Excellent interface: the docs are a little opaque in places but all in all one of the best implementations I've worked with. Their use of scoped keys (<a href="https://keen.io/docs/security/" rel="nofollow">https://keen.io/docs/security/</a>) to allow client-side data access is pretty awesome: very surprised that I haven't seen more usage of the technique in other data providers. The ability to provide client dashboards that directly access Keen's servers from within our web app without needing to proxy the data through us is simply awesome.
Can anyone who has used or is using these guys share some feedback on your experiences? Also, if anyone knows of any other services that allow you send event data like this for later querying/analysis, I'd love to hear about them. Keen IO seems to be exactly what we're looking for, conceptually.
From their TOS:
<a href="https://keen.io/tos" rel="nofollow">https://keen.io/tos</a><p>You grant us a... fully paid license to use the Content... for purposes of providing the Services... to other users of the Services<p>They want a license to give my data away to other customers?