Engine Link vs LL2Link
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Engine Link
Transform your iPhone into a powerful vehicle diagnostics tool. Monitor real-time performance, read and clear fault codes, and customize your dashboard with detailed sensor data. Supports emission testing and offers a HUD mode for night driving.
- Real-time vehicle monitoring
- Read and clear OBD fault codes
- Customizable gauges and dashboards
- MPG widget and fuel efficiency plotting
- Heads up display (HUD) mode
- Horsepower, torque, and acceleration metrics
- Custom PID support
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EngineLink will turn your iPhone/iPod into vehicle / car performance / diagnostics tool and scanner that uses an OBD II WIFI adapter or a low Energy Bluetooth adapter (LELink, LELink2, Carista, Viecar) to connect to your OBD2 engine management / ECU. The only iPhone app does custom PID, now supports Torque custom PID file. BENEFITS: * Emission Test. * See what your car is doing in real-time. * Read and clear OBD fault codes. * Display car performance and sensor data. * Customizable gauges, showing only the data you were interested in * Top Ranked Car App * No in-app purchase and No subscription fees! __________________ FEATURES: + Show and reset a DTC / CEL / fault code (current, pending and history) like a scan tool + Graph data + MPG widget to plot real time fuel efficiency + Heads up display / HUD mode for night time driving (mirror the display on your vehicle's windshield) + Can read Transmission Temperatures (vehicle dependant) + Horsepower/HP & Torque / acceleration + Boost / vacuum gauge + Engine speed / Engine RPM / Engine Load /Coolant / Fuel Tank + Customizable dashboard + Full configurable GUI with user choice of dial gauge, bar gauge, plot gauge, digital gauge, and on-off gauge as display elements + Full custom PID support. + Formula support. + Preloaded GM and Ford PID libraries + Preloaded standard PID library and Prius PID libraries . + User can add more libraries within the app or by using iTunes File Sharing + Multiple ECU support. Non-CAN, 11-bit CAN, and 29-bit CAN ECU bus types + Multiframe data support + Background color option + Email user log function (access by long pressing custom PID screen) + Multiple PID formula support + 0 to 60mph timer and quarter mile timer __________________ EngineLink supports all OBD-II and EOBD compliant vehicles sold worldwide. If in doubt check with your manufacturer first or look for 'OBD2' on written on a big white label in your engine bay. The app needs an ELM compatible Bluetooth Low Energy (for iPhone4s and later) or Wi-Fi adapter to work. You can check Developer WebSite for Adapter Guide: http://www.outdoor-apps.com/enginelink.html *** If you have Bluetooth OBD adaptor, please contact support@ksolution.org for instruction before you purchase this app. Drop us an email for any suggestions/questions you may have at support@ksolution.org. We will answer.
LL2Link
Record and manage vehicle information and attitude, including speed and cornering G-force. Integrate video recording with driving data for synchronized playback and sharing. Analyze driving performance and compare trips via cloud storage.
- Record vehicle information and attitude
- Integrate video recording with driving data
- Synchronized playback of video and data
- Upload to social and video streaming platforms
- Cloud storage for driving analysis
- Supports cars, motorcycles, and scooters
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In view of the above imagination and doubt, LL2Link published a product called L2D2, the product can record vehicle information and attitude, and borrow from the handheld product (Ex. Mobile phone/tablet) will be riding or driving the vehicle information instantly, riding and manage the digital information, oneself learn riding or driving ability is at which level with the APP. L2D2 covers cars, motorcycles and scooters, just need to mount L2D2 properly and setup in the APP, you can start to record relevant information about your riding or driving. It is very simple to setup L2D2 on your car without any wiring, Automobile, for example, host unit usually setup on the front platform to get the speed of the vehicle (built-in GPS) and cornering G force and so on. Auxiliary unit should be set up on the steering wheel, so as to monitor the steering wheel rotation. L2D2 is not only a record of the vehicle information, but also integrate the CAM function similar to DV or CARCAM. L2D2 system collect videos with vehicle dynamic information. Users can see the videos and data synchronously. Saved after making time and disturbing instrument equipment to set. L2D2 is not only a combination of machine and APP, users can play the recorded videos and saved files in real time. Users can also upload them on various social platforms or video streaming platforms, and share with their friends. Another pleasure is to upload the recorded logger file to LL2Link cloud. After logging into the cloud by PC/ NB or tablet (the screen of Cell Phone is not recommended, because it’s too small), users can see the vehicle driving information and analysis information to know the difference of each trip. This information is a joy to share, both for you and your team.
Screenshots
Verdict
The clearest difference is price: LL2Link at Free against Engine Link's $5.99. Engine Link's advantage is ratings volume (62 vs 2). On rating, update cadence, ads and in-app purchases 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
LL2Link is free to download; Engine Link costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 2.9 for Engine Link against 3.0 for LL2Link. That said, the two scores are not equally well evidenced: Engine Link has 62 ratings behind it against 2, so its average is the more settled of the two.
Engine Link ships an update every 2 months, LL2Link every 3 months. The most recent releases landed on November 1, 2026 and October 22, 2026 respectively.
| Parameter | Engine Link | LL2Link |
|---|---|---|
| Price | $5.99 | Free — better |
| Rating | 2.9 (62 ratings) | 3.0 (2 ratings) — better |
| Positive reviews | 38.2% of reviews | — |
| Number of ratings | 62 — better | 2 |
| Update frequency | Every 2 months — better | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 10 MB | 27 MB |
| Age rating | 4+ | 17+ |
| Developer | K SOLUTION LLC | Cheng Hsin Yao |
Customer experience
Engine Link
LL2Link
Bugs and requests
Engine Link
Reported bugs
4 issues- App crashes on connection
- Fails to read/clear error codes
- Inaccurate sensor readings
- Compatibility issues with certain OBD dongles
Requested features
5 requests- Add support for more vehicle types
- Improve user interface and customization options
- Add more PID support, especially for EVs
- Implement language localization
- Improve data logging and export capabilities
LL2Link
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Engine Link
No in-app purchases
LL2Link
No in-app purchases









