Why is up to 85% cheaper than Supermetrics? is between 22% and 85% cheaper than Supermetrics depending on the plan you have.

Supermetrics limits the number of shared logins, only 1 user can be used per account, while Dataslayer has unlimited simultaneous logins in the same plan, in addition to the Companies option, which allows unlimited users in the same plan, under the same domain and without extra hidden prices. You can see in detail a comparison of the prices here.