The Health Tracker That Keeps Your Data on YOUR Phone
Most health apps collect your most intimate data — mood, medications, symptoms, menstrual cycles — and store it on their servers. Many sell it. ReactLog is architecturally different: there are no servers. Your data never leaves your iPhone.
Your Health App Is Probably Selling Your Data
Health apps routinely share data with advertisers, insurers, and data brokers. In 2024, the FTC fined multiple health apps for sharing sensitive health data without explicit user consent. Period tracking apps were scrutinized following the Dobbs decision for potential data subpoenas in jurisdictions with abortion restrictions. Mental health apps have been caught sharing therapy session data with third-party analytics providers. Even apps that claim "we don't sell your data" often use analytics SDKs that send detailed usage data to third parties.
Here's what gets collected and shared:
Every symptom, mood shift, medication, and entry reveals health conditions
Frequency and timing patterns expose behavior and health urgency
Mood cycles, medication routines, symptom correlations reveal diagnoses
The business model is clear: if you're not paying for the app, you're the product. Health apps aren't unique — this is how most free software works. But health data is different. Your health tracking data reveals mental health conditions, reproductive choices, substance use, chronic illness status, and medication history. This isn't just personal. It's weaponizable.
No Servers. Not "Secure Servers." No Servers.
The fundamental difference: ReactLog has no backend infrastructure. There's nowhere for your data to go because there's nowhere to send it. This isn't a marketing strategy. It's the architecture.
Why This Matters
GDPR and CCPA compliance isn't about policy. It's about architecture. ReactLog is compliant by design: we cannot collect what we have no access to. We cannot share what we don't store. We cannot be breached because there's nothing on our servers to breach. Your data doesn't exist anywhere except on your device, under your control.
Track Everything. Share Nothing.
ReactLog supports comprehensive health tracking. Every category stays private to your device.
Track emotional states, triggers, and patterns over time
Track prescriptions, doses, timing, and side effects
Log vitamins, herbs, and supplements with timings
Log physical symptoms, severity, and onset timing
Track sleep duration, quality, and wake patterns
Log meals, cravings, and nutritional observations
Track workouts, intensity, duration, and type
Track period timing, flow, and cycle patterns
Create custom tracking categories for your needs
All of this stays on your iPhone. We literally cannot access it.
Health Data Is the Most Sensitive Data You Have
Your health tracking data reveals intimate details about your life: mental health conditions, reproductive choices, substance use, chronic illness status, medication history, and health vulnerabilities. This information is valuable — not to you, but to others.
Who wants your health data?
Use data to deny claims, raise premiums, or reject coverage altogether
Make hiring, promotion, and firing decisions based on health status
Buy and sell your health data to anyone willing to pay
Subpoena period tracking data in abortion restriction jurisdictions
Target vulnerable people based on health conditions and treatment seeking
Sell products exploiting health concerns and conditions
ReactLog's business model is straightforward: we charge for the app. We don't need your data because we don't sell your data. We don't run ads. We don't have investors demanding growth through data monetization. We build software and ask people to pay for it. That's it.
How It Works
ReactLog operates in three simple steps.
Download ReactLog
No account creation. No email. No signup flow. Just download and start using. Your data exists only on your device from the moment you open the app.
Track What Matters
Log mood, symptoms, medications, sleep, food, exercise, or anything custom. Each entry is processed and stored locally. Nothing is sent anywhere.
Discover Patterns
ReactLog analyzes your data on your device to show correlations: what triggers your mood? How does medication timing affect sleep? All intelligence stays on your phone.
Your entire health history. Your device. Nobody else's data.
Frequently Asked Questions
Your Health Data. Your Phone. Nobody Else's Business.
Start tracking your health privately today. No account required.
Download ReactLog Free