What is Langtail?

Langtail is a prompt‑management platform for product and engineering teams that lets users create, test, and deploy AI prompts without writing code. The interface resembles a spreadsheet, enabling anyone familiar with tables to organize prompts, variables, and responses.

Built‑in evaluation features support natural‑language scoring, pattern matching, and custom scripting to validate prompt outputs. The tool integrates with major LLM providers such as OpenAI, Anthropic, Gemini, and Mistral, allowing users to experiment with different models and parameters.

It includes an AI firewall that blocks prompt injections, denial‑of‑service attempts, and data leaks, and delivers alerts for anomalous activity. Langtail offers a TypeScript SDK and OpenAPI specification for programmatic access and can be self‑hosted for maximum data control.

Langtail on the web:

Langtail details

Company: LANGTAIL.COM s.r.o.
Jurisdiction: Czech Republic
Built for: Individuals

Langtail tech specs

Works with: OpenAI / GPT Anthropic / Claude Google / Gemini Mistral

Langtail pricing

Freemium

Free $0

Pro $99

Team $499

Enterprise custom

Verify on the official pricing page.

View plans

Langtail's key features

Collaborative prompt development
Spreadsheet-style prompt interface
No-code prompt editing
Built-in performance analytics
One-click AI firewall
Multi-provider LLM support
Self-hosting data control

Langtail use cases

Create a centralized, no-code prompt repository for customer support agents, enabling quick testing and deployment of response templates across multiple channels with built‑in evaluation metrics.
Implement a prompt firewall and role‑based access controls in a self‑hosted environment to safeguard sensitive data while monitoring performance analytics for enterprise AI workflows.
Track and optimize prompt performance across multiple models in a spreadsheet dashboard, allowing data scientists to iteratively refine prompts based on real‑time usage metrics.