# Oto Diary vs 16 Personalities Test

The clearest difference is ads: Oto Diary at none against 16 Personalities Test's shown. 16 Personalities Test's advantage is update cadence (every 3 days vs every 6 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Oto Diary sells 1 one-off in-app purchase and 16 Personalities Test sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Oto Diary ships an update every 6 weeks, 16 Personalities Test every 3 days. Both last shipped on November 9, 2026.

## The numbers

| Metric | Oto Diary | 16 Personalities Test |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.0 (3 ratings)](https://appshunter.io/ios/app/16-personalities-test-mb16/id6762633849/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Every 3 days** |
| Monetization | — | Free with in-app purchases |
| Size | 2 MB | 57 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [torankirite](https://appshunter.io/developer/1883564850) | [Ho Yin Tsui](https://appshunter.io/developer/1561369307) |

## What reviewers say

### Oto Diary

[App page](https://appshunter.io/ios/app/oto-diary/id6760734574)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sound Diary Premium | $3.99 | one-time |


### 16 Personalities Test

[App page](https://appshunter.io/ios/app/16-personalities-test-mb16/id6762633849)

Gain profound self-awareness and understand your psychological blueprint with a precision-engineered assessment. Uncover strengths, blind spots, and career growth opportunities with deep-dive analysis and rapid results. Save your history and share personality cards with friends.

**Highlights:** Precision personality assessment, Deep-dive analysis and insights, Rapid results and profile viewing, Personal test history archive, Social sharing of personality cards, Privacy-focused with no registration, Global language support

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Buy me a coffee | $0.99 | one-time |
| Buy me a pizza | $1.99 | one-time |
| Buy me lunch | $2.99 | one-time |
| Lifetime PRO | $4.99 | one-time |


## Frequently asked questions

### Is Oto Diary free?

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

### Is 16 Personalities Test free?

16 Personalities Test is free to download, with in-app purchases available.

### Do Oto Diary or 16 Personalities Test have ads?

16 Personalities Test shows ads; Oto Diary does not.

### Which is updated more often, Oto Diary or 16 Personalities Test?

Oto Diary ships an update every 6 weeks, and 16 Personalities Test every 3 days. Most recently, Oto Diary was updated on November 9, 2026 and 16 Personalities Test on November 9, 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.*