# Flutter Tools & UI Builder Pro vs WeakSim

The clearest difference is in-app purchases: WeakSim at none against Flutter Tools & UI Builder Pro's 1. WeakSim also leads on update cadence (every 3 days vs every 2 weeks). Flutter Tools & UI Builder Pro's advantage is iOS requirement (13.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Flutter Tools & UI Builder Pro sells 1 one-off in-app purchase. WeakSim asks for nothing beyond the download.

Flutter Tools & UI Builder Pro ships an update every 2 weeks, WeakSim every 3 days. The most recent releases landed on October 12, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Flutter Tools & UI Builder Pro | WeakSim |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Size | 67 MB | 15 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Thiem Nguyen](https://appshunter.io/developer/1658699065) | [Nanning Signalling Network Technology Co., Ltd](https://appshunter.io/developer/1758343835) |

## What reviewers say

### Flutter Tools & UI Builder Pro

[App page](https://appshunter.io/ios/app/flutter-tools-and-ui-builder-pro/id6499068488)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Lifetime | $6.99 | one-time |


### WeakSim

[App page](https://appshunter.io/ios/app/weaksim-network-simulator/id6804099040)

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

**In-app purchases:** none


## Frequently asked questions

### Is Flutter Tools & UI Builder Pro free?

Flutter Tools & UI Builder Pro is free to download, with in-app purchases available.

### Is WeakSim free?

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

### Do Flutter Tools & UI Builder Pro or WeakSim have ads?

Neither Flutter Tools & UI Builder Pro nor WeakSim shows ads.

### Which is updated more often, Flutter Tools & UI Builder Pro or WeakSim?

Flutter Tools & UI Builder Pro ships an update every 2 weeks, and WeakSim every 3 days. Most recently, Flutter Tools & UI Builder Pro was updated on October 12, 2026 and WeakSim on September 30, 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.*