1. What is the issue? Please be detailed.
is there a limit to the number of webform submissions per month for odk central.
2. What steps can we take to reproduce this issue?
is there a paid version of odk central.
3. What have you tried to fix the issue?
4. Upload any forms or screenshots you can share publicly below.
Yes, ODK Cloud, is official managed hosting of Central on ODK's infrastructure. It's a paid service that guarantees hassle-free levels of speed, reliability, and security for your project.
There's no limit to the number of form submissions per month if you are self-hosting Central. On ODK Cloud, there is a generous limit on submissions per month that varies based on the subscription you choose. http://getodk.org/#pricing has more information.