Pick Lavender if…
- You need real autonomous-agent capability (plan + execute multi-step tasks), not just chat.
- You want the cheaper option (starts at $29/mo, Seamless.ai starts at $147/mo).
- You specifically need Email score or AI rewriter, which Seamless.ai doesn't ship.
- Your primary use case is Cold email writing or Email coaching — Seamless.ai doesn't list this.