HydroGuard – Weather Hydration

Most hydration apps tell everyone to drink eight glasses. Hydroguard does the actual math. A 180 lb moderately active person at 65°F sea level needs roughly 108 oz of fluid. The same person under 105°F Tucson sun needs around 146 oz. Hydroguard pulls your current temperature, humidity, and elevation from MET Norway and adjusts your daily target accordingly. Log what you drink with three taps. Watch the ring fill. That's the whole app. WHAT'S DIFFERENT • Weather-aware target — not a generic "8 glasses" guess. Heat, humidity, and altitude all change how much you sweat and respire. Hydroguard accounts for every one of them. • Zero tracking. Zero ads. Zero subscriptions. No account to create. No email required. No analytics SDK, no crash-reporting service, no advertising ID, and no app-generated or persistent device identifier. The only network call the app makes is a request to MET Norway for the current weather at your approximate location. That's it. • One-time $4.99. You pay once. No subscription. WHAT IT ACTUALLY DOES • Calculates a daily hydration goal from your body weight, activity level, and live local weather. • Shows a ring you fill with quick-log buttons. Add up to five named bottles, mugs, or glasses; your three most recently used appear on the home screen. Until you add one, the app uses 8 / 16 / 24 oz (or metric) defaults. • Resets every day at midnight, local time. • Works offline — it can reuse the latest matching weather snapshot for up to six hours; after that, it falls back to your baseline target. • Metric and US units. WHO IT'S FOR Endurance athletes, lifters, manual workers, anyone living somewhere hot — anyone who's tired of hydration advice that ignores the fact they're standing in 100°F humidity. WHAT IT DOESN'T DO • It does not nag. There are no push notifications, by design. • It does not "gamify" anything. No streaks, no rewards, no leaderboards. • It does not store a history beyond the current day. Today's intake is on your phone; yesterday is gone. If you want long-term tracking, this isn't the app — and that's intentional. • It does not create a profile, sell data, run analytics, or use information for advertising. There is no cloud sync, friends list, or social anything. PERMISSIONS • Approximate location — sent to MET Norway for local weather. Hydroguard does not persist location history or send it anywhere else, and never asks for precise GPS or background location. MET Norway receives the request IP and coordinates in its access logs; details are in the privacy policy. • Internet — used only to call MET Norway's Locationforecast API. PRIVACY Your profile and water log stay on your phone. The privacy policy explains the weather request, MET Norway's access logs, and every local value the app stores. THE SCIENCE The calculation uses transparent, auditable product heuristics rather than a black-box model. A 160 oz/day product guardrail limits extreme stacked estimates; people with sustained heat or exertion needs should use an individualized clinician or workplace hydration plan. HEALTH INFORMATION Hydroguard is not a medical device and does not diagnose, treat, cure, or prevent any medical condition. Consult a qualified healthcare professional for medical advice, diagnosis, or treatment. Hydration needs vary, and a calculated target is general wellness information, not an individualized medical recommendation.