# ExpiWell vs WebMO Premium

The clearest difference is price: ExpiWell at Free against WebMO Premium's $4.99. ExpiWell also leads on rating (4.6 vs 4.0) and update cadence (every 5 days vs every 17 months). WebMO Premium's advantage is review sentiment (67% vs 39%) and iOS requirement (12.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

ExpiWell is free to download; WebMO Premium costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ExpiWell holds the better App Store score, 4.6 against 4.0. 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. Written reviews complicate that: 39% of ExpiWell's written reviews are positive against 67% of WebMO Premium's, so the app with the better star average is not the one people write more warmly about.

ExpiWell ships an update every 5 days, WebMO Premium every 17 months. The most recent releases landed on October 14, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | ExpiWell | WebMO Premium |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[4.6 (1.5K ratings)](https://appshunter.io/ios/app/expiwell/id1070733440/reviews)** | [4.0 (4 ratings)](https://appshunter.io/ios/app/webmo-premium/id1448564335/reviews) |
| Number of ratings | **1.5K** | 4 |
| Positive reviews | 39.3% of reviews | **66.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 17 months |
| Monetization | **Free** | Paid |
| Size | 35 MB | 12 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Expiwell, Inc.](https://appshunter.io/developer/1070733439) | [WebMO, LLC](https://appshunter.io/developer/797898098) |

## 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


### WebMO Premium

[App page](https://appshunter.io/ios/app/webmo-premium/id1448564335)

This app allows users to build and visualize molecules in 3D, access chemical information from external databases, and interact with advanced computational chemistry programs. It's designed for students and faculty needing mobile access to molecular structures and data.

**Highlights:** 3D molecular editor, VSEPR and molecular mechanics optimization, Orbital and symmetry visualization, Chemical data lookup, Computational chemistry program integration, Spectra visualization

**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 WebMO Premium free?

WebMO Premium costs $4.99, with no in-app purchases.

### Which has better reviews, ExpiWell or WebMO Premium?

ExpiWell is rated higher. ExpiWell averages 4.6 out of 5 from 1.5K ratings, while WebMO Premium averages 4.0 from 4 ratings.

### Do ExpiWell or WebMO Premium have ads?

Neither ExpiWell nor WebMO Premium shows ads.

### Which is updated more often, ExpiWell or WebMO Premium?

ExpiWell ships an update every 5 days, and WebMO Premium every 17 months. Most recently, ExpiWell was updated on October 14, 2026 and WebMO Premium on October 7, 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.*