Comparison

CarCoding vs UJS OBD Pro

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

Head to head
About

CarCoding

Diagnose vehicle faults, read and clear trouble codes, and unlock hidden features using your smartphone and an OBD2 scanner. Monitor live engine data, perform service resets, and even code ECUs on supported car models.

Highlights
  • Read and clear fault codes (DTC)
  • Live engine data and gauges
  • AI fault analysis
  • Service resets (oil, EPB, DPF)
  • ECU coding and hidden features
  • Used car inspection readiness
Features
Read full description

CarCoding is a vehicle fault diagnosis and ECU coding app for ELM327 OBD2 scanners. Read and clear fault codes, view live data, reset service indicators, inspect used vehicles, and unlock hidden features — all in one OBD2 app. Plug in a Bluetooth (BLE) or Wi-Fi adapter, connect to your vehicle's control units in seconds. Find out why the check engine light is on, clear fault codes, watch live data, unlock hidden features. ▸ OBD2 DIAGNOSTICS • FAULT CODE READING AND CLEARING (DTC) Read and clear OBD2 fault codes — standard P-codes plus manufacturer-specific B, C and U codes. Engine, transmission, ABS, airbags and body modules in a single scan. Descriptions in plain language. • AI FAULT ANALYSIS What does "P0420" mean? Built-in AI explains the likely cause, urgency and what to check first — no jargon. • LIVE ENGINE ANALYSIS Measure fuel trim and oxygen sensor response at idle and under load; the app diagnoses vacuum leaks, fuel supply issues and sensor faults from the numbers. • USED CAR CHECK AND INSPECTION READINESS Were fault codes cleared before sale? Permanent fault codes, readiness monitors and distance driven since codes were cleared on one screen. Mode 06 tests give early warning before a fault code is set. ▸ LIVE DATA AND GAUGES • DIGITAL GAUGE PANEL Track RPM, coolant temperature, oil temperature, boost pressure, fuel trim and battery voltage in real time. Design your own gauges, record drives, export OBD2 logs. • TRIP COMPUTER AND PERFORMANCE TEST Real-time and average fuel consumption, trip cost, distance and speed summary. Measure 0-100 km/h, quarter-mile and braking tests on closed track. • BATTERY, HYBRID AND DPF HEALTH Check battery health from the voltage drop while cranking. Battery status on hybrids and EVs; DPF differential pressure, regeneration status and AdBlue level on diesels. ▸ SERVICE RESET AND MAINTENANCE • OIL, EPB, DPF, SAS AND TPMS RESET Oil change reset, electric park brake (EPB) service mode, DPF regeneration, steering angle sensor (SAS) calibration and TPMS reset — with pre-flight RPM and voltage checks. • ACTUATOR TEST AND EXTENDED SENSORS On supported models, start and stop actuators directly from the app. Read vehicle-specific signals: charge percentage, module temperatures, oil life and more beyond standard OBD2. ▸ ECU CODING AND HIDDEN FEATURES • CODING Read and back up ECU coding data, then switch hidden factory features on or off: mirror folding on lock, seatbelt chime, gauge sweep, headlight behavior. Expert Mode offers direct hex/byte access. • BRAND SUPPORT The most complete coding support is on BMW and MINI. Long coding and adaptation on VW, Audi, Skoda, Seat and Cupra; telecoding on Peugeot, Citroën, DS and Opel; module coding on Ford, Fiat, Alfa Romeo, Jeep, Renault and Dacia; reading and analysis on Hyundai, Kia, Toyota and many more brands. Options vary by model. ▸ MORE • MOTORCYCLE AND TRUCK DIAGNOSIS K-line fault diagnosis and live data on motorcycles; active and historical faults plus live values over J1939 on trucks and buses. • REMOTE SUPPORT Open a support session from within the app; our team inspects your vehicle live through your phone. • 32 LANGUAGES Interface, fault code descriptions and coding labels in 32 languages. • COMPATIBILITY All OBD2-compliant vehicles (gasoline 2001+, diesel 2004+); quality ELM327 Bluetooth and Wi-Fi adapters. ▪ Coding and service resets write data to control modules. CarCoding backs up your data first — keep the ignition on and stay connected during the process. OBD2 scanner, car diagnostic tool and coding tool in one app. Download CarCoding. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://carcoding.app/privacy.html

