HydraTag guides: the free water tracker app and the included NFC sticker
Practical guides to HydraTag. The first group covers the free Android app, which needs no sticker. The second covers the NFC sticker that will come free with the HydraTag Pro app upgrade, and how it will be delivered. iPhone support is not confirmed.
New to the app? Start with using the free app. Wondering what Pro changes? Read free vs Pro. The free app is on Google Play.
Using the free HydraTag app
Everything here is free in the current Android app on Google Play, and manual logging, quick add, reminders, history and units stay free in the forthcoming release. No sticker is needed for any of it.
- How to use the HydraTag water tracker app on AndroidFirst-use guide to the free HydraTag water tracker app for Android: set a goal and units, log your first drink, adjust quick-add amounts, and decide about reminders or a sticker.
- HydraTag free app vs HydraTag Pro: what stays freeManual logging, reminders, history and units stay free in HydraTag. NFC sticker logging is free today but moves to the planned US$9.99 one-time Pro upgrade, with one free sticker included.
- Water reminders in the HydraTag app: schedules and phone permissionsSet up drink-water reminders in the free HydraTag Android app: choose 3, 4 or 6 reminders a day, pause them after your first drink, and fix blocked notifications.
- Track water without an NFC sticker: manual logging in HydraTagYou do not need an NFC sticker to use HydraTag. Log drinks with the quick-add buttons or a typed amount, set bottle-sized presets, log partial bottles and undo mistakes.
- Review and correct your water intake history in HydraTagHow the History tab in the free HydraTag app shows 7-day, 30-day and yearly totals, goal days and daily averages, and how to remove a drink you logged by mistake.
- Millilitres or US fluid ounces: choosing water units in HydraTagHydraTag shows water in millilitres or US fluid ounces. How the app converts and rounds, common bottle sizes in both units, the ranges it accepts, and why your goal is personal.
- Build a daily water-logging routine with HydraTagPractical examples for a steady water-logging habit with the free HydraTag app: anchor drinks to moments you already have, use presets and reminders, and review weekly.
- HydraTag water tracker privacy: your data stays on your phoneWhat the free HydraTag Android app stores, which permissions it uses (NFC and notifications), what it never sends, and how to delete your water history.
The included NFC sticker and delivery
The NFC sticker comes free with the planned HydraTag Pro app upgrade. It is not sold on its own, and claims are not open yet.
- How an NFC sticker logs a drink in the HydraTag appSet the amount per tap, write it to the sticker once, then tap your Android phone after each drink. What the HydraTag app saves, when it asks you to confirm, and what to do when a tap fails.
- Standard or On-metal NFC sticker: which fits your bottle?The sticker included with the planned HydraTag Pro upgrade comes in two versions. Choose Standard for plastic or glass and On-metal for steel, and learn what ferrite backing does.
- HydraTag phone compatibility and bottle careWhat is confirmed and what is still being tested for the HydraTag Android app, NFC-enabled phones, the included Standard and On-metal stickers, bottle washing and adhesion.
- Included sticker delivery and order status: Canada and USAHow the free NFC sticker included with HydraTag Pro will ship from British Columbia to Canada and the USA. Shipping prices, delivery services and final terms are not yet confirmed.
HydraTag guide ยท Updated October 2, 2026