This tool takes your two postcodes and converts them into a uni constituency and a home constituency.
Then, for each constituency (or 'seat'), we look at 3 different metrics to decide how competitive it is (i.e. whether multiple candidates stand a chance or not). These metrics are: whether it changed hands in the last election in 2019; how big the vote margin was in 2019; and the latest prediction from YouGov for who will win this seat.
Finally, we assign a competitiveness rating to each seat, from "Very competitive" to "Safe seat", and use that to decide which one (if any) is the one where your vote could count the most.