# EmboRatio vs Periodontal Chart

The clearest difference is in-app purchases: EmboRatio at none against Periodontal Chart's 2. EmboRatio also leads on ads (none vs shown) and review sentiment (100% vs 71%). Periodontal Chart's advantage is update cadence (weekly vs every 4 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Periodontal Chart sells 2 in-app purchases, starting at $1.99 per month. EmboRatio asks for nothing beyond the download.

EmboRatio ships an update every 4 months, Periodontal Chart weekly. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | EmboRatio | Periodontal Chart |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **100.0% of reviews** | 71.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Weekly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 1 MB | 39 MB |
| Requires iOS | 15.4 | **15.1** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 12+ |
| Developer | [Masaaki Hirata](https://appshunter.io/developer/942972055) | [Yuki Kuwahara](https://appshunter.io/developer/1464637125) |

## What reviewers say

### EmboRatio

[App page](https://appshunter.io/ios/app/emboratio/id1204239972)

Calculate the necessary coil length for aneurysm embolization. This tool also computes the current embolic rate and lists available coils in Japan.

**Highlights:** Coil length calculation for aneurysms, Embolic rate calculation, List of available coils in Japan, Medical calculation tool

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

**In-app purchases:** none


### Periodontal Chart

[App page](https://appshunter.io/ios/app/periodontal-chart/id1603040583)

This app allows dentists to create, save, and print detailed periodontal examination charts. It supports input for PPD, Mobility, and PCR measurements, streamlining patient data management for dental professionals.

**Highlights:** Create periodontal charts, Input PPD, Mobility, PCR, Save patient data, Print examination records, Designed for dentists

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ペリオチャートサブスクリプション | $1.99 | per month |
| ペリオチャートサブスクリプション | $5.99 | per month |


## Frequently asked questions

### Is EmboRatio free?

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

### Is Periodontal Chart free?

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

### Do EmboRatio or Periodontal Chart have ads?

Periodontal Chart shows ads; EmboRatio does not.

### Which is updated more often, EmboRatio or Periodontal Chart?

EmboRatio ships an update every 4 months, and Periodontal Chart weekly. Most recently, EmboRatio was updated on October 26, 2026 and Periodontal Chart on October 27, 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.*