# TopGuru vs Medusa Interface for Hydra

The clearest difference is review sentiment: Medusa Interface for Hydra at 100% against TopGuru's 29%. Medusa Interface for Hydra also leads on rating (5.0 vs 3.5) and in-app purchases (none vs 30). TopGuru's advantage is ratings volume (413 vs 3) and chart position (#148 vs unranked). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. TopGuru sells 21 in-app purchases, starting at $9.99 per month. Medusa Interface for Hydra asks for nothing beyond the download.

Medusa Interface for Hydra holds the better App Store score, 5.0 against 3.5. That said, the two scores are not equally well evidenced: TopGuru has 413 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 29% of TopGuru's written reviews are positive against 100% of Medusa Interface for Hydra's.

TopGuru ships an update every 3 weeks, Medusa Interface for Hydra monthly. Both last shipped on October 31, 2026.

## The numbers

| Metric | TopGuru | Medusa Interface for Hydra |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (413 ratings)](https://appshunter.io/ios/app/topguru/id6451488210/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/medusa-interface-for-hydra/id6775978400/reviews)** |
| Number of ratings | **413** | 3 |
| Positive reviews | 29.3% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | **#148** | — |
| Size | 2.2 GB | 56 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [HK TOPDON TECHNOLOGY Co., LIMITED](https://appshunter.io/developer/1846276192) | [POWER HUNGRY PERFORMANCE, INC.](https://appshunter.io/developer/6775978402) |

## What reviewers say

### TopGuru

[App page](https://appshunter.io/ios/app/topguru/id6451488210)

**Currently charting:** #148 Top Grossing · Utilities (US App Store)

Transform your phone or tablet into a powerful vehicle diagnostic tool via Bluetooth. Access full system diagnosis, OBDII functions, bi-directional controls, and essential maintenance services for a wide range of car brands. Generate detailed diagnostic reports for efficient troubleshooting.

**Highlights:** Full System Diagnosis, Full OBD2 Functions, Bi-directional Control, 8 Special Maintenance Functions, AutoVIN Vehicle Identification, Diagnostic Report Generation, Wireless Bluetooth 5.0 Connection

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

**In-app purchases (21)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Auto-renewal | $9.99 | per month |
| Monthly Auto-renewal | $19.00 | per month |
| Quarterly Auto-renewal | $24.99 | per 3 months |
| Annual Auto-renewal | $49.99 | per year |
| Annual Auto-renewal | $99.00 | per year |
| Renault Gateway  1-Token | $11.99 | one-time |
| Diag Bundle Renewal | $49.99 | one-time |
| TopGuru Diagnostic Bundle | $49.99 | one-time |
| TopGuru IMMO Bundle | $49.99 | one-time |
| Renewal Bundle | $99.00 | one-time |
| TopScan Pro Renewal Bundle | $99.00 | one-time |
| Harley Moto Software | $99.99 | one-time |
| Harley Moto Software Renewal | $99.99 | one-time |
| Moto Diag Bundle Renewal-Moto | $99.99 | one-time |
| Moto Diag Bundle | $99.99 | one-time |
| Moto Diag Bundle Renewal | $99.99 | one-time |
| 22 Special Functions Bundle | $129.99 | one-time |
| Renault Gateway 10 Tokens | $129.99 | one-time |
| Renault Gateway 5 Tokens | $147.99 | one-time |
| 17 Special Functions Bundle | $179.00 | one-time |
| FCA Gateway 1-year (EU only) | $229.99 | one-time |

**What reviewers like**

- 👍 Works well on most vehicles
- 🚀 Powerful features for the price
- 💡 Useful for DIY and professional mechanics

**What reviewers complain about**

- 🐛 Frequent app crashes and bugs
- ⏱️ Slow and cumbersome to use due to constant updates
- 🔒 Concerns about data privacy and security
- 💰 Subscription model after initial purchase

**Reported bugs**

- Incompatibility with certain vehicle models
- Login and account issues
- Unreliable Bluetooth connectivity

**Requested features**

- iPad optimization and full-screen support
- Expanded vehicle coverage, especially for motorcycles
- Ability to save and export diagnostic data


### 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 TopGuru free?

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

### Is Medusa Interface for Hydra free?

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

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

Medusa Interface for Hydra is rated higher. TopGuru averages 3.5 out of 5 from 413 ratings, while Medusa Interface for Hydra averages 5.0 from 3 ratings.

### Do TopGuru or Medusa Interface for Hydra have ads?

Neither TopGuru nor Medusa Interface for Hydra shows ads.

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

TopGuru ships an update every 3 weeks, and Medusa Interface for Hydra monthly. Most recently, TopGuru was updated on October 31, 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.*