# IntervalForge vs SumCha

The clearest difference is ads: IntervalForge at none against SumCha's shown. SumCha's advantage is update cadence (weekly vs every 3 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. IntervalForge sells 1 one-off in-app purchase and SumCha sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

IntervalForge ships an update every 3 weeks, SumCha weekly. The most recent releases landed on October 28, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | IntervalForge | SumCha |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Weekly** |
| Size | 2 MB | 10 MB |
| Requires iOS | 26.0 | 26.0 |
| Devices | iPhone | **iPhone, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Shuto Nishiyama](https://appshunter.io/developer/1879174354) | [Iksang Hwang](https://appshunter.io/developer/1712487986) |

## What reviewers say

### IntervalForge

[App page](https://appshunter.io/ios/app/intervalforge-hiit-and-tabata/id6759606731)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| IntervalForge Pro | $2.99 | one-time |


### SumCha

[App page](https://appshunter.io/ios/app/sumcha-interval-running/id6819497314)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |
| SumCha Pro | $3.99 | one-time |
| SumCha Pro | $5.99 | one-time |


## Frequently asked questions

### Is IntervalForge free?

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

### Is SumCha free?

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

### Do IntervalForge or SumCha have ads?

SumCha shows ads; IntervalForge does not.

### Which is updated more often, IntervalForge or SumCha?

IntervalForge ships an update every 3 weeks, and SumCha weekly. Most recently, IntervalForge was updated on October 28, 2026 and SumCha on November 6, 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.*