# OneTime vs Calume

The clearest difference is ads: Calume at none against OneTime's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. OneTime sells 4 in-app purchases, starting at $0.99 per month and Calume sells 3 in-app purchases, starting at $8.99 per month. Whichever you choose, the download price is not the number that matters.

OneTime ships an update weekly, Calume fortnightly. The most recent releases landed on October 16, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | OneTime | Calume |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Fortnightly |
| Size | 65 MB | 23 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [UNCHAN BAEK](https://appshunter.io/developer/6774037513) | [DANIEL HAVLAS](https://appshunter.io/developer/1889645064) |

## What reviewers say

### OneTime

[App page](https://appshunter.io/ios/app/onetime-daily-time-tracker/id6774037511)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Launch Monthly | $0.99 | per month |
| Monthly | $1.99 | per month |
| Token Bundle | $0.99 | one-time |
| Lifetime | $11.99 | one-time |


### Calume

[App page](https://appshunter.io/ios/app/calume-time-tracker/id6776441027)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chronicle Pro Monthly | $8.99 | per month |
| Chronicle Pro Yearly | $19.99 | per year |
| Chronicle Pro Yearly | $34.99 | per year |


## Frequently asked questions

### Is OneTime free?

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

### Is Calume free?

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

### Do OneTime or Calume have ads?

OneTime shows ads; Calume does not.

### Which is updated more often, OneTime or Calume?

OneTime ships an update weekly, and Calume fortnightly. Most recently, OneTime was updated on October 16, 2026 and Calume on October 9, 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.*