# RedGrid vs RLT SYSTEM MASTER

The clearest difference is in-app purchases: RLT SYSTEM MASTER at none against RedGrid's 2. RLT SYSTEM MASTER also leads on update cadence (every 4 days vs every 2 months) and iOS requirement (12.0 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. RedGrid sells 2 in-app purchases, starting at $9.99 per month. RLT SYSTEM MASTER asks for nothing beyond the download.

RedGrid ships an update every 2 months, RLT SYSTEM MASTER every 4 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | RedGrid | RLT SYSTEM MASTER |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/redgrid-track-red-light/id6760411418/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | Freemium | — |
| Size | 49 MB | 37 MB |
| Requires iOS | 15.1 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [JORDAN ZIMMER](https://appshunter.io/developer/1884331015) | [中玲 曹](https://appshunter.io/developer/1682161709) |

## What reviewers say

### RedGrid

[App page](https://appshunter.io/ios/app/redgrid-track-red-light/id6760411418)

This app helps users consistently track their low-level light therapy (LLLT) for hair regrowth. It offers tools for logging sessions, aligning progress photos with a unique overlay, and analyzing consistency to optimize results.

**Highlights:** Universal device hub for LLLT hardware, Smart habit and streak tracking, Visual Growth Journal with ghost mode overlay, Precision analytics for session data, Private and secure data storage, Custom schedule creation (Pro)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $9.99 | per month |
| Pro Annual | $79.99 | per year |


### RLT SYSTEM MASTER

[App page](https://appshunter.io/ios/app/rlt-system-master/id6790787023)

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

**In-app purchases:** none


## Frequently asked questions

### Is RedGrid free?

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

### Is RLT SYSTEM MASTER free?

RLT SYSTEM MASTER is free to download, with no in-app purchases.

### Do RedGrid or RLT SYSTEM MASTER have ads?

Neither RedGrid nor RLT SYSTEM MASTER shows ads.

### Which is updated more often, RedGrid or RLT SYSTEM MASTER?

RedGrid ships an update every 2 months, and RLT SYSTEM MASTER every 4 days. Most recently, RedGrid was updated on October 31, 2026 and RLT SYSTEM MASTER on October 31, 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.*