# otu.ai vs TagNote

The clearest difference is update cadence: TagNote at every 5 days against otu.ai's fortnightly. otu.ai's advantage is iOS requirement (15.1 vs 18.2). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. otu.ai sells 2 in-app purchases, starting at $4.99 per month and TagNote sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

otu.ai ships an update fortnightly, TagNote every 5 days. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | otu.ai | TagNote |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 5 days** |
| Monetization | — | Free with in-app purchases |
| Size | 27 MB | 9 MB |
| Requires iOS | **15.1** | 18.2 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [opentutorials](https://appshunter.io/developer/1719897055) | [Jonggyou Kim](https://appshunter.io/developer/1768080207) |

## What reviewers say

### otu.ai

[App page](https://appshunter.io/ios/app/otuai/id6473810282)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $4.99 | per month |
| Yearly Subscription | $44.99 | per year |


### TagNote

[App page](https://appshunter.io/ios/app/tagnote-multi-tagging-notes/id6747192758)

This app offers a flexible, tag-based approach to note-taking, moving beyond traditional folder structures. Organize meeting notes, ideas, and web clippings with multiple tags per note, and connect your thoughts to build a personal knowledge network. It features a rich text editor and reminders for important dates.

**Highlights:** Unlimited tags per note, Rich text editor with formatting, Birthday and anniversary reminders, Tag-based knowledge network, Minimalist and distraction-free design, iCloud data synchronization

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $1.99 | per month |
| 3-month subscription | $3.99 | per 3 months |
| Annual subscription | $9.99 | per year |


## Frequently asked questions

### Is otu.ai free?

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

### Is TagNote free?

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

### Do otu.ai or TagNote have ads?

Neither otu.ai nor TagNote shows ads.

### Which is updated more often, otu.ai or TagNote?

otu.ai ships an update fortnightly, and TagNote every 5 days. Most recently, otu.ai was updated on October 25, 2026 and TagNote on October 24, 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.*