# FORScan Viewer vs Medusa Interface for Hydra

The clearest difference is review sentiment: Medusa Interface for Hydra at 100% against FORScan Viewer's 32%. Medusa Interface for Hydra also leads on rating (5.0 vs 2.7) and update cadence (monthly vs every 3 months). FORScan Viewer's advantage is ratings volume (105 vs 3) and iOS requirement (9.0 vs 15.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Medusa Interface for Hydra holds the better App Store score, 5.0 against 2.7. That said, the two scores are not equally well evidenced: FORScan Viewer has 105 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 32% of FORScan Viewer's written reviews are positive against 100% of Medusa Interface for Hydra's.

FORScan Viewer ships an update every 3 months, Medusa Interface for Hydra monthly. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | FORScan Viewer | Medusa Interface for Hydra |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (105 ratings)](https://appshunter.io/ios/app/forscan-viewer/id1344642568/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/medusa-interface-for-hydra/id6775978400/reviews)** |
| Number of ratings | **105** | 3 |
| Positive reviews | 31.6% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Free | Free |
| Size | 80 MB | 56 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Aleksei Savin](https://appshunter.io/developer/892347086) | [POWER HUNGRY PERFORMANCE, INC.](https://appshunter.io/developer/6775978402) |

## What reviewers say

### FORScan Viewer

[App page](https://appshunter.io/ios/app/forscan-viewer/id1344642568)

This application allows users to read and view information about the on-board network of Ford, Mazda, Lincoln, and Mercury vehicles. It supports various OBD adapters and displays diagnostic trouble codes for all modules.

**Highlights:** Read vehicle on-board network configuration, View Diagnostic Trouble Codes (DTC), Supports Ford, Mazda, Lincoln, Mercury vehicles, Compatible with OBDLink MX+, vLinker adapters, Displays module information

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 🚀 Comprehensive real-time sensor monitoring and data recording
- 📊 Detailed error code viewing and analysis capabilities
- ⚙️ Extensive vehicle customization and performance settings
- ✅ Works excellently with quality OBD2 adapters
- 🔧 Superior diagnostics compared to competing apps

**What reviewers complain about**

- 🐛 Frequent Bluetooth connectivity failures
- 🐛 WiFi connection issues and instability
- ❌ Incompatible with many popular OBD2 adapters
- 📱 iOS version severely limited compared to Windows
- ⚠️ Error codes fail to clear properly

**Reported bugs**

- App fails to detect OBD2 adapters despite successful pairing
- Bluetooth connection drops and fails to reconnect
- WiFi adapter detection not working after updates
- Error code clearing functionality non-functional
- Vehicle identification fails on certain models

**Requested features**

- Bluetooth Low Energy (BLE) adapter support
- Full feature parity between iOS and Windows versions
- Turkish language support
- Improved UI scaling for modern iPhones
- Expanded vehicle compatibility


### Medusa Interface for Hydra

[App page](https://appshunter.io/ios/app/medusa-interface-for-hydra/id6775978400)

Control your vehicle's Hydra Chip wirelessly via Bluetooth. Switch between different performance tunes instantly from your phone, customize tune names, and manage multiple devices. A demo mode is available to explore features without hardware.

**Highlights:** Bluetooth control for Hydra Chip, Quick tune switching, Customizable tune names, Multi-device memory, Demo Mode

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

**In-app purchases:** none


## Frequently asked questions

### Is FORScan Viewer free?

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

### Is Medusa Interface for Hydra free?

Medusa Interface for Hydra is free to download, with no in-app purchases.

### Which has better reviews, FORScan Viewer or Medusa Interface for Hydra?

Medusa Interface for Hydra is rated higher. FORScan Viewer averages 2.7 out of 5 from 105 ratings, while Medusa Interface for Hydra averages 5.0 from 3 ratings.

### Do FORScan Viewer or Medusa Interface for Hydra have ads?

Neither FORScan Viewer nor Medusa Interface for Hydra shows ads.

### Which is updated more often, FORScan Viewer or Medusa Interface for Hydra?

FORScan Viewer ships an update every 3 months, and Medusa Interface for Hydra monthly. Most recently, FORScan Viewer was updated on November 2, 2026 and Medusa Interface for Hydra 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.*