I’ve tried UBS immocheck and it provides useful information on the area ( canton, village) were the house is located. you can compare with other villages/cities their “location rating” based on criteria like public transport, schools, distance from noise sources, … even population criteria like median salary in the area!
So I can recommend it to collect some information on the area.
Regarding the RE evaluation itself it’s not so useful since they are not going to reveal good data, they provide only a generic grade like “price in line” or “over/undervalued” with a really wide range. If the real value for the house is 1M CHF, their evaluation will say it’s fine from 900k to 1’100k.
~1 year ago you could bruteforce it testing many values to discover the full range and extract the average.
But now is blocked to 3 value evaluations per account.
Other free services have even wider range, like comparis.
as stated above by Bruenu IAZI is the official source used by banks, they collect past completed transaction value in the area and have a statistical database, in addition to other RE evaluation criteria. Their service cost 350fr per evaluation