# Jotsum vs dapter

The clearest difference is update cadence: Jotsum at every 3 days against dapter's every 10 days. Jotsum also leads on device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Jotsum sells 2 in-app purchases, starting at $0.99 per month and dapter sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Jotsum ships an update every 3 days, dapter every 10 days. The most recent releases landed on September 13, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Jotsum | dapter |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 10 days |
| Size | 2 MB | 65 MB |
| Requires iOS | 17.0 | **16.4** |
| Devices | **iPhone, iPad, Mac** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Hrvoje Matosic](https://appshunter.io/developer/1805673692) | [Anuar Shaidenov](https://appshunter.io/developer/6786665450) |

## What reviewers say

### Jotsum

[App page](https://appshunter.io/ios/app/jotsum-calculator-notepad/id6785305380)

**Features:** Family Sharing, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Jotsum Pro | $0.99 | per month |
| Jotsum Pro | $29.00 | one-time |


### 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 Jotsum free?

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

### Is dapter free?

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

### Do Jotsum or dapter have ads?

Neither Jotsum nor dapter shows ads.

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

Jotsum ships an update every 3 days, and dapter every 10 days. Most recently, Jotsum was updated on September 13, 2026 and dapter on September 11, 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.*