[Not OP] Depending on your needs, Fathom[1] might work if you are on a tight budget. Summit[2] has also been building quickly in this space but I haven't tried building a full model to see how the "event-based" pricing scales.

[1] https://www.fathomhq.com/ [2] https://usesummit.com/

https://floatapp.com/ (£39.99/month to start with)