# Otti ai vs Calcium Text Calculator

The clearest difference is in-app purchases: Calcium Text Calculator at none against Otti ai's 8. Calcium Text Calculator also leads on device support (3 vs 1). Otti ai's advantage is update cadence (every 2 days vs every 5 days). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Otti ai sells 8 in-app purchases, starting at $19.99 per month. Calcium Text Calculator asks for nothing beyond the download.

Otti ai ships an update every 2 days, Calcium Text Calculator every 5 days. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Otti ai | Calcium Text Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 5 days |
| Size | 145 MB | 3 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | **iPhone, iPad, Mac** |
| Age rating | 17+ | 4+ |
| Developer | [Raz Noiman](https://appshunter.io/developer/6786263677) | [Twarge LLC](https://appshunter.io/developer/6781456673) |

## What reviewers say

### Otti ai

[App page](https://appshunter.io/ios/app/otti-ai/id6786263675)

**Features:** Vision Pro support

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Otti Pro | $19.99 | per month |
| Otti Business 25 | $150.00 | per month |
| Otti Unlimited | $200.00 | per month |
| Otti Business 50 | $250.00 | per month |
| Otti Business 120 | $500.00 | per month |
| Otti credit 10 | $10.00 | one-time |
| Otti credit 20 | $20.00 | one-time |
| Otti credit 50 | $50.00 | one-time |


### Calcium Text Calculator

[App page](https://appshunter.io/ios/app/calcium-text-calculator/id6795935652)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Otti ai free?

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

### Is Calcium Text Calculator free?

Calcium Text Calculator is free to download, with no in-app purchases.

### Do Otti ai or Calcium Text Calculator have ads?

Neither Otti ai nor Calcium Text Calculator shows ads.

### Which is updated more often, Otti ai or Calcium Text Calculator?

Otti ai ships an update every 2 days, and Calcium Text Calculator every 5 days. Most recently, Otti ai was updated on October 28, 2026 and Calcium Text Calculator 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.*