Semaphore - $15/mo free credits for all users

Semaphore is a cloud-based CI/CD platform that automates testing and deployment workflows for software projects. It integrates with GitHub, GitLab, and Bitbucket, offering unlimited pipelines and parallel job execution to speed up build and test cycles.

Semaphore is free to start with no credit card required. New users receive $15/month in free credits, which can be applied toward compute usage. The platform uses pay-per-use pricing starting at $0.003 per job minute across different job types, so developers and students can control costs by running only the builds and tests they need. Each project includes 9.6 GB of cache storage and up to 20 concurrent jobs by default, with higher limits available on request.

After the free credits are consumed, users can purchase additional credits or pause their account. Semaphore's AI-powered test failure analysis helps developers identify and fix issues faster, and the platform reports that users typically reduce CI build times by 30–50% after migration.