ReefDrift
See drift before it costs you coral. Log a test in seconds, get a Stable, Watch or Danger score for each tank, and see every parameter against your target range. No account, works offline.
What you get
Log and score
- Alkalinity, calcium, magnesium, nitrate, phosphate, pH, salinity, temperature, ammonia and nitrite
- Last values are pre-filled, so a full test set is quick
- Tank Stability Score: Stable, Watch or Danger, with extra weight on alkalinity, calcium and magnesium
- Out-of-range parameters are flagged on the dashboard
Charts and targets
- Line chart per parameter with your target range as a band
- Time windows from 7 days to all readings
- Units: dKH, meq/L, ppm, SG, ppt, Celsius and Fahrenheit
Dosing calculator
- Enter tank volume, current and target value
- Built-in products: BRS 2-Part, ESV B-Ionic, Red Sea Foundation, or your own custom product
- Estimates only: test again before you dose more
Routine
- Test and task reminders, scheduled on your device
- Maintenance log: water changes, filter media, ATO top-off, feeding, coral frag, equipment
- Several tanks: reef, FOWLR, freshwater, planted, nano and frag tanks
- Home screen widget on iPhone and Android
Your data
- Stored on your device, no account, no cloud
- CSV export per tank
- Light and dark theme, many languages
Private by design
No account and no sign-up. Your tanks, readings and logs are stored on your device, and we run no server that receives them. The app has no analytics or crash-reporting SDK.
The free version shows banner ads from Google AdMob, and Google may collect data such as your advertising ID for them. Where required you are asked for consent first, and on iPhone you choose whether to allow tracking. On iPhone, Pro removes the ads. See the privacy policy.
Free and Premium
Android: free, with banner ads. No purchase is offered and there is no tank limit.
iPhone: free with banner ads and a limit of 3 tanks. ReefDrift Pro removes the ads and the tank limit; choose a monthly or yearly subscription, or a one-time lifetime purchase. Prices are shown in the app and the store in your local currency. Subscriptions renew automatically; cancel any time in your Apple ID subscription settings.
Logging, the stability score, charts, dosing calculator, reminders and CSV export are free.
Questions
Do I need an account?
No. There is no registration and no login.
Does it work offline?
Yes. Everything works without internet. Only the ads need a connection.
Does it show ads?
Yes, in the free version, as a banner at the bottom of the main screens. On iPhone, Pro removes them.
How many tanks can I have?
Android: no limit. iPhone: 3 in the free version, unlimited with Pro.
How is the Tank Stability Score calculated?
Each parameter is compared with your target range. Alkalinity, calcium and magnesium count the most. The result is Stable, Watch or Danger.
Is the dosing calculator safe to follow blindly?
No. It gives an estimate from your tank volume and readings. Dose in small steps, retest, and follow the product maker's instructions.
Can I export my data?
Yes. Export a tank's readings as a CSV file.
Can I sync between devices?
No. There is no cloud sync. Data stays on the device.
Which devices are supported?
iPhone and Android phones.