# InversionLetter vs 16タイプ診断

The clearest difference is ads: 16タイプ診断 at none against InversionLetter's shown. 16タイプ診断 also leads on update cadence (monthly vs every 17 months) and monetization model (free vs ad-supported). InversionLetter's advantage is review sentiment (15% vs 0%) and iOS requirement (10.3 vs 17.4). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

InversionLetter ships an update every 17 months, 16タイプ診断 monthly. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | InversionLetter | 16タイプ診断 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/inversionletter/id970949034/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | **15.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 17 months | **Monthly** |
| Monetization | Ad-supported | **Free** |
| Size | 26 MB | 6 MB |
| Requires iOS | **10.3** | 17.4 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [EIICHI KOMINE](https://appshunter.io/developer/495643581) | [Takumi Yoshikoshi](https://appshunter.io/developer/1655689141) |

## What reviewers say

### InversionLetter

[App page](https://appshunter.io/ios/app/inversionletter/id970949034)

This app allows users to invert and rotate text messages, then send them as images via email. It offers options to change characters, tilt, and invert text, with various font choices.

**Highlights:** Invert characters, Rotate text, Send as image via email, Change characters, Tilt and invert options, Font selection

**Features:** Vision Pro support

**In-app purchases:** none


### 16タイプ診断

[App page](https://appshunter.io/ios/app/16/id6621240539)

Discover your personality through a 16-type assessment. Get detailed analysis, identify strengths and weaknesses, and receive advice for personal growth and relationships. Start your self-discovery journey for free.

**Highlights:** 16 personality type assessment, Detailed personality analysis, Identify strengths and weaknesses, Relationship insights, Personal growth advice, Quick and easy questionnaire

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

**In-app purchases:** none


## Frequently asked questions

### Is InversionLetter free?

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

### Is 16タイプ診断 free?

16タイプ診断 is free to download, with no in-app purchases.

### Do InversionLetter or 16タイプ診断 have ads?

InversionLetter shows ads; 16タイプ診断 does not.

### Which is updated more often, InversionLetter or 16タイプ診断?

InversionLetter ships an update every 17 months, and 16タイプ診断 monthly. Most recently, InversionLetter was updated on November 1, 2026 and 16タイプ診断 on November 4, 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.*