# Flex Fusion Studios vs ChainFlow

The clearest difference is in-app purchases: Flex Fusion Studios at none against ChainFlow's 1. ChainFlow's advantage is update cadence (every 2 months vs every 6 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. ChainFlow sells 1 one-off in-app purchase. Flex Fusion Studios asks for nothing beyond the download.

Flex Fusion Studios ships an update every 6 months, ChainFlow every 2 months. The most recent releases landed on September 8, 2026 and September 3, 2026 respectively.

## The numbers

| Metric | Flex Fusion Studios | ChainFlow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/chainflow-interval-timer/id6755700190/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 months** |
| Monetization | — | Freemium |
| Size | 121 MB | 22 MB |
| Requires iOS | **16.4** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Sutra Fitness, Inc.](https://appshunter.io/developer/914371834) | [Michael Ebako-Hodgson](https://appshunter.io/developer/1855675493) |

## What reviewers say

### Flex Fusion Studios

[App page](https://appshunter.io/ios/app/flex-fusion-studios/id6752585491)

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

**In-app purchases:** none


### ChainFlow

[App page](https://appshunter.io/ios/app/chainflow-interval-timer/id6755700190)

Create highly customized interval timers for any routine, from HIIT workouts to study sessions. Set unique work and rest periods for each segment, with clear audio cues and a distraction-free interface. Save your routines for easy access and hands-free operation.

**Highlights:** Custom interval chaining, Adjustable work/rest times per interval, Clear audio cues, Hands-free operation, Screen-off functionality, Routine saving, Dark interface

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ChainFlow Pro | $4.99 | one-time |


## Frequently asked questions

### Is Flex Fusion Studios free?

Flex Fusion Studios is free to download, with no in-app purchases.

### Is ChainFlow free?

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

### Do Flex Fusion Studios or ChainFlow have ads?

Neither Flex Fusion Studios nor ChainFlow shows ads.

### Which is updated more often, Flex Fusion Studios or ChainFlow?

Flex Fusion Studios ships an update every 6 months, and ChainFlow every 2 months. Most recently, Flex Fusion Studios was updated on September 8, 2026 and ChainFlow on September 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*