Apps with Business Plans and Developer Plans are hosted on different clusters, so there is a cost on us to migrate data between them. If you just upgraded your app from the Developer Plan to the Business Plan, you have to wait for 30 days until you can switch back. This only applies to the cases when you are making the switch on your own and doesn’t apply to those when the switch is made automatically according to certain rules.

Paid services include database, file storage, CDN, instant messaging, SMS, and LeanEngine. You can use a certain amount of each if you are using the Developer Plan. We also offer several free services, including push notifications, user management, and in-app socializing.

The minimum charge covers our cost of technical support and daily operation. For apps with Business Plans, if you spend less than the minimum charge on a day (excluding file storage and file bandwidth), the minimum charge will be billed for that day. Otherwise, the actual charge will be billed.

As long as the user uses the same ID, it will be considered as a single DAU.

The SDK designed for each language interacts with the same REST API, and the time REST API gets called will be used to calculate the price. In general, a single operation for creating objects, updating objects, or querying objects constitutes a single request. Some SDKs accept batch operations or a single operation containing multiple steps, and these operations would constitute multiple requests.

Thread means the number of requests the cloud can process at a time. In general, 3 threads would be enough for most apps to work smoothly.

Assuming that the response time of the cloud is 20 milliseconds, the cloud can process 1,000 / 20 = 50 requests on each thread every second.

For an app with 10,000 DAU, if each user generates 50 requests every day and all these users use the app within the same 2 hours on a day, there will be 10,000 × 50 / 2 / 60 / 60 = 69 requests happening in every second. Therefore, only 69 / 50 = 1.15 threads are needed to process all the requests happening in these 2 hours.

With the possible peaks considered, you should consider having certain redundancy in your app. For apps with Business Plans, 60 threads are provided by default. This should be sufficient for most use cases, but you can contact us to have it adjusted if needed.

For LeanStorage APIs, if more than 30,000 requests are made to an app on a day, further requests will be rejected with error code 429. The limit gets reset every day.

For Threads, if all 3 of them are occupied, further requests will be rejected with error code 429. The limit gets removed when at least one of them is freed up.

For Instant Messaging, when DAU reaches 500, users will not be able to log in. The limit gets reset every day.

For SMS and File Storage, both of them get charged according to actual usage. Apps with Developer Plans can use them without any restrictions.