# 1D | 日本最大級の歯科医療メディア vs Synapp Messaging

The clearest difference is review sentiment: Synapp Messaging at 100% against 1D | 日本最大級の歯科医療メディア's 30%. 1D | 日本最大級の歯科医療メディア's advantage is monetization model (free vs ad-supported) and iOS requirement (13.0 vs 16.6). On price, update cadence, ads and in-app purchases there is nothing between them.

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

1D | 日本最大級の歯科医療メディア ships an update every 3 weeks, Synapp Messaging monthly. The most recent releases landed on September 21, 2026 and July 21, 2026 respectively.

## The numbers

| Metric | 1D | 日本最大級の歯科医療メディア | Synapp Messaging |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 30.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | **Free** | Ad-supported |
| Size | 63 MB | 56 MB |
| Requires iOS | **13.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 17+ |
| Developer | [1D inc.](https://appshunter.io/developer/566809181) | [IMHOTEP DIGITAL HEALTHCARE](https://appshunter.io/developer/1591750662) |

## What reviewers say

### 1D | 日本最大級の歯科医療メディア

[App page](https://appshunter.io/ios/app/1d/id1461470012)

Access a vast library of dental seminars and master courses from top clinicians and researchers. Learn efficiently with features like variable playback speed and slide search. Cancel anytime.

**Highlights:** Daily new dental seminars, 1,000+ dental seminars available, 14 fields, 100+ hours master courses, Variable playback speed, My list and slide search, Cancel anytime

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

**In-app purchases:** none


### Synapp Messaging

[App page](https://appshunter.io/ios/app/synapp-messaging/id1591750660)

A secure, French-hosted messaging app for healthcare professionals to enhance daily communication and collaboration. It offers unique medical features designed with user input and ensures end-to-end encryption for patient data confidentiality. User verification and a national directory facilitate connections with colleagues and specialists.

**Highlights:** Secure medical messaging, End-to-end encryption, User verification for healthcare professionals, National directory of colleagues, HIPAA compliant, ISO-27001 certified

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 1D | 日本最大級の歯科医療メディア free?

1D | 日本最大級の歯科医療メディア is free to download, with no in-app purchases.

### Is Synapp Messaging free?

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

### Do 1D | 日本最大級の歯科医療メディア or Synapp Messaging have ads?

Neither 1D | 日本最大級の歯科医療メディア nor Synapp Messaging shows ads.

### Which is updated more often, 1D | 日本最大級の歯科医療メディア or Synapp Messaging?

1D | 日本最大級の歯科医療メディア ships an update every 3 weeks, and Synapp Messaging monthly. Most recently, 1D | 日本最大級の歯科医療メディア was updated on September 21, 2026 and Synapp Messaging on July 21, 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.*