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Buyer’s guide

How to choose an aquarium app: a practical checklist

There are plenty of aquarium apps and they differ in ways that only show up after a few weeks of use. This checklist helps you decide what matters for your tanks before you commit to one.

Updated 8 October 2026 · Written by the makers of TankSnap, so we say where we fit and where we do not

Do you need an app at all?

Not necessarily. A notebook or a spreadsheet works for one small tank and a keeper who is happy to write things down. An app earns its place when you have several tanks, forget to test, want to see trends in a chart, or find typing readings into a form so tedious that you stop doing it.

The checklist

1. How does data get in?

This is the question that decides whether you keep using the app. If every water test means typing five numbers into a form, you will skip it on busy weeks. Look at whether the app can read a test result from a photo, and whether you can correct what it reads.

2. Does it keep a history you can read?

Look for a timeline of tests, water changes, doses and additions per tank, plus charts of the parameters over time. A trend tells you more than any single reading.

3. Can it remind you?

Test days and water changes slip. Check that reminders can be set per tank, since a planted nano tank and a heavily stocked cichlid tank rarely share a schedule.

4. Does it handle more than one tank?

One tank is easy. If you have, or plan to have, several, check how the app lists them and how many it allows on its free plan.

5. Are units and language right for you?

Temperature in °C or °F, volume in litres or gallons, and numbers with a decimal comma or point should all follow your region without extra setup.

6. What does it ask of you?

Some apps need an account and an email address before you can log anything. Check what the privacy policy says it collects, whether there are ads, and whether the app tracks you across other services.

7. What does it cost, honestly?

Look at what the free plan includes, what the paid plan adds, and whether paid features are limits on tanks, on scans, or on advice. Subscriptions are fine when you can see what you get for them.

8. Can you get your data out?

Aquarium history is valuable. Ask whether it can be exported, and whether it survives a lost or replaced phone.

9. Does it give advice, and does it act on its own?

Automatic suggestions can be useful, but you should be the one who decides. Be wary of any app that changes your records or tells you to dose something without a clear way to check and override it. Good advice shows its uncertainty instead of sounding sure about everything.

Where TankSnap fits

TankSnap is built around the first point on the list. You photograph a test strip, a liquid kit result, a fish, a plant or a piece of equipment, and the app proposes what it saw. You review it and confirm. Nothing is saved without your OK, and typing is optional.

• Camera first. For API, JBL, AquaCare and Tetra test kits it compares the photo against the brand’s own colour scale. Other brands get a more general estimate.
• History and trends. Every test, water change and addition is a timestamped event, with parameter charts per tank.
• Reminders per tank, with separate test and water change intervals.
• No account, no ads. You start using it without signing up. Your data stays on your device.
• iPhone, iPad and Android. It is free to download. Some features, such as more AI scans and tanks, need a Pro subscription or scan packs.

It may not be the right choice if you prefer to type every value yourself in a spreadsheet-style app. In that case, the checklist above is the thing to take with you.