# Atomic Calendar vs Studirum

Atomic Calendar and Studirum are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Atomic Calendar ships an update every 3 weeks, Studirum monthly. The most recent releases landed on October 15, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Atomic Calendar | Studirum |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Size | 64 MB | 54 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Brandon Guigo](https://appshunter.io/developer/1772643694) | [Omer Aslan](https://appshunter.io/developer/1878650751) |

## 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


### 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 Atomic Calendar free?

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

### Is Studirum free?

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

### Do Atomic Calendar or Studirum have ads?

Neither Atomic Calendar nor Studirum shows ads.

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

Atomic Calendar ships an update every 3 weeks, and Studirum monthly. Most recently, Atomic Calendar was updated on October 15, 2026 and Studirum on October 2, 2026.

---

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