You can use Testable to create an unlimited number of experiments and surveys, but you can record only 10 results for free.
For more, you need to purchase credits for $1.00 each.
With a Plus subscription you get 300 credits included and additional ones for a reduced fee of $0.75 per credit.
Lab licenses come with 300 credits for each of the 6 available users and a discounted price for additional credits of $0.75 per credit.
With a Departmental license, you get between 2000 and unlimited departmental credits, in addition to 30 credits per individual user
There is also a limit for 100MB that applies for your stimuli. With a subscription, this limit goes up to 1GB (Plus/Lab). There is no limit with a departmental account.
Additionally, with Lab subscriptions or departmental license you get premium support, with a guaranteed first response within 24h.

Membership and Licenses

Memberships and Licenses