# Atomic Calendar vs DoTree

The clearest difference is update cadence: DoTree at every 2 days against Atomic Calendar's every 4 months. Atomic Calendar's advantage is iOS requirement (15.0 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Atomic Calendar ships an update every 4 months, DoTree every 2 days. The most recent releases landed on September 30, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Atomic Calendar | DoTree |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 days** |
| Size | 79 MB | 5 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Brandon Guigo](https://appshunter.io/developer/1772643694) | [Lars Bruckschen](https://appshunter.io/developer/1884141282) |

## What reviewers say

### Atomic Calendar

[App page](https://appshunter.io/ios/app/atomic-calendar/id6757757656)

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

**In-app purchases:** none


### DoTree

[App page](https://appshunter.io/ios/app/dotree-task-organizer/id6787357813)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Atomic Calendar free?

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

### Is DoTree free?

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

### Do Atomic Calendar or DoTree have ads?

Neither Atomic Calendar nor DoTree shows ads.

### Which is updated more often, Atomic Calendar or DoTree?

Atomic Calendar ships an update every 4 months, and DoTree every 2 days. Most recently, Atomic Calendar was updated on September 30, 2026 and DoTree on September 18, 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.*