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Jern Cloud vs Langtail

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Jern Cloud compared with Langtail
DetailJern Cloud logo Jern CloudLangtail logo Langtail
What it doesCloud coding agent for GitHub that runs your tests before and after, and opens pull requests with receipts Prompt management platform for building, testing, and deploying AI prompts collaboratively
StageNot given Not given
FoundedNot given 2023
Based inNot given CZ
Pricing modelFreemium Not given
PricingFree trial: 30 days with $5 of inference included, no card required. Paid: $19 per workspace per month (billed after trial ends). Free plan: $0/month with unlimited users, 2 prompts or assistants, 1,000 logs per month, 30 days data retention. Pro: $99/month + VAT for 1 user, 20 prompts or assistants, unlimited logs, 90 days data retention. Team: $499/month + VAT for 10 users, unlimited prompts or assistants, unlimited logs, 1
Key features
  • Runs tests before and after changes
  • Detailed receipts showing what changed and cost
  • Scheduled campaigns with budget caps and safety limits
  • No setup required, no API keys to start
  • Supports Python, Node, .NET, and Java
  • Network proxy blocks private addresses
  • Policy enforcement with configurable access
  • Spreadsheet-like interface for managing prompts with no coding required
  • Natural language evaluation, pattern matching, and custom code testing
  • Experiment with models and parameters to optimize prompts
  • Data-driven insights from prompt performance and user interactions
  • AI Firewall preventing prompt injections and DoS attacks
  • Support for multiple LLM providers
  • TypeScript SDK and OpenAPI support
  • Self-hosting option for maximum security
What makes it different
  • Transparent receipts with provider request IDs instead of vendor black boxes
  • Open source runtime that runs the same agent locally
  • Use your own provider key with metered usage
  • Never merges—you control all pull request acceptance
  • Prevents unpredictable LLM outputs through proper prompt management and testing
  • Non-technical teams can manage prompts with intuitive spreadsheet interface
  • Built-in AI Firewall for security and safety of AI outputs
  • Works seamlessly with all major LLM providers
Community votes00
DR (Domain Rating by Ahrefs)6 +1 (up) since last check29 no change since last check
Trust Flow (Majestic)86
Citation Flow (Majestic)1434
Referring domains (Majestic)16275

4 details filled in for both companies.

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