Once you’ve punched in your address, TaxProper’s algorithm looks at the assessments of similar homes in your surrounding area, looking at things like size, number of rooms, construction materials, etc. If the algorithm determines that you’re paying more than your share, they generate the required paperwork and send it off to the county. The company estimates that their part of the process takes 3-5 minutes (after which you’re waiting on the county’s response, which they say takes 6-8 weeks).

https://techcrunch.com/2020/06/05/taxproper-raises-2m-to-automate-getting-your-property-taxes-lowered/