLTING

Log the day they went down and Crabitat holds a clear "this is normal, do not dig" state. There is no countdown and no progress bar, on purpose: a big crab can be under for a year, and a bar counting down to a made-up date is how molting crabs get dug up.

⏰ REMINDERS

Feeding, fresh water, salt water, substrate, temperature and humidity checks. Set per tank, at the times you choose. They stay at the time you picked through daylight saving and they come back after a restart.

🤝 SHARED CARE

Going away? Send someone a code. They see what is due, they can log what they do, and every entry records who made it. They cannot change your settings or delete anything, and you can remove their access whenever you like.

✅ FREE, AND WHAT IS NOT

No ads. Not ever, and not in a paid tier either.

Free forever: the entire care reference, the whole food database, every emergency page, all four calculators, the setup checklist, the ingredient watchlist, one tank with as many crabs as you keep, and logging with the last 30 days of history.

Crabitat Pro is a single purchase — not a subscription — and adds unlimited tanks, your full log history, temperature and humidity graphs, shared care, saved food mixes, the feeding calendar, data export, and more than five reminders.

📚 ABOUT THE CARE INFORMATION

It comes from documents shared in a hermit crab keeping group, restated in Crabitat's own words with the source named on every screen. Where the group's files and other sources disagree, the app shows you both rather than quietly picking one.

Made by someone who owns a tank. 🦀