Mergify

Mergify solves one specific problem this category otherwise leaves to GitHub or GitLab's own tooling: batching and testing pull requests before they land on the main branch, so a team with a busy repository stops discovering that two individually-green PRs break the build together. It layers on top of GitHub or GitLab rather than replacing either, adding a merge queue plus CI Insights and Test Insights that surface which checks are actually slowing a team down.

The Toulouse company publishes its pricing in full: a free plan for up to five active users, an Open Source plan that's free and unlimited for public repositories, a Max plan at $21 per seat per month with a 15% discount for annual billing, and Enterprise quoted separately. An "active" user is anyone who opened a PR or pushed a commit in the last 30 days, so idle accounts and bots don't count against the bill.

Mergify doesn't host code or run builds itself — it depends entirely on GitHub or GitLab already being in place, so it's an addition to this category's forges rather than an alternative to any of them. For a team whose main branch keeps breaking despite individually passing pull requests, that's a narrow, well-priced fix; for a team without that specific pain, it's one more subscription to justify.

What Mergify does well

• Merge queue prevents individually-green PRs breaking main together
• Free plan for up to 5 active users
• Free, unlimited Open Source plan for public repositories
• Full published pricing, including the per-seat rate
• CI Insights and Test Insights included, not a separate add-on

Where Mergify falls short

• Only works on top of GitHub or GitLab, not standalone
• Doesn't host code or run builds itself
• Per-seat pricing on the Max plan adds up for larger teams
• Narrow scope compared with a full CI/CD platform

Standout feature. A merge queue that only exists to stop two green pull requests breaking main the moment they land together.