UCSF Eureka Research vs 99 Days Reset
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
UCSF Eureka Research
Participate in real medical research studies from your smartphone to help solve major health issues. Contribute to world-changing research with top universities and make a significant impact on causes you care about.
- Join medical research studies
- Contribute to health problem solutions
- Participate via smartphone
- Support top research universities
- Track impact on health causes
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Eureka makes it easy to join real medical studies and help solve the world’s biggest health problems—including heart disease, diabetes, cancer, mental illness, healthcare inequities and more. It’s now easier than ever to have a big impact on causes you care about . All it takes to contribute to world-changing research with Eureka is a smartphone and a little bit of free time. Team up with millions of other study participants helping top researchers from research universities like UCSF, Harvard, and Johns Hopkins to answer questions like, “What signals from my smartphone might predict heart disease?” and “How does physical activity affect cancer risk?” Eureka is a non-profit resource built by researchers at the University of California, San Francisco with support from the National Institutes of Health. If you have questions about signing up or your current participation, reach out to us at support@eurekaplatform.org. For the studies that are on our app, we are not currently pulling HealthKit data but are collecting approval for future use. We use the CareKit framework in our application but do not connect to it in any other way.
99 Days Reset
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99 Days Reset helps you break free from unwanted habits by removing distractions before they become a problem. Your goal is simple. Stay consistent for 99 days. Check in every day, be honest with yourself, and keep going. The app is designed to help you build better habits and make staying on track easier over time. Features 99 Day Reset Track your progress and stay accountable with a simple daily check in. Always Block Adult Websites Adult websites stay blocked at all times through a carefully designed blocking system that's made to be difficult to bypass. Intentional Mode Block the apps that trigger your habits before they become a problem. Intentional Mode helps eliminate distractions at the source so you rely less on willpower and more on your environment. Failed Mode If you relapse, Failed Mode temporarily locks your selected apps, making it much harder to immediately fall back into old habits. Private by Design Everything stays on your device. No account. No social feed. No public profile. 99 Days Reset is a self improvement tool. It is not therapy or medical treatment.
Screenshots
Verdict
The clearest difference is price: UCSF Eureka Research at Free against 99 Days Reset's $1.99. UCSF Eureka Research also leads on device support (3 vs 1) and iOS requirement (14.0 vs 17.0). 99 Days Reset's advantage is update cadence (fortnightly vs every 5 weeks). On ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
UCSF Eureka Research is free to download; 99 Days Reset costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
UCSF Eureka Research ships an update every 5 weeks, 99 Days Reset fortnightly. The most recent releases landed on October 24, 2026 and October 20, 2026 respectively.
| Parameter | UCSF Eureka Research | 99 Days Reset |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 3.1 (330 ratings) — better | — |
| Positive reviews | 22.2% of reviews | — |
| Number of ratings | 330 — better | — |
| Update frequency | Every 5 weeks | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod, Apple Watch — better | iPhone |
| Requires iOS | 14.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 61 MB | 2 MB |
| Age rating | 17+ | 17+ |
| Developer | University of California at San Francisco | dario demenga |
Bugs and requests
UCSF Eureka Research
Reported bugs
4 issues- App crashes during data entry
- Login issues, unable to reset password
- Incompatible with certain devices (e.g., jailbroken, older devices)
- Unexpected behavior when trying to opt out or delete account
Requested features
4 requests- Improve stability and reliability
- Provide better instructions and guidance
- Add support for international users
- Improve battery optimization
99 Days Reset
Not enough reviews yet to summarise bugs or requests.
In-app purchases
UCSF Eureka Research
No in-app purchases
99 Days Reset
No in-app purchases
Questions
Is UCSF Eureka Research free?
Is 99 Days Reset free?
Do UCSF Eureka Research or 99 Days Reset have ads?
Which is updated more often, UCSF Eureka Research or 99 Days Reset?
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