Understand first. Then change!

Understand your car, notice changes and service it on time. LLCAR helps extend the life of your vehicle, cut unnecessary expenses and treat resources with more care.

Install on Android See an example

At the foundation — OBD-II onboard diagnostics data. At the center — care for your car and the environment.

In the yard, the vehicle sends readings via an OBD-II adapter to a phone and to the dashboard on a laptop — Vehicle → adapter → phone → history in the dashboard

Readings over time — the basis for maintenance and repair decisions

Understand your car

Temperature, RPM, voltage and other available metrics — on clear charts. See what changes at startup, warm-up or on a trip.
See an example of readings →
Notice rising fuel consumption

LLCAR helps you see rising fuel consumption and persistent changes in engine readings from your trip history. This makes it easier to spot signs of worsening system performance and deal with them in time.
View fuel consumption comparison →
Plan maintenance

LLCAR calculates the remaining time and mileage until the next maintenance and keeps a history of replacements and repairs. Everything you need to plan maintenance — in one place.
View maintenance history →

Phone and cabinet

What the app looks like

Digital twin: Temperature, RPM and notifications in front of your eyes. Choose the available sensors and their order to keep an eye on what matters for your car.
Event log: Find the trip you need and see what was happening at the moment of the complaint. The history helps reconstruct the events before the service visit.
Readings breakdown: Compare graphs and check results to discuss possible causes with the mechanic and understand what to check next.

Screens open larger on tap.

Open the «Vehicle» section

Swipe through the screens →

Digital twin of the vehicle with readings and notifications — Digital twin

Readings breakdown in the app — Readings breakdown

Plan your maintenance, save what's been done

Enter the date and mileage of the last maintenance. In the cabinet you can see the estimated remaining time/distance until maintenance and save completed work in the repair log.

The due date hasn't arrived yet

A green sign means there's still margin left according to the selected service table. Check the remaining days and kilometers to plan a visit in advance.

Time to plan maintenance

A yellow sign means the estimated due date is approaching. Clarify which work is needed: for example, an oil change, filters, or fluids.

The estimated due date has passed

An orange sign means the interval has already expired. Check that the maintenance record is up to date; after servicing, save the date, mileage, and work performed.

View a service example →

From simple to complex, from inexpensive to more expensive

Before repairSaved readings and your observations help reconstruct when and under what conditions the problem appeared.
Work performedThe history of checks, replacements, and repairs stays with you. It's easy to find what has already been done to the car and return to the results.
After repairComparing records helps assess the result: how the readings and fuel consumption changed, and whether the previous problem recurs.
Vehicle health passportA transparent history of maintenance and readings will help when selling the car. LLCAR compiles the selected records and check results into a document for the buyer. You decide what to include and how long access lasts.

Vehicles at a workshop in a miniature LLCAR yard

Who it's for

For your own car, family access, and a work fleet

For the owner. Save symptoms and readings, prepare for a conversation with the service, and compare the result after repair.
For the family. Share access to the car with family members so they can see its data, help in time, or look into a problem.
Mechanic. See the conditions under which complaints arise, measurement data, and the service history for a specific vehicle.
Fleet manager. Collect vehicle issues in one workspace, assign jobs, and track their completion.

View a fleet example For fleets: capabilities and pilot (PDF)

Yard and city

Yard and city in the care program

Caring for a car becomes a sequence of small steps: observation, a check plan, and comparing the result. Explore the yard and the city in the demo.

LLCAR mini yard — My yardFamiliar vehicle care routines

LLCAR city — CityContinuing the care program

Details

Fuel trims: from chart to check

STFT and LTFT: what the record shows

STFT is the short-term fuel delivery trim based on oxygen sensor feedback. LTFT is the accumulated adaptation for the corresponding operating mode. Positive values indicate increased delivery relative to the base calculation, negative values indicate reduced delivery. Both trims should be examined, and with multiple cylinder banks — each bank separately.

How to compare readings

For assessment, select segments with a warmed-up engine and active closed-loop mixture control. Compare identical operating modes by RPM and load; idle and driving under load are examined separately. A stable dependence of the trim on the operating mode helps determine the direction of the check.

What before-and-after comparison provides

After eliminating the cause, check how the trims change in the same modes and take the state of the adaptations into account. LLCAR keeps the records so that the comparison relies on measurements. Fuel consumption is assessed separately from consumption records: the trim percentage is not equal to the overconsumption percentage.

How changes affect consumption

The chart helps spot changes in engine operation. Comparing consumption shows how much fuel and money went into trips before and after the service.

Select the vehicle's records for two periods. Fuel volume is calculated from consumption records; the price per liter is needed to see costs in rubles.

Open consumption by vehicle records →

How the cost of trips changes

Comparison over the same distance at a price of 65 ₽/L.

Before · 50 L per 500 km: 10 L/100 km
After · 45 L per 500 km: 9 L/100 km

Over 500 km — 5 liters and 325 ₽ less.

Open the comparison example →

Questions and Answers

Frequently Asked Questions

Is LLCAR suitable for my vehicle?

The set of available metrics depends on the vehicle and the adapter. Check the connection for free in Lite mode before paying.

Do I need to buy anything besides the subscription?

Yes, an OBD-II adapter (ELM327 or compatible) is purchased separately. The Android installation file is available on the connection page; availability on other platforms can be confirmed with support.

Will the app find the fault by itself?

Diagnostics helps distinguish possible causes and choose the next check based on the available data. A hypothesis requires confirmation; after the work, the result is verified with new measurements.

Is there a trial period?

No free trial period is provided. Current readings are available for free in Lite, while the subscription adds history and analysis.

Where can I read the full terms?

Open the service description and rates or the privacy policy.

Free and paid

Two levels

Lite

0 ₽

Current readings from the basic sensors
No analysis and no server-side history storage
Suitable for checking adapter and vehicle compatibility

Open the "Car" section

Subscription

490 ₽ / 30 days

or 3 990 ₽ / 365 days · per vehicle

Everything from Lite + vehicle history storage on the server
Viewing saved data for the selected period
Analysis of changes over the paid period

More about the plans