# deepFormula vs Occam SI

The clearest difference is in-app purchases: Occam SI at none against deepFormula's 2. deepFormula's advantage is iOS requirement (15.0 vs 26.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. deepFormula sells 2 in-app purchases, starting at $799.00 per month. Occam SI asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 4, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | deepFormula | Occam SI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Size | 84 MB | 47 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 17+ |
| Developer | [Jean Claude Zabaloff](https://appshunter.io/developer/1729237419) | [Dakota Bullard](https://appshunter.io/developer/1865709291) |

## What reviewers say

### deepFormula

[App page](https://appshunter.io/ios/app/deepformula/id6757321752)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| deepFormula | $799.00 | per month |
| deepFormula | Free | one-time |


### Occam SI

[App page](https://appshunter.io/ios/app/occam-si/id6759069376)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is deepFormula free?

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

### Is Occam SI free?

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

### Do deepFormula or Occam SI have ads?

Neither deepFormula nor Occam SI shows ads.

### Which is updated more often, deepFormula or Occam SI?

deepFormula ships an update every 2 months, and Occam SI every 2 months. Most recently, deepFormula was updated on October 4, 2026 and Occam SI on October 12, 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.*