VBOX LapTimer has different display modes which can be accessed using the UP and DOWN buttons on the front panel. The data on each screen is calculated at all times, even if it is not displayed.
The Predictive Lap Timing display (Delta Time) gives you an invaluable insight into how your current lap time compares with your fastest lap time. In addition, the high brightness color LEDs give an indication of your SPEED relative to your FASTEST LAP.
This video shows how comparing speeds at the same points on the track compared to previous laps (Delta Velocity) can help accelerate the learning process.
VBOX LapTimer has the option to show font as a high contrast outline or inverse screen colors for use in different light conditions.
Circuit Tools is designed by racing drivers for racing drivers, with none of the complexity normally associated with data analysis software.
The software will automate many tasks and give you all the information required to improve lap times.