# Formulate vs So

The clearest difference is update cadence: Formulate at every 2 weeks against So's every 5 weeks. 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.

Formulate ships an update every 2 weeks, So every 5 weeks. Both last shipped on September 19, 2026.

## The numbers

| Metric | Formulate | So |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 5 weeks |
| Size | 117 MB | 173 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Triangle Software](https://appshunter.io/developer/903838428) | [So-Trak LTD](https://appshunter.io/developer/1545133414) |

## What reviewers say

### Formulate

[App page](https://appshunter.io/ios/app/formulate/id1497742393)

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

**In-app purchases:** none


### So

[App page](https://appshunter.io/ios/app/so-trak/id1545133412)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Formulate free?

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

### Is So free?

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

### Do Formulate or So have ads?

Neither Formulate nor So shows ads.

### Which is updated more often, Formulate or So?

Formulate ships an update every 2 weeks, and So every 5 weeks. Most recently, Formulate was updated on September 19, 2026 and So on September 19, 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.*