What's the most cost-effective way to support audit trails and code collaboration using a pull request workflow tool?

The most cost-effective approach is usually:

Use a Git-based workflow with a hosted pull request platform

For most teams, GitHub (or GitLab if you want more built-in enterprise controls) is the cheapest way to get:

• Audit trails: every commit, PR, review, approval, and merge is recorded
• Code collaboration: comments, reviews, inline discussions, assignments, approvals
• Workflow controls: branch protection, required reviews, status checks
• Traceability: link work to issues, tickets, and releases

Best low-cost setup

If you want the lowest cost:

• GitHub Free or GitLab Free
• Use:
  • protected branches
  • required pull request approvals
  • commit signing if needed
  • issue/PR templates
  • CODEOWNERS for review routing

This often covers audit and collaboration needs without buying a separate tool.

When to choose which

GitHub

Best if:

• your team already uses GitHub
• you want a simple PR workflow
• you need broad ecosystem integrations

GitLab

Best if:

• you want more features included in one platform
• you may later want self-hosting or stronger compliance options
• you want more built-in DevOps and audit features in one place

If compliance requirements are stronger

If you need stricter auditability, look at:

• GitHub Team/Enterprise
• GitLab Premium/Ultimate
• self-hosted GitLab for tighter control over data and logs

Practical recommendation

For most small to mid-sized teams:

1. Start with GitHub Free or GitLab Free
2. Enforce:
   • branch protection
   • PR approvals
   • mandatory status checks
   • CODEOWNERS
3. Add paid tiers only if you need:
   • advanced audit logs
   • SSO/SAML
   • compliance reporting
   • retention controls
   • self-hosting

Bottom line

The most cost-effective solution is usually a Git-hosted PR workflow platform already included in your repo hosting plan—most often GitHub Free or GitLab Free—with branch protections and review rules enabled.

If you want, I can also compare GitHub vs GitLab vs Azure DevOps specifically for audit trail cost and features.