# Gompertz-Matsui Calculator — Calculator for HCV kinetics

> HCV kinetics calculator for response-guided therapy. (iPhone/iPad app by Keiji Matsui.)

- Source: https://appshunter.io/ios/app/gompertz-matsui-calculator/id365287269 (this page in markdown: same URL + `.md`)
- Developer: [Keiji Matsui](https://appshunter.io/developer/365287272)
- Category: Medical
- Price: Free
- Rating: 1.00/5 from 1 App Store ratings
- Age rating: 17+
- Requires: iOS 14.7 · 0 MB
- Languages: American English
- Released: 2010-04-07
- Data updated: 2026-06-24
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/gompertz-matsui-calculator/id365287269/reviews.md

## What is Gompertz?

*A strong tool for response-guided therapy against HCV!
Gompertz-Matsui Calculator, an iPhone / iPod touch application, calculates Gompertz-Matsui formula from 3-point times (t0, t1, t2) and TaqMan viral loads of hepatitis C virus: HCV (A, B, C). 

k: dumping constant
initial slope: initial decline rate of HCV
G.M.I: Gompertz-Matsui Index, a theoretical minimal value of HCV by anti-viral therapy
Gomp-Ex boundary: a threshold value of HCV between the first phase decline curve and the second phase decline slope

## Key features

- Calculates Gompertz-Matsui formula
- Uses 3-point times and viral loads
- Determines dumping constant (k)
- Calculates initial slope
- Provides Gompertz-Matsui Index (GMI)
- Identifies Gomp-Ex boundary


## Frequently asked questions about Gompertz

### What is the Gompertz-Matsui Calculator used for?

The Gompertz-Matsui Calculator is used to analyze hepatitis C virus (HCV) kinetics. It helps in response-guided therapy by calculating metrics like the dumping constant, initial slope, and Gompertz-Matsui Index from viral load data.

### What data is needed to use the Gompertz-Matsui Calculator?

To use the Gompertz-Matsui Calculator, you need three time points (t0, t1, t2) and the corresponding TaqMan viral loads for hepatitis C virus (HCV).

### What are the key outputs of the Gompertz-Matsui Calculator?

The calculator provides the dumping constant (k), initial slope (initial decline rate of HCV), Gompertz-Matsui Index (GMI), and the Gomp-Ex boundary (a threshold value for HCV decline).

### Is the Gompertz-Matsui Calculator available on Android devices?

No, the Gompertz-Matsui Calculator is currently only available for iPhone and iPod touch devices.

### How often is the Gompertz-Matsui Calculator updated?

The Gompertz-Matsui Calculator was last updated on December 11, 2021, with version 4.0. The release date was April 7, 2010.

### What is the age rating for the Gompertz-Matsui Calculator?

The Gompertz-Matsui Calculator has an age rating of 17+, indicating it is intended for mature users.

### Does the Gompertz-Matsui Calculator have ads?

No, the Gompertz-Matsui Calculator does not contain advertisements.

### What is the user feedback on the Gompertz-Matsui Calculator?

The app has received one rating of 1.0 stars, suggesting potential areas for improvement based on user experience.

## Version history (last 5 releases)

### 4.0 — 2021-12-11

iOS 14.7 compatible

### 3.0 — 2018-09-09

This app has been updated by Apple to display the Apple Watch app icon.

Optimized for iOS11
Improved stability

### 2.4 — 2014-09-30

Optimized for iOS7

### 2.2 — 2012-09-26

iPhone 5 compatible

### 2.1 — 2011-07-23

The layout has been improved.
Clear-button has been added.

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## More apps by Keiji Matsui

- [Gompertz curve Calculator](https://appshunter.io/ios/app/gompertz-curve-calculator/id369690729)
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All apps by Keiji Matsui: https://appshunter.io/developer/365287272

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-24.*