Humanloop
AI development platform for prompt engineering, evaluation, and optimization with human feedback loops and collaborative workflows
Overview
Humanloop is an AI development platform that enables teams to build, evaluate, and improve LLM-powered features through collaborative prompt engineering and human-in-the-loop feedback. Founded in 2020 by former Spotify ML engineers and Google DeepMind researchers, Humanloop provides a unified workspace for prompt versioning, A/B testing, automated evaluations, and production monitoring. The platform emphasizes iterative improvement through structured feedback collection from end users and domain experts. Humanloop is used by companies including Gusto, Duolingo, Calm, and others building production AI applications.
The Verdict
Who Should Use Humanloop?
Best For
- Product teams iterating on AI features rapidly
- Enterprises needing prompt versioning and governance
- Teams collecting human feedback for improvement
- Organizations requiring SOC 2 compliance
- Non-engineers collaborating on prompt development
Not Ideal For
- Teams needing self-hosted solutions (cloud-only)
- Pure observability use cases (Langfuse better)
- Simple single-prompt applications
- Budget-constrained startups (premium pricing)
- Open source purists (proprietary platform)
What's Great
- Intuitive prompt editor with side-by-side comparison
- Built-in human feedback collection workflows
- Prompt versioning with full audit trail
- Model-agnostic - works with OpenAI, Anthropic, Google, etc.
- Collaborative workspace for technical and non-technical users
- Automated evaluation pipelines with custom metrics
- Production deployment with feature flags
- Enterprise security (SOC 2 Type II)
Watch Out For
- No self-hosted option available
- Premium pricing compared to open source alternatives
- Learning curve for full platform utilization
- Limited tracing depth vs dedicated observability tools
- Smaller community than LangChain ecosystem tools
Pricing
View all features & details
Core Features
- Visual prompt editor with playground
- Prompt versioning and diff comparison
- A/B testing and experiment management
- Human feedback collection widgets
- Automated evaluation pipelines
- Production logging and monitoring
- Feature flags for prompt deployment
- Cost and latency tracking
Model Support
- OpenAI (GPT-4, GPT-3.5)
- Anthropic (Claude 3.x)
- Google (Gemini, PaLM)
- Cohere (Command)
- Azure OpenAI
- Amazon Bedrock
- Custom/Self-hosted models
- Multi-model routing
Integrations
- Python SDK
- TypeScript/Node.js SDK
- REST API
- LangChain integration
- Webhook notifications
- Slack integration
- Zapier automation
Security & Compliance
- SOC 2 Type II certified
- GDPR compliant
- SSO (Enterprise)
- Role-based access control
- Audit logging
- Data encryption at rest/transit
How It Compares
| Feature | Humanloop | PromptLayer | Langfuse |
|---|---|---|---|
| Primary Focus | End-to-end prompt dev | Prompt versioning | Observability |
| Human Feedback | Built-in workflows | Basic | Annotations |
| Prompt Editor | Visual, collaborative | Visual | Basic |
| Self-Hosted | No | No | Yes (OSS) |
| Open Source | No | No | Yes |
| Evaluations | Automated + human | Basic | LLM-as-judge |
| Free Tier | 1K logs/mo | 10K requests | 50K obs/mo |
| Model Support | All major providers | All major providers | All major providers |
| Best For | Product teams, enterprises | Simple versioning | Full data control |
| Starting Price | $200/mo | $19/mo | $0 (self-host) |