There are several UK tools for looking up crime, schools and house prices by postcode. They're good at different things. These comparisons are honest about where the others are stronger.
Most of these tools draw on the same public datasets, so the differences come down to how much they cover, how much they ask of you, and how readable the result is. Worth checking:
It's free with no account, and it puts crime, schools, flood risk, transport, amenities, house prices and demographics into one report in about thirty seconds. It won't be the right answer for everyone — if you want deep demographic breakdowns or noise data, other tools go further, and the comparisons above say so.
Free, no sign-up, no account.