MainSDK
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Pricing

What is free forever, what is paid and who qualifies for free use as an open-source project.

Planned for 0.5

Status Status is where the work is: Planned (in a milestone, not started), Building (tickets in progress), Preview (usable, may change), then the stability it ships at.

Stability The promise an interface ships with.

  • Stable Follows semantic versioning; breaking changes need a new major, 12 months of overlap and a codemod.
  • Beta Usable in production; may change before it becomes stable.
  • Experimental May change or go away; needs an explicit opt-in in main.yaml.
Stability levels
Updated 2026-10-28
WhatCost
Every in-app capability: interfaces, local drivers, the CLI, checks that run in your repositoryFree, Apache-2.0
Open-source projectsFree forever
Hosted checks and fleet reports for teams (MainSDK Cloud)Paid; priced when it opens

Open-source eligibility. An open-source project gets MainSDK free forever when its repository is public, its licence is approved by the Open Source Initiative, and it is not run for profit by a company. You write one line in your README that says you use MainSDK. There is nothing to apply for and no limit on users.

Details are on the open-source page.

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