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Side-by-side features, use cases and pricing — because the right pick depends on your job and budget, not just the ranking.

Arize AI logo
Arize AI
✓ verifiedFreemium

AI observability and evaluation platform to trace, evaluate and improve LLM agents in production, with an open-source Phoenix core.

248K visits/mo
Openlayer logo
Openlayer
✓ verifiedFreemium

AI governance and observability platform with 100+ automated tests and real-time guardrails to evaluate and monitor ML/LLM systems.

24K visits/mo
Helicone logo
Helicone
✓ verifiedFreemium

LLM observability platform and AI gateway that lets teams route, log, debug and analyze their model requests.

100K visits/mo
MuleRun logo
MuleRun
✓ verifiedFreemium

Always-on cloud AI agent that runs multi-step workflows and monitoring on a dedicated 24/7 VM to automate business tasks.

908K visits/mo
Verdent logo
Verdent
✓ verifiedFreemium

Credit-based AI coding agent that builds full applications from plain-language instructions, including backend, billing, and admin features.

1.0M visits/mo39K saves
Pricing
AX Free: $0/mo (25k spans/mo)
AX Pro: $50/mo (50k spans/mo)
Basic: Free (20k inferences/mo, 1 member, 5 projects)
Hobby: Free (10,000 requests/mo)
Pro: $79/mo (unlimited seats)
Team: $799/mo (SOC-2 & HIPAA)

Free trial available

Free: $0 (200 daily bonus credits, 10 tasks)
Plus: $16/mo (2,000 credits/mo)
Super: $32/mo (4,500 credits/mo)
Pro: $160/mo (23,000 credits/mo)
Starter: $19/mo (480 credits/mo including bonus)
Pro: $59/mo (1,500 credits/mo including bonus)
Max: $179/mo (4,500 credits/mo including bonus)
Teams: $20/user/mo (480 credits/user/mo)

Free trial available

Core features
  • Agent and LLM tracing
  • Large-scale evaluations
  • Open-source Phoenix observability
  • Alyx AI engineering agent
  • OpenTelemetry-based instrumentation
  • Experiments and prompt playgrounds
  • 100+ automated AI tests
  • Offline evaluation and CI/CD for AI
  • Real-time observability and tracing
  • Guardrails against PII leaks, injection, hallucination
  • Data-quality and drift monitoring
  • Compliance/governance alignment
  • Git, SDK, CLI and REST API integration
  • Request logging and LLM observability
  • AI gateway with routing and automatic fallbacks
  • Caching and rate limiting
  • Session, user and custom-property analytics
  • Prompts, playground and datasets for testing
  • Integrations with OpenAI, Anthropic, Azure and more
  • Always-on agent on a dedicated 24/7 VM
  • Multi-step task automation (docs, PPT, video, research)
  • Proactive monitoring with alerts and actions
  • Shared/self-improving agent knowledge network
  • Page deployment and drive storage
  • Builds complete apps (auth, storage, payments, admin) from natural-language prompts
  • Runs on top of multiple frontier coding models
  • Retains full project context across sessions for incremental feature additions
  • Remote task submission via Slack/Telegram messaging
  • 'Eco Mode' for lower-cost usage without consuming credits
  • VS Code and JetBrains IDE integrations plus a desktop app
Use cases
  • Debugging AI agents in production
  • Measuring LLM output quality
  • Catching regressions before deploy
  • Evaluate models before production
  • Monitor live AI systems for issues
  • Prevent unsafe or non-compliant outputs
  • Catch data drift and quality problems
  • Monitoring and debugging LLM apps
  • Analyzing model usage and cost
  • Caching responses to cut spend
  • Managing prompts and testing datasets
  • Automating recurring business workflows overnight
  • Generating reports, documents and presentations
  • Monitoring uptime, pricing or metrics with auto-actions
  • Running research and content tasks hands-off
  • Solo founders building a launchable product without a dev team
  • Developers offloading multi-step feature builds to an autonomous agent
  • Teams wanting a shared coding agent with pooled usage billing
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