Hi HN, co-founder here! We designed Marple for engineers to make visual analysis intuitive and powerful. Most of our users are control systems engineers or test engineers (but not the kind that tests software). They often have to draw conclusions from millions of time series data points. As a quick example: logging data from a drone control system for 15 minutes at 1.5 kHz is already more than 1 million samples.

This creates some interesting technical challenges. We implemented a custom visualisation engine that efficiently displays only the data that fits the screen. In the same way, we also support applying functions such as low-pass filters, integrals, derivatives, etc.

Having a visual approach to analysing data is in our opinion still highly underrated. Common engineering tools such as Matlab or python+matplotlib scripts require you to reduce the number of samples yourself. And you end up with a plot that is not interactive: zooming, panning highlighting, adding a different signal are all cumbersome or impossible. Marple treats interactivity as a first class citizen.

We recently launched a beta version and we're currently looking for test users to try it out. If you sometimes need to visualise some data from a .csv file, python script, matlab script, simulation, ... you should give it a spin!

Cheers! Nero