Mainline vs Amp (2026)

Mainline

by Mainline

Amp

by Sourcegraph

Pros

• ✓Git-native storage means repo memory travels with the codebase through normal Git fetch and push: no vendor lock-in, no third-party cloud dependency, and no additional infrastructure beyond existing Git workflows.
• ✓Hooks auto-inject intent context at every Cursor, Claude Code, and Codex session start: agents see abandoned paths and superseded decisions before making changes, eliminating the manual step of providing historical context.
• ✓Apache-2.0 open source core is free for all developers with the full CLI, agent protocol, and intent record format available without a paid tier or account requirement.

Limitations

• ⚠Team collaboration features (shared Hub, hosted intent sync, PR review integration, policy controls) are not yet released: the current product is a solo and early-team CLI only, limiting utility for larger engineering organizations.
• ⚠Not a coding agent: Mainline is a context and memory layer that must be paired with a separate coding agent such as Cursor or Claude Code; teams expecting AI-driven code generation will not find that here.
• ⚠Very early product with 180 GitHub stars and no G2 reviews: teams evaluating long-term infrastructure tools carry meaningful adoption risk compared to established alternatives with larger communities.

Pros

• ✓Frontier-first design with unfettered token and tool access: Amp optimizes for output quality rather than minimizing cost, running multi-step threads, subagents, and remote agents that users frequently rate above Claude Code, OpenAI Codex, and Cursor.
• ✓Transparent pay-as-you-go pricing with zero markup: individuals and non-enterprise workspaces pay only pass-through LLM and tool costs from a $5 minimum, with an Amp Free tier and no subscription or commitment.
• ✓Meets developers in place across CLI, VS Code, Cursor, and Windsurf with MCP client support and a plugin system: no new UI to learn, and agents extend through local or remote MCP servers and custom subagents.

Limitations

• ⚠Usage-based pricing makes spend less predictable than per-seat subscriptions: because Amp deliberately spends tokens freely for better results, costs scale with consumption and heavy multi-agent use can add up quickly.
• ⚠Proprietary with no open-source or self-hosted edition: teams wanting a forkable, auditable agent they run on their own infrastructure cannot use Amp, unlike open-source alternatives.
• ⚠Terminal-centric with thin non-G2 signal: Amp is strongest for developers comfortable in the CLI, and independent validation outside its 91 G2 reviews (for example Product Hunt) remains limited for a product this new.