Langtail is a no-code / low-code prompt management platform focused on collaborative prompt development, spreadsheet-like testing, multi-model experimentation, secure sandboxed assertions, and deployments as API endpoints. Key capabilities include an Excel/CSV-style test interface for running test cases across prompt versions and models with side-by-side comparisons; assertions and evaluation via string/regex checks, custom JavaScript assertions (running in a QuickJS sandbox), LLM-powered and human-like evaluations, and external API calls for RAG workflows. Langtail supports publishing prompts as versioned API endpoints with rollbacks, SDK and OpenAPI support, batching and streaming responses, and monitoring for usage, latency, and cost. Observability features include logs of real inputs/responses, configurable retention windows by plan, visualizations, and Radars & Alerts for anomalies and threats. Security and safety features highlighted include an AI Firewall for prompt-injection/DoS/data-leak protection, secure sandboxed code execution (partnership referenced with E2B), and an enterprise self-hosting option. Pricing includes a freemium Free plan and paid monthly tiers; VAT is listed separately on the pricing page. Documentation, a blog (including the Langtail 1.0 launch post), GitHub org, and community links (Discord invitation referenced in docs) are available.