# One Calendar vs Vidsum

The clearest difference is update cadence: Vidsum at weekly against One Calendar's fortnightly. One Calendar's advantage is device support (4 vs 1) and iOS requirement (15.0 vs 17.0). On price, 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 Vidsum sells 4 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

One Calendar ships an update fortnightly, Vidsum weekly. The most recent releases landed on October 31, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | One Calendar | Vidsum |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (21K ratings)](https://appshunter.io/ios/app/one-calendar/id1238379385/reviews)** | — |
| Number of ratings | **21K** | — |
| Positive reviews | 80.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 89 MB | 27 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone |
| Age rating | 12+ | 9+ |
| Developer | [Code Spark](https://appshunter.io/developer/1238379384) | [Cloudgeng](https://appshunter.io/developer/1882524444) |

## 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


### Vidsum

[App page](https://appshunter.io/ios/app/vidsum/id6760079163)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Vidsum Pro | $9.99 | per month |
| Vidsum Pro | $99.99 | per year |
| Boost Pack — 15 hours | $4.99 | one-time |
| Boost Pack — 30 hours | $7.99 | one-time |


## Frequently asked questions

### Is One Calendar free?

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

### Is Vidsum free?

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

### Do One Calendar or Vidsum have ads?

Neither One Calendar nor Vidsum shows ads.

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

One Calendar ships an update fortnightly, and Vidsum weekly. Most recently, One Calendar was updated on October 31, 2026 and Vidsum on October 28, 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.*