Izlo

Izlo is a team-oriented prompt management platform that treats LLM prompts like first-class engineering artifacts. It offers shared version history, a 'Remix' sandbox for iterating without touching production, automated test pipelines with variables, and an activity log so a team can see who changed what. A REST API lets engineers pull the latest production prompt at runtime, decoupling prompt iteration from app deploys.

It is aimed at small-to-mid product teams who have outgrown the 'prompts buried in Notion docs and Python string literals' phase and want a single source of truth that PMs, writers, and engineers can co-edit. Pricing starts at $20/mo Solo, $25/user/mo Pro (up to 10 users), and $39/user/mo Enterprise; each seat comes with a small monthly token allowance for in-app testing. There is no advertised free tier.

Izlo is model-agnostic infrastructure rather than a generation tool itself, so its value depends on how much prompt churn your team actually has. Competitors in this space include PromptLayer, Langfuse, and Helicone — Izlo's pitch leans more toward collaborative editing than observability.