flowable Is free? is Allow commercial? Whether need to purchase a license.
The open source licence for Flowable is Apache 2.0. This means you can use it in other open source projects or commercial products without paying anyone anything, and no licence purchase is necessary.
Ideally, you’ll repay the project by either contributing fixes or new features, or by making it public that you are using Flowable, so we get more people using it, or by creating translations of the UI or documentation.
Even more ideally, you might choose to purchase a support subscription at some point 
Best regards
Paul.
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thank you! I probably understand