# Formula AI vs Kalogram

The clearest difference is in-app purchases: Formula AI at none against Kalogram's 3. Kalogram's advantage is iOS requirement (13.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Kalogram sells 3 in-app purchases, starting at $3.99 per month. Formula AI asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 9 days. Both last shipped on October 24, 2026.

## The numbers

| Metric | Formula AI | Kalogram |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | Every 9 days |
| Size | 120 MB | 58 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [UDEVS, MASULIYATI CHEKLANGAN JAMIYATI](https://appshunter.io/developer/1528483613) | [Havvo Express](https://appshunter.io/developer/1794563344) |

## What reviewers say

### Formula AI

[App page](https://appshunter.io/ios/app/formula-ai/id6759285943)

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

**In-app purchases:** none


### Kalogram

[App page](https://appshunter.io/ios/app/kalogram-calorie-tracker/id6760027472)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kalogram Premium Monthly | $3.99 | per month |
| Kalogram Premium 3 Months | $9.99 | per 3 months |
| Kalogram Premium — Annual | $19.99 | per year |


## Frequently asked questions

### Is Formula AI free?

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

### Is Kalogram free?

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

### Do Formula AI or Kalogram have ads?

Neither Formula AI nor Kalogram shows ads.

### Which is updated more often, Formula AI or Kalogram?

Formula AI ships an update every 9 days, and Kalogram every 9 days. Most recently, Formula AI was updated on October 24, 2026 and Kalogram on October 24, 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.*