Each server SDK you run will setup a streaming connection to our servers for realtime updates. We monitor how many connections there are every minute and aggregate across the month.

MAUs are estimated as: (Total MAU) * (Visits per MAU per month) * (Number of PageViews). We estimate conservatively with Visits/month = 30 and PageViews = 10. So if you have a site with 5k MAU and every user visited every day of the month and visited 10 pages triggering 10 requests that would be 5000 * 30 * 10 = 1.5M.

Yes, we offer a 60 day free trial. No credit card required. We want you to be sure that Prefab is right for you.

Yes, up to 5 server connections are free.

There are also minor charges on all API endpoints in order to prevent abuse. This looks like: $.001 / config update. We do everything we can to keep these minimal.

Keep your logging as is. Keep your log aggregator and pipelines as they are. Prefab slots into your existing logging infrastructure. Prefab simply makes the 'should I log' step of the logging library dynamically updatable and context aware. Your logs do not go to Prefab. This is why Prefab can be so effective at helping you save on logging costs.

It's up to you, but savings can be dramatic. Typically, the bulk of logging charges come from INFO and DEBUG level logs. You could set production to only log WARN and that is hopefully pretty quiet, but then you have very little detail to help you investigate issues. For this reason, many systems end up outputting at INFO. It's not unusual for this to increase logging volume 10x. Prefab allows you to keep the level at WARN, until you need it, then quickly turn it to DEBUG for an hour. In this example you could save almost 90% on your logging bill.

The server SDKs will all download the configuration and then evaluate it as many times as they want. Mobile and web clients won't download the config itself, because that could leak information like your customer IDs. Instead, they'll ask the server to evaluate the feature flags for each request. If you have huge volume, let's talk about setting up a proxy.

Very possible, let's talk. Hit us up on chat.