HydraTag Pro: App Upgrade with One Free NFC Sticker

Yes. The current HydraTag app for Android is free on Google Play and needs no account. Manual logging, quick-add amounts, reminders, history and unit choice are free and stay free in the forthcoming release. In the current app version (0.1.10), NFC sticker setup and tap logging are free. In the forthcoming release, NFC tap logging and sticker setup will require HydraTag Pro, an optional one-time upgrade that is coming soon. What stays free and what Pro adds

No. You can log every drink by hand with the quick-add buttons or by typing an amount, and that stays free. An NFC sticker is a shortcut: tap your phone to it after a drink and the app saves the amount you set up. The sticker does not measure water. In the current app version (0.1.10), NFC sticker setup and tap logging are free. In the forthcoming release, NFC tap logging and sticker setup, reading and writing will require an active HydraTag Pro upgrade; manual logging, quick add, reminders, history and unit choice stay free. Track water without a sticker

In the app, choose the amount each tap should log and write it to the sticker once. After you drink, hold the back of your NFC-enabled Android phone against the sticker. The app saves that amount and shows a confirmation with Undo. You log the drink; the sticker does not measure it. In the current app version (0.1.10), NFC sticker setup and tap logging are free. In the forthcoming release, NFC tap logging and sticker setup, reading and writing will require an active HydraTag Pro upgrade; manual logging, quick add, reminders, history and unit choice stay free. Compatible third-party NFC stickers may work for Pro users, but a sticker never unlocks Pro: Pro is verified through your upgrade, not through the sticker. How sticker logging works

Turn on Remind me to drink water in Settings, pick three, four or six reminders a day, and allow notifications when your phone asks. Reminders can pause for the rest of the day once you log your first drink. Set up reminders

Yes. Choose Millilitres or US fl oz in Settings. Every drink is stored in millilitres and shown in the unit you pick, so switching units later does not change your history. Millilitres vs US fluid ounces

Yes. Tap Undo right after logging, or open History, select the day and remove the entry with the cross beside it. Removal cannot be undone, so log the correct amount again if you need to. History shows 7-day, 30-day and yearly views with your goal days. Review and correct your history

On your phone. The current free app has no account, no cloud sync and sends no analytics events. You can clear today or delete all history in Settings, and uninstalling the app removes its data. The forthcoming Pro upgrade will need account verification to confirm your purchase, and a shipping address to deliver the included sticker; the free app will still need no account. Read the privacy guide

HydraTag Pro is a planned one-time upgrade for the app: US$9.99 once as a Google Play in-app purchase, with one free NFC sticker included. In the forthcoming release, NFC tap logging and sticker setup, reading and writing will require an active HydraTag Pro upgrade; manual logging, quick add, reminders, history and unit choice stay free. After purchase you will claim the included sticker from inside the app (or from a purchase-linked page the app opens). You pay shipping separately; that is disclosed before you buy Pro, and the actual shipping total with applicable tax is shown before you pay it. Sticker delivery will launch in Canada and the USA. Pro purchases and sticker claims are not open yet. The current free app remains available on Google Play. See the Pro offer

Choose Standard for non-metal plastic or glass surfaces. Choose On-metal for steel or other metal bottles: its ferrite backing helps shield the NFC antenna from metal interference. On-metal describes the backing, not a decorative metallic finish. Final bottle and adhesive compatibility is being tested. Choose the right sticker

The free app is on Google Play for Android; check the listing for availability on your device. Logging with a sticker needs an NFC-enabled phone, while manual logging needs no NFC at all. A tested sticker compatibility list will be published before Pro opens. iPhone support is not yet confirmed. Compatibility and care status

Sticker delivery will launch in Canada and the USA, with dispatch from the Lower Mainland in British Columbia. Shipping prices, delivery services and delivery estimates will be published before purchases open. You pay shipping; the charge and applicable tax are shown before payment. Delivery and order status

Care instructions will be published after testing. Neither sticker version is confirmed dishwasher-safe or suitable for soaking. Supplier water-resistance specifications do not establish durability under repeated bottle washing.