14 analyzers
AFR drift, Butterworth filters, VE and correlation. Run one, chart it in a click.
14 analyzers. 18 log formats. Free, forever.
Lambda delay tables
Mine your logs for injector-to-wideband delay, binned by RPM and load.
Heatmap histograms
Average any channel over RPM × MAP. Copy straight into your tune.
Five tools, one log
Every view reads the same log, one keystroke apart.
Log Viewer
Stack up to 10 plot panels on one synchronized timeline. Min/max legend, playback from 0.25x to 8x, and the GPS track map beside the chart.
Scatter Plot
Plot any two channels against each other to see how they move together, colored by a third.
Histogram
Average any channel over RPM × MAP, or count hits per cell. Copy the grid straight into your tune.
Lambda Delay
Finds injector pulse-width steps and measures how long the wideband takes to answer. Every cell shows its sample count and confidence.
Accel Enrichment
Detects tip-ins, shifts the lambda window by the measured delay, and suggests a starting correction per RPM and throttle-rate cell.
A screenshot of Accel Enrichment follows with the 3.0 release.
Supported ECUs and loggers
CSV and binary logs, opened as the ECU writes them.
- HaltechNSP CSV exports from Elite, Nexus and IC-7 ECUs..csv
- ECUMaster EMU ProCSV exports from EMU Pro and EMU Black..csv
- RomRaiderRomRaider Logger CSVs for Subaru ECUs, and generic Time-first CSVs..csv
- SpeeduinoNative MLG binary logs. No export step..mlg
- rusEFINative MLG binary logs, including 1000+ field firmware..mlg
- AiMXRK and DRK binary files from AiM loggers and dashes..xrk.drk
- Link ECUPCLink LLG binary logs..llg
- Emerald K6/M3DEM Soft logs: .lg2 channel list plus .lg1 records..lg1.lg2
- MegaSquirtTunerStudio CSV exports from MS1, MS2, MS3 and MS3-Pro..csv
- TunerStudio MSLLegacy ASCII datalogs from TunerStudio and RealDash..msl
- MHD TuningCSV logs from BMW N54, N55, S55 and B58 flashed with MHD..csv
- Motorsport ElectronicsME Tuner CSV exports from ME221 and ME442..csv
- RaceChronoCSV v3 session exports: GPS, phone sensors and OBD/CAN on one timeline..csv
- Torque ProtrackLog CSVs from the Android OBD-II app..csv
- Woolich Racing TunedWRT CSV exports from motorcycle ECUs..csv
- BlueDriver OBD-IILive data CSVs from the BlueDriver scan tool..csv
- DynamicEFIEBL WhatsUp CSVs from modified GM TBI systems..csv
- LocomotiveDatalogger CSVs with a TimeStamp and Customer header..csv
Latest release
On GitHub- webpki-roots 1.0.10. Removes
emSign ECC Root CA - G3, the root that signed the compromised intermediates. UltraLog uses these roots for update checks and the OpenECU Alliance spec download. - rustls-webpki 0.103.16. The matching certificate verifier update.