# Calendar ToDo vs Studirum

The clearest difference is in-app purchases: Studirum at none against Calendar ToDo's 2. Studirum also leads on iOS requirement (15.1 vs 26.0). Calendar ToDo's advantage is update cadence (weekly vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. Calendar ToDo sells 2 in-app purchases, starting at $1.99 per month. Studirum asks for nothing beyond the download.

Calendar ToDo ships an update weekly, Studirum monthly. The most recent releases landed on October 3, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Calendar ToDo | Studirum |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Monthly |
| Size | 14 MB | 54 MB |
| Requires iOS | 26.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Yugo Okugawa](https://appshunter.io/developer/1861088480) | [Omer Aslan](https://appshunter.io/developer/1878650751) |

## What reviewers say

### Calendar ToDo

[App page](https://appshunter.io/ios/app/calendar-todo-progress-log/id6756511434)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calendar ToDo Plus Monthly | $1.99 | per month |
| Calendar ToDo Plus Annual | $14.99 | per year |


### Studirum

[App page](https://appshunter.io/ios/app/studirum-study-and-focus-timer/id6759448350)

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

**In-app purchases:** none


## Frequently asked questions

### Is Calendar ToDo free?

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

### Is Studirum free?

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

### Do Calendar ToDo or Studirum have ads?

Neither Calendar ToDo nor Studirum shows ads.

### Which is updated more often, Calendar ToDo or Studirum?

Calendar ToDo ships an update weekly, and Studirum monthly. Most recently, Calendar ToDo was updated on October 3, 2026 and Studirum on October 2, 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.*