OBDeleven vs simos.app
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OBDeleven
Transform your smartphone into a powerful car diagnostic and customization tool. Easily scan trouble codes, monitor live data, and access advanced features like coding and service functions for a wide range of car brands. Save time and money on car maintenance and personalization.
- Basic OBD2 diagnostics
- Live data monitoring
- Advanced diagnostics for licensed brands
- One-Click Apps for customization
- Vehicle history and VIN data
- Maintenance and comfort features
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More than a scanner – OBDeleven app is your car's everyday diagnostics, customization, and maintenance companion. Read and clear fault codes, monitor live data, and unlock hidden features in your car – no technical skills required. Trusted by over 6 million drivers and officially licensed by Volkswagen Group, BMW Group, Toyota Group, Ford (US models), and Mercedes-Benz, OBDeleven helps you save time and money on car diagnostics, maintenance, and repairs. The OBDeleven app works with OBDeleven 3 and ELM327 devices. ELM327 supports basic OBD2 diagnostics, while OBDeleven 3 unlocks advanced diagnostics, coding, and customization features. OBDELEVEN FEATURES For all car brands: • OBD2 diagnostics: Read and clear engine and transmission fault codes • Live data: Monitor real-time data like engine speed, temperature, and load • Vehicle information: Access VIN data, mileage, and key car details For Volkswagen Group (Audi, Volkswagen, Škoda, SEAT, Cupra), BMW Group (BMW, MINI), Toyota Group (Toyota, Lexus), Ford (US models), Mercedes-Benz: • Advanced diagnostics: Scan all control units and detect issues across your vehicle • Live data: Track detailed real-time data from multiple systems • One-Click Apps: Customize your Audi, Volkswagen, Škoda, SEAT, Cupra, BMW, MINI, Toyota, Lexus, Ford, and Mercedes-Benz with pre-made coding options • Manual coding & adaptations (PRO): Perform coding, long coding, adaptations, and advanced configuration for Volkswagen Group vehicles • Vehicle access: View detailed vehicle information, history, and specifications • Maintenance & driving features: ○ Car health report ○ Trip tracker ○ Maintenance reminders ○ Emissions readiness check ○ Hybrid battery check ○ Car alerts ○ Mileage checks and more GETTING STARTED 1. Plug the OBDeleven device into your car’s OBD2 port 2. Create an account in the OBDeleven app 3. Connect and start diagnosing SUPPORTED VEHICLES Works with most cars using CAN-bus protocol (mainly from 2008 onwards). Full list: https://obdeleven.com/supported-vehicles COMPATIBILITY • OBDeleven 3 device (full functionality) • ELM327 device (basic diagnostics only) • iOS 17.0 or newer LEARN MORE • https://obdeleven.com • https://support.obdeleven.com • https://forum.obdeleven.com Terms and Conditions: https://obdeleven.com/terms-and-conditions Privacy Policy: https://obdeleven.com/privacy-policy Terms of Use (EULA): https://apple.com/legal/internet-services/itunes/dev/stdeula/
simos.app
This tool provides diagnostic, data logging, and flashing capabilities for VAG petrol engines with specific Simos ECUs. It allows real-time monitoring of engine parameters, ECU identification, and analysis of recorded data through multi-channel graphs. Users can also update their ECU with stock or custom tunes.
- Real-time ECU parameter logging
- ECU identification and info
- Multi-channel log analysis graphs
- ECU and TCU flashing
- Support for Simos 18.x and 12.1 ECUs
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simos.app is a diagnostic, data logging and flashing tool built specifically for VAG petrol engines running Simos 18.1, 18.2, 18.6, 18.10 and Simos 12.1 ECUs. The platforms found in most modern TSI and TFSI engines across Audi, VW, Škoda, SEAT, Cupra and Porsche. LIVE DATA LOGGING Read ECU parameters directly in real time. Monitor boost pressure, injection timing, lambda, temperatures, torque and more at high sample rates over a Bluetooth LE connection. ECU IDENTIFICATION Read software versions, calibration IDs and hardware info straight from the control unit. LOG ANALYSIS Visualize recorded sessions with multi-channel graphs. Spot correlations between parameters without leaving the app. FLASHING Update your ECU and TCU to the latest version for your vehicle or flash a custom tune. Full features available for Simos 18.1/18.10 and 18.6. Flashing stock files or pre-unlocked ecus for Simos 18.2, 18.4, 18.41 and Simos 12.1. –– Built for enthusiasts, tuners and workshops who need more than a generic scan tool. Basic knowledge of ECU diagnostics is recommended. This app is for informational and diagnostic purposes only. Any modifications to vehicle systems are the sole responsibility of the user and must comply with local laws and regulations. –– Bluetooth LE OBD adapter required. Get yours here: https://simos.app/dongle Other compatible adapters: Macchina A0, DIY A0 clone https://github.com/Switchleg1/AMAleg require custom firmware: https://simos.app/dongle/firmware
Screenshots
Verdict
The clearest difference is rating: simos.app at 5.0 against OBDeleven's 4.3. simos.app also leads on monetization model (free vs free with in-app purchases) and update cadence (weekly vs fortnightly). OBDeleven's advantage is ratings volume (1.6K vs 2) and chart position (#124 vs unranked). On price, ads, in-app purchases 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
Both are free to download. OBDeleven sells 10 in-app purchases, starting at $69.99 per year and simos.app sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
simos.app holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: OBDeleven has 1.6K ratings behind it against 2, so its average is the more settled of the two.
OBDeleven ships an update fortnightly, simos.app weekly. The most recent releases landed on November 11, 2026 and November 6, 2026 respectively.
| Parameter | OBDeleven | simos.app |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (1.6K ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 13.9% of reviews | — |
| Number of ratings | 1.6K — better | 2 |
| Update frequency | Fortnightly | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free — better |
| Best chart rank | #124 — better | — |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 17.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 252 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | OBDeleven UAB | Tycho Sebastian Holzer |
Customer experience
OBDeleven
simos.app
Bugs and requests
OBDeleven
Reported bugs
3 issues- App crashes on login
- Inability to change vehicle type
- Functionality breaks after updates
Requested features
3 requests- Restore free access to core features
- Improve compatibility with more vehicle makes/models
- Add more diagnostic and coding capabilities
simos.app
Not enough reviews yet to summarise bugs or requests.
In-app purchases
OBDeleven
- PRO plan$69.991 Year
- ULTIMATE plan$239.991 Year
- 10 Credits$3.99
- 100 Credits$29.99
- 1000 Shadowing Credits$34.99
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- PRO plan subscription$69.99
- 500 Credits$90.99
- 5000 Shadowing Credits$139.99
- ULTIMATE plan subscription$239.99
- 10000 Shadowing Credits$269.99
simos.app
- App VIN Unlock$17.99
- Wizard: Pops & Bangs - Single Bin$17.99
- Stage 1 Bin$179.99









