# R3FORM vs ISO

The clearest difference is in-app purchases: R3FORM at none against ISO's 3. R3FORM also leads on iOS requirement (15.1 vs 18.1). ISO's advantage is update cadence (every 2 weeks vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. ISO sells 3 in-app purchases, starting at $3.99 per month. R3FORM asks for nothing beyond the download.

R3FORM ships an update every 3 months, ISO every 2 weeks. The most recent releases landed on October 24, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | R3FORM | ISO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/r3form/id6498955096/reviews)** | — |
| Number of ratings | **5** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 55 MB | 255 MB |
| Requires iOS | **15.1** | 18.1 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Momence, Inc.](https://appshunter.io/developer/1577856011) | [Isofi Limited](https://appshunter.io/developer/1818992497) |

## What reviewers say

### R3FORM

[App page](https://appshunter.io/ios/app/r3form/id6498955096)

Manage your fitness account, book classes, and stay connected with the studio. Easily message instructors, view announcements, and access shared content. This app simplifies your fitness journey and communication.

**Highlights:** Account management, Class and event booking, Direct messaging, Public feed for announcements, Content sharing

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

**In-app purchases:** none


### ISO

[App page](https://appshunter.io/ios/app/iso-1/id6746943723)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly Subscription | $3.99 | per month |
| Premium Yearly Subscription | $34.99 | per year |
| Unlock 'Listening History Upload' | $12.99 | one-time |


## Frequently asked questions

### Is R3FORM free?

R3FORM is free to download, with no in-app purchases.

### Is ISO free?

ISO is free to download, with in-app purchases available.

### Do R3FORM or ISO have ads?

Neither R3FORM nor ISO shows ads.

### Which is updated more often, R3FORM or ISO?

R3FORM ships an update every 3 months, and ISO every 2 weeks. Most recently, R3FORM was updated on October 24, 2026 and ISO 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.*