What is evidently?

evidentlyai/evidently — explained in plain English

Analysis updated 2026-06-24

★ 7,490Jupyter NotebookAudience · dataComplexity · 3/5LicenseSetup · easy

Mindmap

mindmap
  root((Evidently))
    Evaluation
      Reports
      Test Suites
      100 plus checks
    What it monitors
      Data drift
      Model accuracy
      LLM output quality
    Output formats
      Jupyter notebook
      HTML report
      JSON export
    Deployment
      Self-hosted dashboard
      Evidently Cloud
      Free tier available

mindmap root((Evidently)) Evaluation Reports Test Suites 100 plus checks What it monitors Data drift Model accuracy LLM output quality Output formats Jupyter notebook HTML report JSON export Deployment Self-hosted dashboard Evidently Cloud Free tier available

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What do people build with it?

USE CASE 1

Monitor whether your production ML model's predictions are drifting as new real-world data comes in over time.

USE CASE 2

Evaluate whether your LLM chatbot responses are too short, too negative, or refusing requests they should answer.

USE CASE 3

Generate an HTML data quality report before deploying a new model version to catch problems early.

USE CASE 4

Set up a live monitoring dashboard to track AI system health metrics across real user traffic over time.

What is it built with?

PythonJupyter Notebookpip

How does it compare?

	evidentlyai/evidently	coells/100days	h2oai/h2o-3
Stars	7,490	7,489	7,478
Language	Jupyter Notebook	Jupyter Notebook	Jupyter Notebook
Setup difficulty	easy	easy	hard
Complexity	3/5	1/5	4/5
Audience	data	developer	data

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · easy Time to first run · 30min

Open source, free to use and modify, including for commercial purposes.

So what is it?

Evidently is an open-source Python library for evaluating and monitoring AI systems. If you have built a machine learning model or a chatbot powered by a large language model, Evidently gives you tools to check whether your system is behaving correctly, both during development and once it is running in production. The library works in two main ways. First, you can run Reports and Test Suites: you feed in your data and outputs, and Evidently calculates metrics like whether your data quality has changed, whether a model's predictions are drifting over time, or whether an AI assistant is giving responses that are too short, too negative, or likely denying requests it should answer. Over 100 built-in checks cover classification accuracy, recommendation diversity, text sentiment, and many more. You can view results interactively in a Jupyter notebook or export them as HTML or JSON for sharing. Second, Evidently includes a monitoring dashboard that tracks these metrics over time as your system handles real users. You can run the dashboard yourself on your own machine or sign up for a hosted version called Evidently Cloud, which adds alerting, team management, and other extras on top of a free tier. The library installs with a single pip command and is designed to be modular. You can start with a one-line preset that catches common problems in tabular data, then layer in custom metrics as you learn more about what your specific system needs to track. Evidently is developed by Evidently AI, the company behind it, and is open source under a public license. It is aimed at data scientists and ML engineers who want to catch problems in AI systems before or after they reach users, without having to build monitoring infrastructure from scratch.

Copy-paste prompts

Prompt 1

Using Evidently, write Python code that compares my training dataset to a week of production data and generates an HTML report showing which features have drifted the most.

Prompt 2

How do I set up Evidently to monitor my LLM chatbot for response quality issues like denial rate, average sentiment, and response length in a production environment?

Prompt 3

Write a Python script using Evidently Test Suites that automatically fails a CI pipeline check if my classification model's F1 score drops more than 5% from baseline.

Prompt 4

Show me how to run the Evidently monitoring dashboard locally to track model accuracy over time as batches of new predictions come in.

Frequently asked questions