# PlanGTD vs Atomic Calendar

The clearest difference is in-app purchases: Atomic Calendar at none against PlanGTD's 1. Atomic Calendar also leads on update cadence (every 9 days vs every 3 weeks) and iOS requirement (15.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. PlanGTD sells 1 in-app purchase, starting at $5.99 per month. Atomic Calendar asks for nothing beyond the download.

PlanGTD ships an update every 3 weeks, Atomic Calendar every 9 days. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | PlanGTD | Atomic Calendar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/plangtd-todo-task-and-project/id1470539207/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 9 days** |
| Monetization | Free with in-app purchases | — |
| Size | 32 MB | 69 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [XThunder Inc.](https://appshunter.io/developer/1464041254) | [Brandon Guigo](https://appshunter.io/developer/1772643694) |

## What reviewers say

### PlanGTD

[App page](https://appshunter.io/ios/app/plangtd-todo-task-and-project/id1470539207)

Organize your life and build good habits with this intuitive planning tool. Easily manage tasks, projects, and events, and collaborate with others. Enjoy offline access and a built-in Markdown editor for documentation.

**Highlights:** Task and project management, Habit creation and tracking, Project sharing and collaboration, Offline mode for task access, Built-in Markdown editor, Apple Watch support, Multiple themes

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PlanGTD Monthly Subscription | $5.99 | per month |


### Atomic Calendar

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

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

**In-app purchases:** none


## Frequently asked questions

### Is PlanGTD free?

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

### Is Atomic Calendar free?

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

### Do PlanGTD or Atomic Calendar have ads?

Neither PlanGTD nor Atomic Calendar shows ads.

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

PlanGTD ships an update every 3 weeks, and Atomic Calendar every 9 days. Most recently, PlanGTD was updated on November 3, 2026 and Atomic Calendar on November 5, 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.*