# ExpiWell vs Zemi

The clearest difference is update cadence: ExpiWell at every 5 days against Zemi's every 7 months. ExpiWell also leads on rating (4.6 vs 4.3) and ratings volume (1.5K vs 4). On price, ads, in-app purchases and monetization model there is nothing between them.

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

ExpiWell holds the better App Store score, 4.6 against 4.3. That said, the two scores are not equally well evidenced: ExpiWell has 1.5K ratings behind it against 4, so its average is the more settled of the two.

ExpiWell ships an update every 5 days, Zemi every 7 months. The most recent releases landed on November 1, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | ExpiWell | Zemi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (1.5K ratings)](https://appshunter.io/ios/app/expiwell/id1070733440/reviews)** | [4.3 (4 ratings)](https://appshunter.io/ios/app/zemi/id1628427358/reviews) |
| Number of ratings | **1.5K** | 4 |
| Positive reviews | 39.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 7 months |
| Monetization | Free | Free |
| Size | 36 MB | 3 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Expiwell, Inc.](https://appshunter.io/developer/1070733439) | [University of Southern California Apps](https://appshunter.io/developer/540434445) |

## What reviewers say

### ExpiWell

[App page](https://appshunter.io/ios/app/expiwell/id1070733440)

This app facilitates experience sampling and ecological momentary assessment for research. It allows users to share opinions and experiences through surveys and daily diaries, ensuring data privacy. Researchers can collect valuable insights through this platform.

**Highlights:** Experience sampling method (ESM), Ecological momentary assessment (EMA), Surveys and mood tracking, Daily diary entries, Just-in-time adaptive interventions (JITAI), Digital ethnography

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

**In-app purchases:** none

**What reviewers like**

- 👍 Straightforward experience
- 🚀 Clean and easy to use
- 💡 Fascinating app

**What reviewers complain about**

- 🐛 Keeps signing users out
- 🐛 App shuts down
- 🐛 Slow performance
- 🐛 Frequent updates

**Reported bugs**

- Login issues
- Incompatibility with certain devices
- Crashing during surveys

**Requested features**

- Better notification system
- More seamless interface


### Zemi

[App page](https://appshunter.io/ios/app/zemi/id1628427358)

This application enables participants in a specific EMA study to report their feelings at random intervals. It is designed for research purposes, allowing for real-time data collection on emotional states.

**Highlights:** Randomized mood reporting, Real-time data collection, EMA study participation, Feeling tracking

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ExpiWell free?

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

### Is Zemi free?

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

### Which has better reviews, ExpiWell or Zemi?

ExpiWell is rated higher. ExpiWell averages 4.6 out of 5 from 1.5K ratings, while Zemi averages 4.3 from 4 ratings.

### Do ExpiWell or Zemi have ads?

Neither ExpiWell nor Zemi shows ads.

### Which is updated more often, ExpiWell or Zemi?

ExpiWell ships an update every 5 days, and Zemi every 7 months. Most recently, ExpiWell was updated on November 1, 2026 and Zemi 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.*