# SIBLIN vs RFRM.

The clearest difference is update cadence: RFRM. at every 6 months against SIBLIN's every 20 months. On price, ads, in-app purchases and device support there is nothing between them.

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

SIBLIN ships an update every 20 months, RFRM. every 6 months. The most recent releases landed on September 8, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | SIBLIN | RFRM. |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 20 months | **Every 6 months** |
| Size | 31 MB | 31 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SIBLIN PERSONAL TRAINING LTD](https://appshunter.io/developer/1646938328) | [REFORM PILATES STUDIOS LTD](https://appshunter.io/developer/1811323592) |

## What reviewers say

### SIBLIN

[App page](https://appshunter.io/ios/app/siblin/id6443538586)

**Features:** macOS Compatibility

**In-app purchases:** none


### RFRM.

[App page](https://appshunter.io/ios/app/rfrm/id6745216255)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SIBLIN free?

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

### Is RFRM. free?

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

### Do SIBLIN or RFRM. have ads?

Neither SIBLIN nor RFRM. shows ads.

### Which is updated more often, SIBLIN or RFRM.?

SIBLIN ships an update every 20 months, and RFRM. every 6 months. Most recently, SIBLIN was updated on September 8, 2026 and RFRM. on September 13, 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.*