Comparison

GynSight vs AsterKit

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

GynSight

Features
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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 treatmentβ€”giving patients answers faster and care that fits their unique experience.

About

AsterKit

Features
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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

GynSight4 screens
AsterKit4 screens

Verdict

The call

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. AsterKit sells 1 one-off in-app purchase. GynSight asks for nothing beyond the download.

UpkeepUpdate frequency

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.

Scorecard2 real differences Β· 4 level
GynSight versus AsterKit: the parameters behind the verdict, then further details
ParameterGynSightAsterKit
PriceFreeFree
Update frequencyEvery 5 weeksEvery 2 weeks β€” better
AdsNoNo
In-app purchasesNo β€” betterYes
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.115.1
Further details β€” not scored
Size69 MB43 MB
Age rating17+12+
DeveloperWashington University in St. LouisRyan Gonzalez

In-app purchases

None

GynSight

No in-app purchases

1 purchases

AsterKit

One-time1
  • AsterKit Premium$4.99

Questions

Is GynSight free?
GynSight is free to download, with no in-app purchases.
Is AsterKit free?
AsterKit is free to download, with in-app purchases available.
Do GynSight or AsterKit have ads?
Neither GynSight nor AsterKit shows ads.
Which is updated more often, GynSight or AsterKit?
GynSight ships an update every 5 weeks, and AsterKit every 2 weeks. Most recently, GynSight was updated on October 13, 2026 and AsterKit on October 8, 2026.

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