Hi folks, I built Nanostat, a web app that takes microscopy images, runs instance segmentation to identify individual particles and computes per-particle and summary statistics. Results are exportable as images/CSV. You can correct the segmentation directly in the browser (erase false positives or draw missed particles) and set a pixel to unit calibration so measurements are in real units.

As far as I know, there's no widely available tool that does this end to end. The closest things are academic projects or ImageJ, which is more of a general purpose image processor without automatic particle detection. Nanostat handles the detection, measurement, and visualization in one place.

Posting here on the off chance that there are microscopists that may be open to trying it out and giving some feedback. There's a live demo on the homepage with real electron microscopy data, where you can interact with the full workflow (eraser, overlays, histograms, metrics, etc.) without signing up. If you want to try your own images, there's a free tier