# O vs Checklist Ultra

The clearest difference is in-app purchases: O at none against Checklist Ultra's 3. O also leads on ads (none vs shown) and iOS requirement (15.5 vs 17.0). Checklist Ultra's advantage is update cadence (every 3 days vs every 3 weeks). On price and device support there is nothing between them.

Both are free to download. Checklist Ultra sells 3 in-app purchases, starting at $1.99 per month. O asks for nothing beyond the download.

O ships an update every 3 weeks, Checklist Ultra every 3 days. The most recent releases landed on September 8, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | O | Checklist Ultra |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/checklist-ultra-shared-todo/id6757340607/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 3 days** |
| Monetization | — | Free with in-app purchases |
| Size | 3 MB | 56 MB |
| Requires iOS | **15.5** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [O-TECH JAPAN](https://appshunter.io/developer/1219186631) | [Native](https://appshunter.io/developer/1674756856) |

## What reviewers say

### O

[App page](https://appshunter.io/ios/app/o-tech-shift/id1645042734)

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

**In-app purchases:** none


### Checklist Ultra

[App page](https://appshunter.io/ios/app/checklist-ultra-shared-todo/id6757340607)

Organize tasks with topics, folders, and tags for quick scanning. Set reminders and sync with your calendar. Collaborate in real-time and create recurring routines.

**Highlights:** Organize with Topics, Folders, and Tags, Push notifications and alarm reminders, Calendar sync, Real-time collaboration, Recurring routines with progress reports, Filter tasks in one tap

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus Monthly | $1.99 | per month |
| Plus Yearly | $7.99 | per year |
| Plus Lifetime | $12.99 | one-time |


## Frequently asked questions

### Is O free?

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

### Is Checklist Ultra free?

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

### Do O or Checklist Ultra have ads?

Checklist Ultra shows ads; O does not.

### Which is updated more often, O or Checklist Ultra?

O ships an update every 3 weeks, and Checklist Ultra every 3 days. Most recently, O was updated on September 8, 2026 and Checklist Ultra on June 1, 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.*