Comparison

TopGuru vs Medusa Interface for Hydra

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

TopGuru

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
Read full description

Easily link the app with your Phone or Tablet using Bluetooth, transforming your devices into a smart and high-powered diagnostic tool! Packed with essential features like complete OBDII functionality, all system diagnosis, Bi-Directional controls, AutoVIN, automatic diagnostic reports, and more, this Bluetooth OBDII scan tool is a must-have for technicians. Its versatility shines through with eight maintenance service functions and coverage for over 60 vehicle brands, making the product a portable and adaptable auto scanner. Main Features: 1. Full System Diagnosis: Covers Engine, Transmission, Airbag, ABS, ESP, TPMS, Immobilizer, Gateway, Steering, Radio, Air Conditioning, and more. 2. Full OBD2 Functions: works as an OBD2 code reader and performs all 10 modes of OBD2 testing free for life. 3. Bi-directional Control: Easily locate issues with active tests. 4. 8 Special Functions: Perform Oil Reset, Throttle Adaptation, EPB Reset, BMS Reset, and more. 5. Repair Data Library: Includes DTC Repair Guide, Technical Service Bulletin, DLC Location, Warning Light Library. 6. AutoVIN: Enables automatic vehicle identification for quick diagnosis. 7. Wireless Connection: Utilizes Bluetooth 5.0 with a range of 33 feet/10m. 8. Graphs, Values, and Dashboard-like Data Display: Ensures easy interpretation of information. 9. Generate Diagnostic Reports: Obtain detailed reports for Systems, Fault Codes, or Data Streams. 10. Pro version features 13 reset functions and IMMO capability. Terms of Use (EULA): https://plat.topdon.com/topdon-plat/out-user/baseinfo/template/getHtmlContentById?softCode=TopScan_DisplaySW_iOS&language=7&type=25

About

Medusa Interface for Hydra

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
Read full description

Medusa Interface for Hydra puts full Bluetooth control of your Power Hungry Performance Hydra Chip right in your pocket. Pair your phone with the Medusa module over Bluetooth and switch between your loaded tune positions in seconds — no extra tools, no cables. Whether you're heading to the track, towing a heavy load, or just cruising, you can change your Hydra's active position on the fly. FEATURES • Bluetooth control — connect wirelessly to your Medusa module and command your Hydra Chip from your phone. • Quick tune switching — move between Bypass and each of your loaded positions with a single tap. • Custom position names — rename every position to match your own tunes, so you always know exactly what's loaded. Names are saved separately for each Medusa device. • Multi-device memory — the app remembers your Medusa module(s) and automatically reconnects to the closest one the next time you open it. • Demo Mode — explore the full app and see how it works without a device connected. A Power Hungry Performance Hydra Chip and Medusa module are required to use this app with your vehicle. Power Hungry Performance www.gopowerhungry.com

Screenshots

TopGuru4 screens
Medusa Interface for Hydra3 screens

Verdict

The call

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 2) and chart position (#187 vs unranked). On price, update cadence, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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 2, 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.

UpkeepUpdate frequency

TopGuru ships an update every 3 weeks, Medusa Interface for Hydra monthly. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.

Scorecard6 real differences · 5 level
TopGuru versus Medusa Interface for Hydra: the parameters behind the verdict, then further details
ParameterTopGuruMedusa Interface for Hydra
PriceFreeFree
Rating3.5 (413 ratings)5.0 (2 ratings) — better
Positive reviews29.3% of reviews100.0% of reviews — better
Number of ratings413 — better2
Update frequencyEvery 3 weeks — betterMonthly
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
Best chart rank#187 — better—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.015.0
Further details — not scored
Size2.2 GB56 MB
Age rating4+4+
DeveloperHK TOPDON TECHNOLOGY Co., LIMITEDPOWER HUNGRY PERFORMANCE, INC.

Customer experience

TopGuru

All ratings409 ratings
Positive60.1%
Neutral8.3%
Negative31.5%
Written reviews191 reviews
Positive29.3%
Neutral13.1%
Negative57.6%

Medusa Interface for Hydra

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

TopGuru

Reported bugs

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

Requested features

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

Medusa Interface for Hydra

Not enough reviews yet to summarise bugs or requests.

In-app purchases

21 purchases

TopGuru

Subscriptions5
  • Monthly Auto-renewal$9.991 Month
  • Monthly Auto-renewal$19.001 Month
  • Quarterly Auto-renewal$24.993 Months
Show 2 more
  • Annual Auto-renewal$49.991 Year
  • Annual Auto-renewal$99.001 Year
One-time16
  • Renault Gateway 1-Token$11.99
  • Diag Bundle Renewal3 variants$49.99
  • TopGuru Diagnostic Bundle$49.99
Show 13 more
  • TopGuru IMMO Bundle$49.99
  • Renewal Bundle4 variants$99.00
  • TopScan Pro Renewal Bundle3 variants$99.00
  • Harley Moto Software$99.99
  • Harley Moto Software Renewal$99.99
  • Moto Diag Bundle Renewal-Moto$99.99
  • Moto Diag Bundle$99.99
  • Moto Diag Bundle Renewal$99.99
  • 22 Special Functions Bundle2 variants$129.99
  • Renault Gateway 10 Tokens$129.99
  • Renault Gateway 5 Tokens$147.99
  • 17 Special Functions Bundle2 variants$179.00
  • FCA Gateway 1-year (EU only)$229.99
None

Medusa Interface for Hydra

No in-app purchases

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 2 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 30, 2026 and Medusa Interface for Hydra on October 28, 2026.

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