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When he mentions Open route serice, I assume none of the route calculations is done by himself, so Optimile is just an UI for Open route service.

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I see, thanks!

Open Route Service [1] uses Vroom [2] under the hood. It seems to be based on local search with some "Solomon I1" (?) heuristic. So good heuristic routes (obtained quickly), not optimal ones.

[1] https://openrouteservice.org/

[2] https://github.com/VROOM-Project/vroom

Exactly, the free version here uses Vroom under the hood with ORS. However I do have a branch with other VEhicle routing engines, but it wouldn’t bring too much value unless you had a very specific use case that I could apply it too.

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