# ExpiWell vs Sun Devil Central

ExpiWell and Sun Devil Central both sit at 4.6 stars, but that hides the real split: 100% of Sun Devil Central's written reviews are positive against 39% of ExpiWell's. ExpiWell's advantage is ratings volume (1.5K vs 6) and update cadence (every 5 days vs every 3 weeks). On price, rating, 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.

On the App Store both sit at effectively the same score — 4.6 for ExpiWell against 4.7 for Sun Devil Central. That said, the two scores are not equally well evidenced: ExpiWell has 1.5K ratings behind it against 6, so its average is the more settled of the two. Written reviews are what separate them: 39% of ExpiWell's written reviews are positive against 100% of Sun Devil Central's.

ExpiWell ships an update every 5 days, Sun Devil Central every 3 weeks. The most recent releases landed on October 14, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | ExpiWell | Sun Devil Central |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (1.5K ratings)](https://appshunter.io/ios/app/expiwell/id1070733440/reviews) | **[4.7 (6 ratings)](https://appshunter.io/ios/app/sun-devil-central/id6749901063/reviews)** |
| Number of ratings | **1.5K** | 6 |
| Positive reviews | 39.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 3 weeks |
| Monetization | Free | Free |
| Size | 35 MB | 61 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Expiwell, Inc.](https://appshunter.io/developer/1070733439) | [Arizona State University](https://appshunter.io/developer/367626749) |

## 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


### Sun Devil Central

[App page](https://appshunter.io/ios/app/sun-devil-central/id6749901063)

Discover and join student organizations, clubs, and campus events. Connect with fellow students based on shared interests like sports, culture, academics, or service. Enhance your university experience by staying informed about campus news and activities.

**Highlights:** Explore student organizations, Join clubs, Discover campus events, Connect with students, Stay updated on campus news

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

**In-app purchases:** none


## Frequently asked questions

### Is ExpiWell free?

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

### Is Sun Devil Central free?

Sun Devil Central is free to download, with no in-app purchases.

### Which has better reviews, ExpiWell or Sun Devil Central?

Sun Devil Central is rated higher. ExpiWell averages 4.6 out of 5 from 1.5K ratings, while Sun Devil Central averages 4.7 from 6 ratings.

### Do ExpiWell or Sun Devil Central have ads?

Neither ExpiWell nor Sun Devil Central shows ads.

### Which is updated more often, ExpiWell or Sun Devil Central?

ExpiWell ships an update every 5 days, and Sun Devil Central every 3 weeks. Most recently, ExpiWell was updated on October 14, 2026 and Sun Devil Central on October 9, 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.*