# ML Annotator vs Foxglove WebSocket Bridge

The clearest difference is rating: Foxglove WebSocket Bridge at 5.0 against ML Annotator's 3.0. ML Annotator's advantage is update cadence (every 3 days vs monthly) and device support (4 vs 2). On price, ratings volume, 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.

Foxglove WebSocket Bridge holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 4 and 3 respectively.

ML Annotator ships an update every 3 days, Foxglove WebSocket Bridge monthly. The most recent releases landed on September 22, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | ML Annotator | Foxglove WebSocket Bridge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (4 ratings)](https://appshunter.io/ios/app/ml-annotator/id1594943438/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/foxglove-websocket-bridge/id1673592198/reviews)** |
| Number of ratings | **4** | 3 |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Monthly |
| Monetization | Free | Free |
| Size | 8 MB | 4 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Dito Technologies LLC](https://appshunter.io/developer/1076141818) | [Foxglove](https://appshunter.io/developer/1673592200) |

## What reviewers say

### ML Annotator

[App page](https://appshunter.io/ios/app/ml-annotator/id1594943438)

This tool facilitates the annotation of images for machine learning tasks like object detection and classification. It supports team collaboration, Apple Pencil for precise drawing, and offers various data export formats. Users can also generate custom iPython notebooks to kickstart model creation.

**Highlights:** Image annotation for ML classifiers, Team collaboration for annotation, Apple Pencil support for iPad, Export training data in multiple formats, Generate custom iPython notebooks, Training data improvement suggestions

**Features:** Vision Pro support

**In-app purchases:** none


### Foxglove WebSocket Bridge

[App page](https://appshunter.io/ios/app/foxglove-websocket-bridge/id1673592198)

Stream robotics and sensor data from your iOS device directly to Foxglove Studio. This application serves as a demonstration, providing libraries and examples to help developers build their own custom servers for real-time data visualization.

**Highlights:** Stream sensor data from iOS, Integrates with Foxglove Studio, Demonstrates WebSocket Protocol, Provides libraries and examples, Open-source code available

**Features:** iMessage stickers, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is ML Annotator free?

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

### Is Foxglove WebSocket Bridge free?

Foxglove WebSocket Bridge is free to download, with no in-app purchases.

### Which has better reviews, ML Annotator or Foxglove WebSocket Bridge?

Foxglove WebSocket Bridge is rated higher. ML Annotator averages 3.0 out of 5 from 4 ratings, while Foxglove WebSocket Bridge averages 5.0 from 3 ratings.

### Do ML Annotator or Foxglove WebSocket Bridge have ads?

Neither ML Annotator nor Foxglove WebSocket Bridge shows ads.

### Which is updated more often, ML Annotator or Foxglove WebSocket Bridge?

ML Annotator ships an update every 3 days, and Foxglove WebSocket Bridge monthly. Most recently, ML Annotator was updated on September 22, 2026 and Foxglove WebSocket Bridge on September 25, 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.*