Langtail
LangTale is a platform designed to streamline the management of Large Language Model (LLM) prompts, allowing teams to collaborate more effe...
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What is Langtail?
Langtail is the leading prompt management platform that empowers product teams to build, test, and deploy AI prompts with confidence. It provides a spreadsheet-like interface for managing LLM prompts that is easy for everyone - if you can use spreadsheets, you can manage prompts with Langtail without coding required. The platform streamlines your AI workflow from ideation to production with collaborative prompt engineering tools.
Key features include comprehensive prompt control to build, test, and validate prompts with natural language evaluation, pattern matching, or custom code. Langtail offers robust testing capabilities with assertions (text, JavaScript, and LLM-based), test configurations for side-by-side model comparisons, and the ability to test prompts calling tools with secure code execution powered by QuickJS. The platform includes AI Firewall for blocking prompt injections, DoS attacks, and information leaks with one-click setup and instant AI alerts. Additional features include playground for rapid prototyping, deployments as API endpoints, logs and metrics for data-driven insights, version control, assistants for stateful memory management, and public shareable apps.
Langtail is designed for engineering and AI teams, including product, engineering, and business teams - not just for developers. It works with all major LLM providers including OpenAI, Anthropic, Gemini, Mistral, and many more. The platform offers TypeScript SDK with built-in code completion and OpenAPI support. Teams can self-host for maximum security and data control, making it essential for reliable, collaborative AI app development.
Langtail pricing
Pricing model: Free
Free: $0/month + VAT - Unlimited users, 2 prompts or assistants, 1,000 logs per month, 30 days data retention, public shareable apps. Pro: $99/month + VAT - 1 user, 20 prompts or assistants, unlimited logs, 90 days data retention, public shareable apps. Team: $499/month + VAT (most popular) - 10 users, unlimited prompts or assistants, unlimited logs, 1 year data retention, public shareable apps, Radars & Alerts, dedicated support. Enterprise: Custom pricing - Unlimited users, unlimited prompts or assistants, unlimited logs, custom data retention, public shareable apps, Radars & Alerts, AI Firewall, dedicated support, self hosting.
Langtail pros
- Spreadsheet-like interface accessible to non-coders
- No coding required for prompt management
- Unlimited users on all plans including Free
- Comprehensive testing with text, JavaScript, and LLM assertions
- Test configurations for side-by-side model comparisons
- AI Firewall blocks prompt injections and DoS attacks
- One-click AI Firewall setup with minimal configuration
- Secure code execution powered by QuickJS sandbox
- Assistants automatically manage memory and conversation history
- Deploy prompts as API endpoints seamlessly
- TypeScript SDK with built-in code completion
- Works with OpenAI, Anthropic, Gemini, Mistral
- Self-hosting option for enterprise security
- Public shareable apps for collaboration
- Radars & Alerts for monitoring on Team plan
- Visualizations for prompt performance insights
- 30-90 days data retention on lower plans
- JavaScript assertions for custom validation logic
Langtail cons
- Free plan limited to only 2 prompts or assistants
- Free plan has only 1,000 logs per month
- Free plan only 30 days data retention
- Pro plan limited to 1 user only
- Pro plan only 20 prompts or assistants
- Pro plan has 90 days data retention
- Team plan at $499/month is expensive for small teams
- AI Firewall only available on Enterprise plan
- No free trial mentioned beyond Free plan
- Budget limits require manual API key configuration
Frequently asked questions about Langtail
What is Langtail and what does it do?
Langtail is the leading prompt management platform that empowers product teams to build, test, and deploy AI prompts with confidence. It provides a spreadsheet-like interface for managing LLM prompts that allows teams to collaborate effectively, gain deeper understanding of their AI's workings, and streamline their AI workflow from ideation to production.
Is Langtail only for developers?
No, Langtail is not just for developers. It is designed to be simple to use for everyone across product, engineering, and business teams. If you can use spreadsheets, you can manage prompts with Langtail - no coding required.
What LLM providers does Langtail support?
Langtail works with all major LLM providers including OpenAI, Anthropic, Gemini, Mistral, and many more LLM providers, making it versatile for different AI infrastructure needs.
How does Langtail's testing feature work?
Langtail provides a spreadsheet-like interface for testing where you can create test cases, add assertions (text, JavaScript, or LLM-based), and run tests with multiple configurations. You can create assertions that check for specific content, run JavaScript code for custom validation, or use LLMs for natural language evaluation. Test configurations allow side-by-side model comparisons.
What is AI Firewall and what does it protect against?
AI Firewall is a security feature that protects AI apps from prompt injection attacks and other security vulnerabilities. It prevents prompt injections, DoS attacks, and information leaks with one-click setup, comprehensive security, advanced safety checks, and instant AI alerts for potential threats and unusual activities.
What are Assistants in Langtail?
Assistants are stateful entities in Langtail 1.0 that automatically manage memory and conversation history, so you don't have to write and maintain that code. This means less code to write and maintain, and more focus on building. Assistants can be used across models, in tests, deployed as APIs, or integrated with tools.
Can I deploy my prompts as API endpoints?
Yes, Langtail allows you to deploy prompts as API endpoints. From the Playground, you can save your prompt and select Deploy to deploy it to staging environment or production. You generate a project API key from the Secrets section and integrate it with your application using the TypeScript SDK or OpenAPI.
What is the difference between Free and Pro plans?
The Free plan ($0/month) includes unlimited users, 2 prompts or assistants, 1,000 logs per month, and 30 days data retention. The Pro plan ($99/month) includes 1 user, 20 prompts or assistants, unlimited logs, and 90 days data retention. Both plans include public shareable apps.
Does Langtail offer self-hosting for security?
Yes, Langtail offers self-hosting for maximum security and data control. This feature is available on the Enterprise plan with custom pricing, which provides unlimited users, unlimited prompts/assistants, unlimited logs, custom data retention, Radars & Alerts, AI Firewall, dedicated support, and self hosting.
What are Radars & Alerts and which plan includes them?
Radars & Alerts are monitoring and alerting features for tracking prompt performance and receiving notifications. They are included on the Team plan ($499/month) and Enterprise plan (custom pricing), but not on Free or Pro plans. These features help teams monitor their deployed prompts' performance and usage with data-driven insights.