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PropEr

Free#7 of 27 in Property-Based Testing Tools

PropEr: A focused Erlang tool for generated properties, stateful models, and smaller failure cases. Ranked #7 of 27 in Property-Based Testing Tools by our editors (8.7/10); pricing: Free plan; best for erlang teams testing stateful systems.

8.7/10★★★★☆Editor score

Visit PropEr

At a glance

• Editor score
  8.7 / 10
• Pricing
  Free plan
• Best for
  Erlang teams testing stateful systems
• Free plan
  Yes
• Paid from
  Free
• Supported languages
  Erlang
• Facts checked
  23 Sep 2026

• Where it wins

  • Generates inputs from PropEr types and native Erlang types
  • Tests stateful systems with generated command sequences
  • Attempts to shrink failures and supports targeted testing

• Where it doesn't

  • Supports Erlang rather than a range of programming languages
  • Requires a self-hosted deployment
  • Support is community-based

Our verdict on PropEr

PropEr is an open-source property-based testing tool for developers writing Erlang programs. Rather than checking only hand-picked examples, teams define properties and input types, then generate inputs to check whether those properties hold. Its strongest fit is Erlang teams testing stateful systems: it can model state-machine behavior and exercise it with generated sequences of symbolic API calls. It can also test functions from Erlang specifications, making it relevant to teams that want property checks within an Erlang codebase rather than a separate testing platform.

The feature set goes beyond basic random input generation. PropEr can use its own types and Erlang native types to generate values, and it can derive generators from abstract data type API functions. For stateful testing, teams provide an abstract state-machine model and PropEr generates command sequences to compare behavior against that model. When a property fails, the tool attempts to shrink the failing test to a smaller counterexample, which can make the problematic case easier to inspect. Targeted property-based testing is also included. EUnit and Common Test integrations support using PropEr within those Erlang test workflows.

PropEr is open-source software with a free plan and self-hosted deployment; the published product details describe no paid tier. Support is community-based, so teams should be comfortable working with that support model. Its scope is deliberately tied to Erlang, which makes it a poor fit for organizations seeking one property-testing product across different programming languages. Erlang teams that need generated input, state-machine testing, and failure shrinking should consider it; teams looking for hosted deployment, commercial support, or a broader-language tool should look elsewhere.

Your product? Our editors can test PropEr in depth and publish a review, labelled as paid · from $149/mo →

PropEr pricing

PropEr fact sheet

PropEr integrations

PropEr lists 2 integrations on its own site.

• EUnit
• Common Test

Alternatives to PropEr

• fast-checkA deep, runner-agnostic testing library for JavaScript and TypeScript teams.9.4
• HypothesisA focused Python library for generated inputs, shrinking, and stateful tests.9.3
• ProptestA focused Rust framework for generated inputs, shrinking, replay, and stateful tests.9.1

See all PropEr alternatives →

PropEr vs the competition

• PPropEr vs fast-check
• PPropEr vs Hypothesis
• PPropEr vs Proptest
• PRPropEr vs RapidCheck
• PCPropEr vs CsCheck
• PPropEr vs Scala Hedgehog

Compare PropEr with any tool side by side →

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The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used PropEr for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.

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Featured on iTechGuides

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update