# One Calendar vs Milestone

The clearest difference is monetization model: Milestone at free against One Calendar's free with in-app purchases. Milestone also leads on review sentiment (100% vs 81%) and rating (5.0 vs 4.8). One Calendar's advantage is ratings volume (21K vs 1) and device support (4 vs 1). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. One Calendar sells 1 one-off in-app purchase and Milestone sells 6 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Milestone holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: One Calendar has 21K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 81% of One Calendar's written reviews are positive against 100% of Milestone's.

One Calendar ships an update fortnightly, Milestone every 4 weeks. The most recent releases landed on October 14, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | One Calendar | Milestone |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (21K ratings)](https://appshunter.io/ios/app/one-calendar/id1238379385/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/milestone-commitment-tracker/id6798370592/reviews)** |
| Number of ratings | **21K** | 1 |
| Positive reviews | 80.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 4 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Size | 89 MB | 59 MB |
| Requires iOS | **15.0** | 16.4 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Code Spark](https://appshunter.io/developer/1238379384) | [Levi Provance](https://appshunter.io/developer/6790820256) |

## What reviewers say

### One Calendar

[App page](https://appshunter.io/ios/app/one-calendar/id1238379385)

Consolidate all your digital calendars into a single, easy-to-read view. Manage appointments, events, and birthdays from various providers like Google, Outlook, iCloud, and more, all within one application.

**Highlights:** Integrates multiple calendar providers, Easy-to-read overview, Manage appointments and events, View birthdays, Cross-platform availability

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OneCalendar premium | $5.99 | one-time |

**What reviewers like**

- 🚀 Easy to use
- 👍 Clean and simple interface
- 👍 Integrates multiple calendars
- 🚀 Syncs across devices
- 👍 Customizable colors and themes

**What reviewers complain about**

- 🐛 Syncing issues
- 🐛 Bugs and glitches
- 🔒 Lacks security features
- 🔋 Drains battery
- 👎 Restrictive features in free version

**Reported bugs**

- Sync errors
- Unresponsive buttons
- Incorrect time zone display
- Duplicate events
- Inability to delete future occurrences of recurring events

**Requested features**

- Multiple reminders for events
- Ability to edit recurring events
- Option to change event calendar after creation
- Printing support
- More customization options


### Milestone

[App page](https://appshunter.io/ios/app/milestone-commitment-tracker/id6798370592)

Create personalized, fixed-length challenges with daily rules and consequences. Track your progress visually and generate shareable recaps upon completion. Your goals, your terms, all stored privately on your device.

**Highlights:** Customizable challenges, Daily rule setting, Configurable consequences, Visual progress tracking, Shareable completion recaps, Private by design (no account needed)

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Finisher Discount | $3.99 | one-time |
| Challenge, up to 30 days | $4.99 | one-time |
| Finisher Discount | $7.99 | one-time |
| Challenge, 31 to 75 days | $9.99 | one-time |
| Finisher Discount | $11.99 | one-time |
| Challenge, 76 days and up | $14.99 | one-time |


## Frequently asked questions

### Is One Calendar free?

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

### Is Milestone free?

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

### Which has better reviews, One Calendar or Milestone?

Milestone is rated higher. One Calendar averages 4.8 out of 5 from 21K ratings, while Milestone averages 5.0 from 1 ratings.

### Do One Calendar or Milestone have ads?

Neither One Calendar nor Milestone shows ads.

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

One Calendar ships an update fortnightly, and Milestone every 4 weeks. Most recently, One Calendar was updated on October 14, 2026 and Milestone on October 11, 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.*