Evidently AI alternatives

3 tools to consider instead of Evidently AI, shown against it.

Evidently AI Arize AI WhyLabs Fiddler AI
Vendor Evidently AI, Inc. Arize AI, Inc. WhyLabs, Inc. (discontinued operations in 2025; codebase open-sourced) Fiddler AI, Inc.
Pricing model Free tier + paid plans Free tier + paid plans Open source + paid options Usage-based
Free tier Yes Yes Yes Yes
Deployment Cloud, Self-hosted Cloud, Self-hosted Self-hosted Cloud, Self-hosted
Open source Yes (Apache-2.0) No Yes (Apache-2.0) No
Best for Teams needing open-source-first drift and data-quality monitoring for deployed ML or LLM systems. AI-native teams needing unified monitoring across both predictive ML models and LLM applications. Developers who want the open-sourced whylogs/LangKit libraries rather than a supported commercial platform. Teams needing both monitoring and real-time safety guardrails for LLM/agent applications in production.
Pricing

The open-source library and self-hosted platform are free; Evidently Cloud has paid tiers, but no self-serve figures were shown on the vendor's pricing page in this session, and higher tiers are sold via sales conversation.

Checked on the vendor's own page on September 21, 2026: no prices are published. Expect to be quoted.

Free tier covers a limited number of trace spans and issues per month; Pro is a flat monthly rate with higher caps; Enterprise is custom-quoted with unlimited volume and choice of SaaS or self-hosted deployment.

AX Free $0
AX Pro $50/month
AX Enterprise Custom

Prices read from the vendor's own page on September 21, 2026. Vendors change prices; check the source before you budget.

The commercial WhyLabs platform has been discontinued; only the open-source whylogs and LangKit libraries remain, and they are free.

Pricing has not been verified yet — see the vendor's site.

A free tier covers basic real-time guardrails; the Developer tier is billed per trace; Enterprise adds flexible deployment and support and is custom-quoted.

Free $0
Developer $0.002 per trace
Enterprise Custom

Prices read from the vendor's own page on September 21, 2026. Vendors change prices; check the source before you budget.

Features
  • Data and target drift detection
  • Data-quality checks and test suites
  • Model performance monitoring over time
  • LLM output evaluation (hallucination, toxicity, relevance)
  • Pre-built HTML/JSON reports and dashboards
  • CI/CD integration for automated checks
  • Open-source core with a hosted Cloud dashboard
  • Production drift and data-quality monitoring
  • LLM/agent tracing and evaluation
  • Human annotation workflows
  • Root-cause and issue detection
  • Experiment comparison for model/prompt versions
  • Self-hosted and SaaS deployment options
  • Alerting and dashboarding
  • Statistical data profiling without storing raw data (whylogs)
  • Data and concept drift detection
  • LLM input/output monitoring (LangKit)
  • Anomaly detection on production data
  • Lightweight, open-source logging library
  • No hosted commercial dashboard (discontinued)
  • Production drift and performance monitoring
  • Real-time LLM guardrails (hallucination, toxicity, PII/PHI, prompt injection)
  • Model explainability tooling
  • Agentic and predictive-system observability
  • Custom evaluators / bring-your-own-judge
  • Role-based access control and SSO
  • VPC and on-premises deployment options

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