Your tune, read from the log.
Upload your blackbox log and describe your build in a sentence. You get a thorough tuning diagnosis — FFT spectra, filter effectiveness, step response and a tune score — plus ready-to-paste Betaflight CLI commands.
- Free to start
- Demo without an account
- Betaflight 4.x
- runs in your browser
Solid overall. Two concrete findings: slight propwash on roll and a noise peak at 227 Hz in the gyro — both fixable.
# Roll: propwash + noise peak set p_roll = 42 set d_roll = 40 set gyro_lpf1_dyn_hz = 150,450 save
From log to finished tune — three steps.
No squinting at diagrams. PIDoctor reads the log, names the problems and hands you the right commands.
Upload the log
Drop in your .bbl / .bfl from the blackbox logger and describe your build in a line (firmware, board, motors).
Automatic diagnosis
FFT, filter analysis, step response and a tune score — rule-based, plus a clear plain-language explanation.
Paste the commands
Copy ready-made Betaflight CLI commands — or push them straight to the connected flight controller over Web Serial.
Concrete findings, not raw curves.
Every finding names the axis, severity and the concrete next step — with Hz, PID and filter values. Example from a demo analysis.
Propwash
Ringing as the quad drops through its own wash. Raise D on roll slightly, back off P a touch.
Noise peak 227 Hz
A narrow resonance in the gyro spectrum. Tighten the dynamic LPF range so the peak gets damped.
Step response clean
Rise and overshoot are in the green. No change needed — leave it.
Demo data for illustration — real values come from your log.
Built for people who actually tune.
FFT spectra & filter effectiveness
See exactly where noise sits and how well your filters take it out — with named frequencies.
Step response & tune score
Rise time, overshoot and an overall score per axis — a quick health check for the tune.
Ready-made CLI commands
Rule-based suggestions for PIDs and filters — to copy, not to derive yourself.
Web Serial to the flight controller
Write changes straight to the connected FC — no detour through a separate tool.
Analyze your last flight.
Upload your blackbox log and get a concrete diagnosis with ready-to-paste commands in seconds.