# Atomic Calendar vs QuickTask

The clearest difference is in-app purchases: Atomic Calendar at none against QuickTask's 2. Atomic Calendar also leads on ads (none vs shown). QuickTask's advantage is update cadence (every 3 weeks vs every 4 months) and iOS requirement (13.0 vs 15.0). On price and device support there is nothing between them.

Both are free to download. QuickTask sells 2 in-app purchases, starting at $2.99 per year. Atomic Calendar asks for nothing beyond the download.

Atomic Calendar ships an update every 4 months, QuickTask every 3 weeks. The most recent releases landed on September 30, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Atomic Calendar | QuickTask |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Size | 79 MB | 53 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Brandon Guigo](https://appshunter.io/developer/1772643694) | [KAZUHIRO KAKIMOTO](https://appshunter.io/developer/1378277306) |

## 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


### QuickTask

[App page](https://appshunter.io/ios/app/quicktask-todo-and-planner/id6795849723)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro - Annual | $2.99 | per year |
| Pro - Lifetime | $12.99 | one-time |


## Frequently asked questions

### Is Atomic Calendar free?

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

### Is QuickTask free?

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

### Do Atomic Calendar or QuickTask have ads?

QuickTask shows ads; Atomic Calendar does not.

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

Atomic Calendar ships an update every 4 months, and QuickTask every 3 weeks. Most recently, Atomic Calendar was updated on September 30, 2026 and QuickTask on September 29, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*