Lap Analysis uses the lap details page generated by stracker to draw a time-difference chart. It is totally open-source under GPLv3 and free to use.
Install dependencies:
$ pip3 install -r requirements.txt
$ python3 lap_analysis.py --help
usage: lap_analysis.py [-h] --url URL --length LENGTH [--lapid LAPID]
[--xurl XURL] [--epsilon EPSILON]
Time-diff chart for stracker.
options:
-h, --help show this help message and exit
--url URL url of lap details page
--length LENGTH circuit length (km)
--lapid LAPID lapid of manual selection
--xurl XURL url of lap details page (cross server)
--epsilon EPSILON data alignment accuracy (default: 1e-4)