Free and open first
Best Model Monitoring Software in 2026
Monitoring software helps you track how models behave after deployment, including changes in data and performance. Compared on drift detection, bias monitoring, data quality monitoring, and performance monitoring, these entries also provide details on deployment options and monitored model limit. Consider free plans and paid-from pricing as part of the operational fit. Evidently AI, OpenLIT, and W&B Weave are among the options shown. The listed criteria can help you focus on the signals you need to monitor and the deployment arrangements that suit your work.
- 24 apps
- Research read 23 Sept 2026
- How the order is worked out
- 1
Deepchecks
Free plan Open source APILinuxMac+2 - 2
Evidently AI
Free plan Open source APILinuxMac+3Evidently AI covers evaluation, tracing, synthetic data and ongoing monitoring across AI and ML workflows. Review plan limits and support levels against the scale and deployment option you need.
- 3
Langfuse
Free plan Open source APILinuxSelf-hosted+1Langfuse brings tracing, prompt workflows, and evaluation features into one AI engineering platform, with both hosted and self-hosted options.
- 4
LangWatch
Free plan Open source APILinuxMac+2LangWatch brings agent simulation, evaluation, tracing, and deployment options together for teams working toward production.
- 5
Lunary
Free plan Open source APISelf-hostedWebLunary combines LLM observability with analytics, prompt management, and response evaluation.
- 6
NannyML
Free plan Open source APILinuxSelf-hosted+1NannyML combines drift monitoring with estimates of model performance and business impact. Check the deployment and backup details, as well as plan limits, against your monitoring requirements.
- 7
OpenLIT
Free plan Open source APILinuxMac+3Choose OpenLIT if you want LLM tracing, evaluations, prompt tools, and cost tracking, with the option to self-host under an Apache 2.0 license.
- 8
Opik
Free plan Open source APILinuxMac+3Opik brings tracing, evaluation, testing, and production monitoring into one platform, with both cloud and self-hosted options.
- 9
W&B Weave
Free plan Open source APIiPhoneLinux+4W&B Weave brings tracing, evaluation, monitoring, and safety scoring together for production AI agents.
- 10
Arize AX
Free plan APISelf-hostedWebArize AX combines tracing, evaluations and experiments with tools for investigating agent failures.
- 11
Arize Phoenix
Free plan APISelf-hostedWebPhoenix brings tracing, evaluation, prompt inspection, and dataset experiments to AI application teams. It is free and open source, with deployment choices and usage management left to users.
- 12
Arthur
Free plan APISelf-hostedWebArthur combines agent discovery, observability, and policy controls with hosted, on-premises, and hybrid deployment choices.
- 13
Braintrust
Free plan APISelf-hostedWebBraintrust combines production trace inspection with dataset evaluations and prompt iteration.
- 14
Fiddler AI
Free plan APISelf-hostedWeb - 15
Galileo
Free plan APISelf-hostedWebGalileo combines evaluation, observability, and guardrails with several deployment options and developer interfaces. Check the trace allowance and SSO availability against your deployment needs.
- 16
Helicone
Free plan APISelf-hostedWebHelicone brings routing and observability tools together, with a free tier and self-hosting options. Its maintenance-mode status is worth weighing when considering it for a new deployment.
- 17
LangSmith
Free plan APILinuxMac+3LangSmith combines agent evaluation with prompt tools and observability, including cost and trajectory tracking.
- 18
HoneyHive
Free plan APISelf-hostedWebHoneyHive covers trace inspection, evaluations, live monitoring, and version experiments for AI agents. Teams should compare the free plan’s limits with their event volume and retention needs.
- 19
Laminar
Free plan APISelf-hostedWebChoose Laminar if you need OpenTelemetry-native tracing and debugging for AI agents, with evaluations and cloud or self-hosted deployment options.
- 20
Memoturn
Free plan APILinuxSelf-hosted+1Memoturn combines LLM observability and evaluation with prompt management, access controls, and self-hosted deployment choices.
- 21
Maxim AI
Free plan APISelf-hostedWebMaxim AI brings prompt work, agent evaluation, and production observability into one platform.
- 22
Qualdo-MQX
Free plan APISelf-hostedWebQualdo-MQX covers several model types and tracks drift, performance changes, and data quality. Check the input dataset requirements and plan limits against your monitoring setup.
- 23
Pulsar
Free plan APISelf-hostedChoose Pulsar if you need a free, open-source option for monitoring production model drift and performance, with alerts and Grafana visualisation.
- 24
SUPERWISE
Free trial APIExtensionLinux+4Choose SUPERWISE if your AI team needs governance controls alongside agent development, monitoring, and deployment flexibility.
#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price
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