Get help with PlainWater — an offline water-safety app.
PlainWater is an offline-first water-safety app for iOS and Android. It helps you find, test, and make water safe to drink, and recognize and treat basic waterborne illness — purification methods, dosing calculators, illness triage, storage guidance, region-specific risk reference, and more, organized into 8 modules covering 82 features. It works with no signal, is privacy-first with no account and no tracking, and offers a generous free tier alongside optional premium packs. PlainWater is live now on Google Play, with the App Store version currently in review.
Yes on Android — download PlainWater on Google Play now. The iOS version has been submitted and is currently in review with the App Store — check back here for the download link once it's approved.
Yes — that's the point. PlainWater's core guidance, calculators, and reference content are designed to work fully offline, because the moments water safety matters most are often the moments a boil-water advisory, a disaster, or simply being off-grid has already cut off your signal.
Yes. PlainWater is designed local-first, with no account required and no tracking. See our Privacy Policy for full details, including how in-app purchases are handled by Apple/Google.
No. PlainWater provides educational guidance, not diagnosis or certification. Any visual or camera-based comparison feature is for reference only — it never claims to certify that a water sample is safe. When in doubt, PlainWater's guidance always errs toward treating or boiling water, and toward seeking professional medical care for symptoms of illness.
PlainWater's free tier covers the life-critical layer: illness recognition and treatment, core purification methods (boiling, chemical treatment, dosing calculators, solar disinfection), emergency sourcing and storage, disaster-specific guidance (flood, hurricane, earthquake, wildfire, chemical spill), and accessibility/multi-language content. Premium packs add depth for people who already have some resources on hand — test-kit and meter interpretation, advanced/DIY purification builds, homeowner system maintenance, and enthusiast guides for camping, travel, and NGO water-testing coordination. You can unlock premium content with a one-time purchase (so it keeps working offline forever once bought) or, if you'd rather not pay all at once, a monthly or yearly subscription that unlocks exactly the same content — whichever fits how you'd rather pay.
No. PlainWater is built to work when everything else has failed, and that doesn't change if you choose the subscription option. Your device caches your entitlement locally the same way it does for a one-time purchase, and the App Store or Google Play — not any server PlainWater operates — handles renewal in the background. PlainWater itself still runs no server of any kind, for either payment path. Disaster-triggered guidance stays free for everyone regardless of purchase status, either way.
Multi-language, offline-available content is part of PlainWater's free tier by design, since the populations who need water-safety guidance most are often non-English speakers. Specific launch languages will be confirmed closer to release.
The core app and its free-tier features are free, with no ads. Optional one-time purchases unlock additional depth for users who want it.
Try these steps:
1. Force-close and reopen the app.
2. Restart your device.
3. Make sure you are running the latest version once PlainWater is available on the App Store or Google Play.
4. If the issue persists, contact us (see below) with your device model, OS version, and a description of the problem.
iOS: submitted, currently in App Review. Android: submitted, currently in review with Google Play. No download links are live yet — check back here once review completes on either store.
Bug reports, feature requests, or questions about the app. We read every message and respond as quickly as possible.
Business, partnership, or general inquiries about PlainWater.
Disclaimer: PlainWater provides water-safety information for educational purposes only and is guidance, not diagnosis or certification. It does not replace a professional water test or professional medical care. If you think your water may be unsafe, when in doubt, treat or boil it. If you are experiencing a medical emergency, contact your local emergency services immediately.