# eResearch vs REMAIN!

The clearest difference is rating: eResearch at 4.7 against REMAIN!'s 4.0. eResearch also leads on ratings volume (85 vs 4). REMAIN!'s advantage is monetization model (free vs free with in-app purchases). 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, 4.7 against 4.0. That said, the two scores are not equally well evidenced: eResearch has 85 ratings behind it against 4, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly every 5 weeks. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | eResearch | REMAIN! |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (85 ratings)](https://appshunter.io/ios/app/eresearch/id1515467795/reviews)** | [4.0 (4 ratings)](https://appshunter.io/ios/app/remain/id6469935179/reviews) |
| Number of ratings | **85** | 4 |
| Positive reviews | 89.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | Every 5 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Size | 136 MB | 46 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Rose Research Center,LLC](https://appshunter.io/developer/1501685429) | [Florida State University](https://appshunter.io/developer/372797914) |

## What reviewers say

### 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


### REMAIN!

[App page](https://appshunter.io/ios/app/remain/id6469935179)

This research study app provides health and wellness information and resources for adults in the United States. It covers various health and lifestyle topics to support users' diverse needs. Access requires a specific code provided through the research study.

**Highlights:** Health and wellness information, Lifestyle topic coverage, Research study participation, Resource provision, Targeted for US adults

**In-app purchases:** none


## Frequently asked questions

### Is eResearch free?

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

### Is REMAIN! free?

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

### Which has better reviews, eResearch or REMAIN!?

eResearch is rated higher. eResearch averages 4.7 out of 5 from 85 ratings, while REMAIN! averages 4.0 from 4 ratings.

### Do eResearch or REMAIN! have ads?

Neither eResearch nor REMAIN! shows ads.

### Which is updated more often, eResearch or REMAIN!?

eResearch ships an update every 5 weeks, and REMAIN! every 5 weeks. Most recently, eResearch was updated on October 25, 2026 and REMAIN! on October 24, 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.*