Support

An iPhone running iOS 26 or later, which means iPhone 11 or newer. Reefwell is built for iPhone.

No. There’s nothing to sign up for. If you want sync, Reefwell uses the iCloud account already on your iPhone.

Yes. Logging is free and never capped, and so are charts, the journal, core alerts, reminders, iCloud sync, backups, and CSV export. Reefwell Pro is optional and adds more than 2 tanks, widgets, advanced alert rules, and themes.

Tap Log Test on the Dashboard or Trends tab. Enter values for any parameters you tested, skip the rest, and tap Save. You can log a whole round of tests on one screen.

Yes. In the Log Test sheet, tap the date and time at the top and change it before saving.

Alkalinity, calcium, magnesium, nitrate, phosphate, salinity, temperature, and pH are built in. You can add your own parameters with your own unit label, and turn any parameter on or off for each tank.

Yes. Alkalinity can show in dKH, meq/L, or ppm; salinity in ppt or specific gravity; temperature in °F or °C; and concentrations in ppm or ppb. Changing a unit only changes how values are shown. Your logged values aren’t altered.

Each parameter has a target range you can edit in Settings ▸ Parameters & Targets. The built-in ranges are typical starting points, not advice, so adjust them to your tank. Each reading then shows whether it’s in range, slightly off, or out of range, with a label and symbol as well as a color.

Open the parameter’s chart and swipe on a reading in the list to edit or delete it. Deleted items stay in Settings ▸ Recently Deleted for 30 days in case you change your mind.

You can get alerted when a reading is out of your range, when a test is overdue, and with a nudge to retest after an off reading. Set them up in the Tasks tab. Reefwell Pro adds advanced alert rules.

Create reminders in the Tasks tab for things like water changes, testing, or maintenance. They can repeat every few days, on chosen weekdays, or monthly. When you complete a water-change reminder, Reefwell can add it to your journal.

Check iOS Settings ▸ Notifications ▸ Reefwell and make sure notifications are allowed. Focus modes can also hold notifications back. Opening Reefwell refreshes its scheduled reminders.

Widgets are part of Reefwell Pro. Touch and hold an empty spot on your Home Screen, tap Edit, then Add Widget, and choose Reefwell. You can also add one to your Lock Screen by touching and holding the Lock Screen and tapping Customize.

When you’re signed in to iCloud, Reefwell syncs your data through your private iCloud account, so it shows up on your other devices. You can check the status in Settings ▸ iCloud Sync. Reefwell works fully offline and syncs when you’re back online. Changes can take a few minutes to appear on another device.

• Make sure you’re signed in to the same Apple Account on each device.
• Check that iCloud is turned on for Reefwell in iOS Settings, and that your iCloud storage isn’t full.
• Open Reefwell on both devices while connected to the internet, and give it a few minutes.

Yes. Reefwell keeps automatic backups on your device. You can also export a backup file from Settings ▸ Backup & Export and save it somewhere safe, like Files or iCloud Drive. Automatic backups stay on the device, so if you delete the app, export a copy first.

Go to Settings ▸ Backup & Export and choose a backup. You can merge it with what’s already in the app, or replace everything (Reefwell asks you to confirm first).

Always. CSV export is free and works whether or not you have Pro. You can open the file in Numbers, Excel, or Google Sheets. Reefwell can also import CSV files, with a preview before anything is added and an option to undo the import.

If iCloud sync is on, sign in with the same Apple Account and your data will sync over. If not, export a backup on your old iPhone, then restore it on the new one.

Delete items in the app, and they’re removed for good after 30 days in Recently Deleted. To remove everything from a device, delete the app. To also remove your iCloud copy, open iOS Settings, tap your name, then iCloud, and manage your storage to delete Reefwell’s data. See the Privacy Policy for details.

No. There are no accounts, ads, analytics, or tracking, and your data never comes to us. Read the Privacy Policy.

On a new device or after reinstalling, open the Reefwell Pro screen in Settings and tap Restore Purchases. Make sure you’re signed in with the Apple Account you used to buy it.

Nothing is locked or deleted. All your tanks stay viewable, loggable, and exportable. You just can’t add tanks beyond the free limit or use Pro-only features.

Subscriptions are managed by Apple. Cancel in iOS Settings ▸ your name ▸ Subscriptions. For refunds, use Apple’s Report a Problem page.