PlainWater - Water Safety
Water safety, offline, cited
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Purify, test, store, and treat waterborne illness — 82 features, cited to WHO/CDC/EPA, 100% on-device. No servers, ever. Free tier covers every life-critical feature.
Water is the most basic thing every human — and every animal — needs after oxygen. Yet the expertise to find, test, and make water safe to drink is normally locked behind labs, NGOs, and public-health departments. PlainWater puts it directly in your pocket, offline — because the roughly 2 billion people who need it most often have no signal and no money for a lab test, and even in wealthy countries, boil-water advisories and disasters knock out safe water routinely.
82 features across 8 modules, entirely on-device:
• PURIFICATION — boiling (altitude-adjusted), bleach/chlorine dosing calculator, purification tablets, SODIS, filtration, distillation, DIY builds (biosand, ceramic pot), and more — every method with exact, sourced numbers, not rules of thumb.
• ILLNESS & REHYDRATION — symptom guides for cholera, giardia, dysentery, typhoid; a red-flag triage that tells you when to seek help now; a home ORS (oral rehydration) calculator using the WHO-standard ratio; age-specific guidance for infants, children, elderly, and immunocompromised people.
• EVERYDAY HEALTH — how much water you actually need day to day, overhydration risk, mild dehydration's effect on mood and focus, pet and animal water hazards (blue-green algae is often fatal to dogs within hours), recreational swimming safety.
• TEST KIT & METER INTERPRETATION — turn a strip, meter, or kit color into a decision.
• SOURCING & STORAGE — emergency water sourcing, storage best practices, well and rainwater safety, a water-needs calculator, a disaster-kit rotation reminder.
• REGION & DISASTER GUIDANCE — boil-water-advisory checklists, an interactive "is my tap water safe" decision tree, flood/earthquake/hurricane/wildfire-specific guidance (free on principle — you need this most exactly when you can least afford to pay for it).
• ACCESSIBILITY — full-text search, audio read-aloud, icon-first mode for low-literacy users, screen-reader support, color-reference swatches, offline water-point mapping with saved pins, PDF export for a physical go-bag backup.
Every guidance claim is cited to a free, public, authoritative source — WHO, CDC, EPA, USGS, Ready.gov/FEMA, the American Red Cross, UNICEF/WHO's Joint Monitoring Programme, and CAWST. Tap any citation to read the source yourself. No paywalled journals, no commercial or vendor sources — ever.
100% ON-DEVICE, ALWAYS:
• No accounts. No servers, ever — not now, not as a future paid tier.
• Optional sync of your own data (a saved plan, reminders) uses only your device's own iCloud — never a company-run server.
• No ads. No tracking.
A generous free tier covers every life-critical feature, permanently — illness recognition, core purification methods, emergency sourcing, and all disaster-triggered guidance. Deeper, enthusiast, and homeowner-convenience content unlocks with a one-time "PlainWater Pro" purchase, smaller à la carte packs, or — if you'd rather not pay all at once — a monthly or yearly subscription that unlocks exactly the same content. Both options are handled entirely by Apple's StoreKit; PlainWater itself runs no server of any kind, for either payment path.
PlainWater provides educational guidance, not diagnosis or water-testing certification. When in doubt, it always tells you to treat or boil — and to seek professional medical care for symptoms of illness.
Terms of Use (EULA): https://equalinformation.com/terms-plainwater.html
Apple EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
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The developer, Bhim Upadhyaya, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Bhim Upadhyaya
- Size
- 2.7 MB
- Category
- Medical
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
16+
- 16+
- Frequent
Medical Treatment information
Contains
Health or Wellness Topics
- In-App Purchases
Yes
- PlainWater Unlimited (Yearly) $19.99
- PlainWater Unlimited (Monthly) $2.99
- Traveler & Scenario Pack $2.99
- Advanced Purification Pack $2.99
- Test Kit Reader Pack $2.99
- Homeowner & Reference Pack $2.99
- PlainWater Pro $9.99
- Copyright
- © 2026 EqualInformation, LLC