GynSight vs AsterKit
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
GynSight
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Endometriosis is a chronic, inflammatory condition that affects 1 in 10 women of reproductive age and is a leading cause of pelvic pain and infertility. Despite its prevalence, diagnosis is often delayed by years and typically requires invasive procedures. The WashU Medicine BRAVE study aims to change that. We are developing a user-friendly mobile app that integrates patient self-reports, behavioral data, and use this to identify blood biomarkers. Using machine learning, we will analyze this information in real time to identify patterns of pain and its underlying causes. Our goal is to improve early detection and eventually enable personalized treatmentβgiving patients answers faster and care that fits their unique experience.
AsterKit
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FIRST PERIOD GUIDE New to periods? Open the Guide tab from Calendar or Settings. Plain language, no jargon. Written for anyone at the beginning. AsterKit is a personal wellness app for tracking your cycle. Not a medical device. A private place to log your period and understand your own patterns. THE DIFFERENCE Most period apps track every tap, bundle analytics SDKs, and sell your cycle data to advertisers. AsterKit does none of that. Cycle data stays on your device, protected by the operating system. We have no servers, no database, no copy of your history. HOW IT WORKS A parent completes a quick math check (about 10 seconds) to get started. No PIN, no account. Then the 7-day free trial starts. After day 7, a one-time $4.99 purchase unlocks everything. No subscription, no recurring charges. WHAT YOU CAN DO LOG YOUR PERIOD Record start and end dates. Add intensity (light, medium, heavy, spotting), symptoms, and mood. All stored locally on your device. GENTLE PREDICTIONS After 3+ cycles, see an estimated date for your next period. Based on your personal history. Predictions are estimates only; everyone's cycle is different. ADVANCED INSIGHTS (Premium) Average cycle length, period duration, and consistency patterns. Export a PDF summary to bring to a doctor's appointment. PRIVACY, PLAINLY β’ Cycle data stays on your device. β’ We have no servers, no copy of your history. β’ The only thing that ever leaves your phone: an anonymous receipt token (it confirms your purchase is valid). That's it. β’ No analytics. No ads. No data sharing. ONE PRICE. YOURS TO KEEP. 7-day free trial, then one-time $4.99. No subscription, no recurring charges, no surprise bills. NOT MEDICAL ADVICE: AsterKit is not a medical device and should not replace professional medical advice. For medical questions about your cycle, consult a healthcare provider. Privacy policy: asterkit.app/privacy Terms: asterkit.app/terms Support: support@asterkit.app (response within 24 hours)
Screenshots
Verdict
The clearest difference is in-app purchases: GynSight at none against AsterKit's 1. AsterKit's advantage is update cadence (every 2 weeks vs every 5 weeks). On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. AsterKit sells 1 one-off in-app purchase. GynSight asks for nothing beyond the download.
GynSight ships an update every 5 weeks, AsterKit every 2 weeks. The most recent releases landed on October 13, 2026 and October 8, 2026 respectively.
| Parameter | GynSight | AsterKit |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 5 weeks | Every 2 weeks β better |
| Ads | No | No |
| In-app purchases | No β better | Yes |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.1 | 15.1 |
| Further details β not scored | ||
| Size | 69 MB | 43 MB |
| Age rating | 17+ | 12+ |
| Developer | Washington University in St. Louis | Ryan Gonzalez |
In-app purchases
GynSight
No in-app purchases
AsterKit
- AsterKit Premium$4.99
Questions
Is GynSight free?
Is AsterKit free?
Do GynSight or AsterKit have ads?
Which is updated more often, GynSight or AsterKit?
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