# MRT Map vs Gantry SG

The clearest difference is in-app purchases: Gantry SG at none against MRT Map's 4. Gantry SG also leads on update cadence (every 2 days vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. MRT Map sells 4 one-off in-app purchases. Gantry SG asks for nothing beyond the download.

MRT Map ships an update monthly, Gantry SG every 2 days. The most recent releases landed on July 22, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | MRT Map | Gantry SG |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 days** |
| Size | 10 MB | 21 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [33 YAGA PTE. LTD.](https://appshunter.io/developer/1536277523) | [Linlay Lee](https://appshunter.io/developer/6789116528) |

## What reviewers say

### MRT Map

[App page](https://appshunter.io/ios/app/mrt-map/id6479568532)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sponsor | $0.99 | one-time |
| Sponsor a bit of tidy sum | $2.99 | one-time |
| Sponsor a lot | $6.99 | one-time |
| Sponsor VIP | $12.99 | one-time |


### Gantry SG

[App page](https://appshunter.io/ios/app/gantry-sg/id6789116526)

**In-app purchases:** none


## Frequently asked questions

### Is MRT Map free?

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

### Is Gantry SG free?

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

### Do MRT Map or Gantry SG have ads?

Neither MRT Map nor Gantry SG shows ads.

### Which is updated more often, MRT Map or Gantry SG?

MRT Map ships an update monthly, and Gantry SG every 2 days. Most recently, MRT Map was updated on July 22, 2026 and Gantry SG on September 17, 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.*