It is possible!
Yes, you can associate multiple websites with one Truepush profile.
Once you signup and login to Truepush, you can create any number of projects for all of your websites/sub-domains.
Also, after exceeding 30K+ subscribers you can join the monetization plan or else continue the services with an affordable pricing plan. We consider the push subscribers count for individual projects so you don’t end up paying a large amount.
For example, if you have two projects A and B with 10K+ and 40K+ subscribers. So, you will only make payment for website B.
In another case, if you have two projects A and B with 10K+ and 20K+ subscribers. This gives 30K+ subscribers on combining but you can enjoy our free push service as they are individual projects.
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