# UCSF Eureka Research vs 99 Days Reset

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.

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.

## The numbers

| Metric | UCSF Eureka Research | 99 Days Reset |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[3.1 (330 ratings)](https://appshunter.io/ios/app/ucsf-eureka-research/id1235219119/reviews)** | — |
| Number of ratings | **330** | — |
| Positive reviews | 22.2% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Fortnightly** |
| Monetization | Free | — |
| Size | 61 MB | 2 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone |
| Age rating | 17+ | 17+ |
| Developer | [University of California at San Francisco](https://appshunter.io/developer/446489325) | [dario demenga](https://appshunter.io/developer/6774306654) |

## What reviewers say

### UCSF Eureka Research

[App page](https://appshunter.io/ios/app/ucsf-eureka-research/id1235219119)

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.

**Highlights:** Join medical research studies, Contribute to health problem solutions, Participate via smartphone, Support top research universities, Track impact on health causes

**Features:** Apple Watch app, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Smooth performance
- 👍 Easy to use
- 💡 Allows participation in multiple studies
- 👍 Reassuring to be run by academic institution

**What reviewers complain about**

- 🐛 Crashes frequently
- 🔋 High battery consumption
- 🔒 Concerns about data security and privacy
- 👎 Buggy and unstable
- 👎 Unreliable login and password reset functionality

**Reported bugs**

- 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**

- Improve stability and reliability
- Provide better instructions and guidance
- Add support for international users
- Improve battery optimization


### 99 Days Reset

[App page](https://appshunter.io/ios/app/99-days-reset/id6774306652)

**Features:** macOS Compatibility, Safari Extension, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is UCSF Eureka Research free?

UCSF Eureka Research is free to download, with no in-app purchases.

### Is 99 Days Reset free?

99 Days Reset costs $1.99, with no in-app purchases.

### Do UCSF Eureka Research or 99 Days Reset have ads?

Neither UCSF Eureka Research nor 99 Days Reset shows ads.

### Which is updated more often, UCSF Eureka Research or 99 Days Reset?

UCSF Eureka Research ships an update every 5 weeks, and 99 Days Reset fortnightly. Most recently, UCSF Eureka Research was updated on October 24, 2026 and 99 Days Reset on October 20, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*