# Simrad PRO System Builder vs TMG BT

The clearest difference is update cadence: TMG BT at monthly against Simrad PRO System Builder's every 3 months. TMG BT also leads on device support (3 vs 1). Simrad PRO System Builder's advantage is iOS requirement (9.0 vs 14.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Simrad PRO System Builder ships an update every 3 months, TMG BT monthly. The most recent releases landed on March 11, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Simrad PRO System Builder | TMG BT |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Size | 130 MB | 33 MB |
| Requires iOS | **9.0** | 14.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Navico Norway AS](https://appshunter.io/developer/842162153) | [The Marine Guadian LLC](https://appshunter.io/developer/1686542285) |

## What reviewers say

### Simrad PRO System Builder

[App page](https://appshunter.io/ios/app/simrad-pro-system-builder/id1049983593)

**Features:** macOS Compatibility

**In-app purchases:** none


### TMG BT

[App page](https://appshunter.io/ios/app/tmg-bt/id6448838544)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Simrad PRO System Builder free?

Simrad PRO System Builder is free to download, with no in-app purchases.

### Is TMG BT free?

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

### Do Simrad PRO System Builder or TMG BT have ads?

Neither Simrad PRO System Builder nor TMG BT shows ads.

### Which is updated more often, Simrad PRO System Builder or TMG BT?

Simrad PRO System Builder ships an update every 3 months, and TMG BT monthly. Most recently, Simrad PRO System Builder was updated on March 11, 2026 and TMG BT on September 18, 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.*