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Evidential

Find out what works and improve your programs faster.

Evidential is a free, open-source experiment engine built by and for nonprofits. Create, run, and learn from rigorous experiments with hands-on support at every step.

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What it is and how it works

What it is?

A free, open-source experiment engine that puts rigorous, rapid learning in every nonprofit’s hands.

Why it matters?

Nonprofits are hungry for evidence, but most teams lack the technical or financial bandwidth to test ideas quickly.

 

A new experiment engine for the social sector

Learn more about how we are helping nonprofits run their own experiment

How it works?

Connect your data source - Design the experiment - Right-sized random assignment - Real-time results - Clean dataset and lessons in one dashboard

Ideas our partners have tested:

  • Does a personalised AI response improve engagement?
  • Does a casual tone lift completion for younger users?
  • Does asking fewer onboarding questions reduce drop-off?
  • When is the best time to message users?

Why Evidential

Plenty of tools can run an A/B test. Almost none are built for how nonprofits actually work, i.e measuring real program outcomes across WhatsApp, IVR, in-person delivery, etc. Evidential is:

Built for the social sector: The roadmap is steered by mission-driven orgs.

Impact-first metrics: Measures behaviour change and program outcomes, not vanity clicks.

Made for continuous experimentation: Set it up once, then experiment indefinitely.

Multiple methods: Frequentist A/B, Bayesian, and multi-armed & contextual bandits.

 Data Privacy: Your data is kept on your own infrastructure.

 

How Evidential compares

Category (examples) Built for Typically measures Assumes you have
Product & web experimentation (Optimizely, VWO, Statsig, GrowthBook) Software product & growth teams Clicks, sign-ups, conversions In-house engineers; often enterprise budgets
Messaging & chatbot A/B tools (Intercom, WATI, Gupshup) Marketing teams, single channel Opens, clicks, engagement A marketing/ops team
Product analytics (Mixpanel, Amplitude) Product teams analysing apps Usage & funnels (not experiments) A product + engineering team and budget
Traditional RCTs One-off impact studies Causal impact on outcomes Researchers, enumerators, months, and funding
Evidential Nonprofits improving live programs Behaviour change & program outcomes Just a healthy appetite for experimentation

Evidential isn’t a product-analytics tool or a setup for one-off, full-scale RCTs. It’s for continuously improving complex programs with rigour, at a fraction of the cost and time.

What Evidential can do

Everything you need to run rigorous experiments, in one place.

Experiment types and methods

Built-in statistics

Data and integrations

Manage and learn

Interested in using Evidential?

Our team can help identify potential use cases for you.

Reach out to us by filling this form

Documentation   Getting started guide   GitHub   Contact us