About

UJS OBD Pro

Features
Read full description

UJS OBD Pro is exclusively designed to support UJS ROCCO Pro, serving as a professional car diagnostic and real-time monitoring application. It supports full OBDIl/EOBD standard protocols and multi-system diagnostics for ABS, Engine, Transmission and Airbag (SRS). Connect your smartphone to the UJS OBD Pro device to unlock comprehensive vehicle management. Enjoy key features including fault code reading and clearing, real-time data monitoring, performance testing, deep system scanning, AI-powered insights, customizable reports, and detailed trip analysis. It also features high-speed data transmission capabilities, paired with outstanding low-power consumption and ultra-energy-saving performance, ensuring long-lasting use without excessive battery drain. Drivers' safety and customer satisfaction are our top priorities. That's why we offer our products at an affordable price with no subscriptions and no hidden costs—ever. Every UJS diagnostic tool includes lifetime free updates and ongoing technical support, ensuring your device stays accurate and reliable for years to come. UJS OBD Pro offers multi-language support, including English, Español, Русский, 日本語,and 中文,ensuring seamless usability for users worldwide. Caution: 1. This app only supports adapters compatible with Bluetooth 5.1. 2. Available parameters may vary depending on your vehicle, as they are defined by the vehicle’s control unit rather than the UJS OBD app. 3. UJS OBD Pro is specifically optimized for use with UJS series products (UJS ROCCO Pro); compatibility with other devices is not guaranteed.

Screenshots

CarCoding4 screens
UJS OBD Pro4 screens

Verdict

The call

The clearest difference is in-app purchases: UJS OBD Pro at none against CarCoding's 4. UJS OBD Pro also leads on iOS requirement (13 vs 15.1). CarCoding's advantage is update cadence (every 2 days vs every 5 weeks). On price, 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. CarCoding sells 4 in-app purchases, starting at $7.99 per month. UJS OBD Pro asks for nothing beyond the download.

UpkeepUpdate frequency

CarCoding ships an update every 2 days, UJS OBD Pro every 5 weeks. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.

Scorecard3 real differences · 7 level
CarCoding versus UJS OBD Pro: the parameters behind the verdict, then further details
ParameterCarCodingUJS OBD Pro
PriceFreeFree
Rating1.0 (1 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 2 days — betterEvery 5 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.113 — better
Further details — not scored
Size105 MB148 MB
Age rating17+4+
DeveloperBUBISOFT YAZILIM TEKNOLOJI ITHALAT IHRACAT SANAYI TICARET LIMITED SIRKETIUJS INC

In-app purchases

4 purchases

CarCoding

Subscriptions3
  • CarCoding Pro Monthly$7.991 Month
  • CarCoding Pro 6 Months$39.956 Months
  • CarCoding Pro Annual$71.901 Year
One-time1
  • CarCoding Pro – Lifetime$71.99
None

UJS OBD Pro

No in-app purchases

Questions

Is CarCoding free?
CarCoding is free to download, with in-app purchases available.
Is UJS OBD Pro free?
UJS OBD Pro is free to download, with no in-app purchases.
Do CarCoding or UJS OBD Pro have ads?
Neither CarCoding nor UJS OBD Pro shows ads.
Which is updated more often, CarCoding or UJS OBD Pro?
CarCoding ships an update every 2 days, and UJS OBD Pro every 5 weeks. Most recently, CarCoding was updated on October 30, 2026 and UJS OBD Pro on October 28, 2026.

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