GR Demo vs MT CTG
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GR Demo
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GR Demo是一款方便快捷的产品演示辅助工具，主要内容为多款简易的应用demo合集，可连接Gemred团队开发的多款产品并简单演示其无线连接、数据传输等核心功能，帮助相关人员更直观地讲解产品亮点。 GR Demo is a handy product demonstration auxiliary tool, and its main content is a collection of various simple application demos. GR Demo can connect to various products developed by the GemRed team and demonstrate their core functions such as wireless connection and data transmission, helping people explain product highlights intuitively.
MT CTG
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Users connect the app and the paint meter device via Bluetooth on their phones to measure the paint thickness of vehicles.
Screenshots
Verdict
The clearest difference is update cadence: GR Demo at every 6 weeks against MT CTG's every 10 months. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
GR Demo ships an update every 6 weeks, MT CTG every 10 months. The most recent releases landed on September 13, 2026 and September 14, 2026 respectively.
| Parameter | GR Demo | MT CTG |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 6 weeks — better | Every 10 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPod, Mac — better |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 29 MB | 38 MB |
| Age rating | 4+ | 4+ |
| Developer | GemRed | Hangzhou Metrelink Technology Co., Ltd |
In-app purchases
GR Demo
No in-app purchases
MT CTG
No in-app purchases
