# Study Scavenger vs eResearch

The clearest difference is rating: eResearch at 4.6 against Study Scavenger's 1.8. eResearch also leads on review sentiment (90% vs 60%) and ratings volume (75 vs 11). Study Scavenger's advantage is monetization model (free vs free with in-app purchases) and iOS requirement (9.0 vs 15.1). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

eResearch holds the better App Store score, 4.6 against 1.8. That said, the two scores are not equally well evidenced: eResearch has 75 ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 60% of Study Scavenger's written reviews are positive against 90% of eResearch's.

Study Scavenger ships an update every 6 weeks, eResearch every 5 weeks. The most recent releases landed on October 11, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Study Scavenger | eResearch |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.8 (11 ratings)](https://appshunter.io/ios/app/study-scavenger/id623837822/reviews) | **[4.6 (75 ratings)](https://appshunter.io/ios/app/eresearch/id1515467795/reviews)** |
| Number of ratings | 11 | **75** |
| Positive reviews | 60.0% of reviews | **89.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 5 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 3 MB | 136 MB |
| Requires iOS | **9.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [StudyScavenger](https://appshunter.io/developer/537927736) | [Rose Research Center,LLC](https://appshunter.io/developer/1501685429) |

## What reviewers say

### Study Scavenger

[App page](https://appshunter.io/ios/app/study-scavenger/id623837822)

Discover clinical research studies you may qualify for. Filter by location and personal health details like age and existing conditions. Find opportunities to participate in medical research.

**Highlights:** Find clinical research studies, Filter by location, Filter by personal health information, Qualify for studies, Research participation

**In-app purchases:** none


### eResearch

[App page](https://appshunter.io/ios/app/eresearch/id1515467795)

Participate in clinical research from home to help advance smoking cessation and harm reduction. This platform connects volunteers with studies focused on nicotine addiction, offering remote participation, online consent, and compensation. Advance science and contribute to a healthier future.

**Highlights:** Volunteer registration for nicotine users, Online eConsent process, Compensation for participation, Remote study assessments, Telemedicine visits, Secure participant communication

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 User friendly and easy to use
- 👍 Helpful and thorough recruiters
- 👍 Consistent and on-time notifications
- 👍 Great for keeping up with studies
- 👍 Easy to navigate, even for less tech-savvy users

**What reviewers complain about**

- 🐛 Difficult to reset email
- 🐛 App notifications cannot be turned on outside the app
- 🐛 Surveys sometimes not sent
- 🐛 No taste (for Juul product)
- 🐛 Annoying review requests daily

**Reported bugs**

- Difficult to reset email
- App notifications cannot be turned on outside the app
- Surveys sometimes not sent

**Requested features**

- Allow users to turn on app notifications outside the app


## Frequently asked questions

### Is Study Scavenger free?

Study Scavenger is free to download, with no in-app purchases.

### Is eResearch free?

eResearch is free to download, with no in-app purchases.

### Which has better reviews, Study Scavenger or eResearch?

eResearch is rated higher. Study Scavenger averages 1.8 out of 5 from 11 ratings, while eResearch averages 4.6 from 75 ratings.

### Do Study Scavenger or eResearch have ads?

Neither Study Scavenger nor eResearch shows ads.

### Which is updated more often, Study Scavenger or eResearch?

Study Scavenger ships an update every 6 weeks, and eResearch every 5 weeks. Most recently, Study Scavenger was updated on October 11, 2026 and eResearch on October 17, 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.*