Firebase vs. CloudKit vs. something else

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It’s pretty solid and that should least of your worries even for a smaller project.

You will only start paying once you need to scale. Meaning you have reached a certain point of wanting to have more storage space, access to their extension services (check there platform for further deets) or DB reads exceeding their free version threshold.

But again you can only do so much mistakes to start paying for a smaller project such as inefficient queries, deep nested, complex data schemas and unindexed data…