# One vs Determination Calendar

The clearest difference is ads: One at none against Determination Calendar's shown. One also leads on iOS requirement (12.0 vs 15.6). Determination Calendar's advantage is update cadence (every 3 weeks vs every 23 months). On price, in-app purchases and device support there is nothing between them.

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

One ships an update every 23 months, Determination Calendar every 3 weeks. The most recent releases landed on September 28, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | One | Determination Calendar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/one-tap-timer/id737441400/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 23 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 1 MB | 36 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Oleksandr Prosin](https://appshunter.io/developer/1191609404) | [sangwan hong](https://appshunter.io/developer/1609172222) |

## What reviewers say

### One

[App page](https://appshunter.io/ios/app/one-tap-timer/id737441400)

A straightforward countdown timer for iPhone designed for ease of use. Its intuitive interface allows you to start and manage timers with a single tap, making it a convenient tool for daily tasks. The app focuses on essential functionality without unnecessary complexity.

**Highlights:** One-tap timer start and toggle, Vivid and intuitive user interface, Ergonomic design and functionality, Convenient for everyday use

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

**In-app purchases:** none


### Determination Calendar

[App page](https://appshunter.io/ios/app/determination-calendar/id6740302394)

**In-app purchases:** none


## Frequently asked questions

### Is One free?

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

### Is Determination Calendar free?

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

### Do One or Determination Calendar have ads?

Determination Calendar shows ads; One does not.

### Which is updated more often, One or Determination Calendar?

One ships an update every 23 months, and Determination Calendar every 3 weeks. Most recently, One was updated on September 28, 2026 and Determination Calendar on October 7, 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.*