# Calto vs dapter

The clearest difference is in-app purchases: Calto at none against dapter's 3. Calto also leads on device support (3 vs 1). On price, update cadence, ads and iOS requirement there is nothing between them.

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

Calto ships an update every 9 days, dapter every 2 weeks. The most recent releases landed on October 12, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Calto | dapter |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 2 weeks |
| Size | 30 MB | 65 MB |
| Requires iOS | **15.6** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [JONGWOO PARK](https://appshunter.io/developer/1873952653) | [Anuar Shaidenov](https://appshunter.io/developer/6786665450) |

## What reviewers say

### Calto

[App page](https://appshunter.io/ios/app/calto-note-calculator/id6758614596)

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

**In-app purchases:** none


### dapter

[App page](https://appshunter.io/ios/app/dapter-notes-that-do-math/id6786665448)

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Dapter Plus Monthly | $3.99 | per month |
| Dapter Plus Yearly | $19.99 | per year |
| Dapter Plus Lifetime | $59.99 | one-time |


## Frequently asked questions

### Is Calto free?

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

### Is dapter free?

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

### Do Calto or dapter have ads?

Neither Calto nor dapter shows ads.

### Which is updated more often, Calto or dapter?

Calto ships an update every 9 days, and dapter every 2 weeks. Most recently, Calto was updated on October 12, 2026 and dapter on October 15, 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.*