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Fray Alternatives
Similar projects and alternatives to fray
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Apache Cassandra
Open source transactional distributed database. Linear scalability and proven fault-tolerance on commodity hardware or cloud infrastructure without compromising performance.
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codetracer
CodeTracer is a user-friendly time-traveling debugger designed to support a wide range of programming languages.
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NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a better fray alternative or higher similarity.
fray discussion
fray reviews and mentions
Posts with mentions or reviews of fray.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2025-06-07.
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Wednesday Links - Edition 2025-11-05
Fray: General-Purpose Concurrency Testing (1 min)🧵 https://github.com/cmu-pasta/fray
- Fray: A Controlled Concurrency Testing Framework for the JVM
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The current state of TLA⁺ development
My current thinking on model checking (still evolving):
Modeling languages are useful to check the correctness of an algorithm during development. During development, a model can also serve as a specification for the actual implementation. This requires that your the modeling language is readable to a broad range of developers, which TLA+ is not. We have been experimenting with FizzBee (fizzbee.io) which looks promising in this regards.
When you go to prod, you really want to test your actual implementation, not a model of it. For this you want something like https://github.com/awslabs/shuttle (for Rust), or https://github.com/cmu-pasta/fray (for Java). Or use something custom.
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Show HN: CodeTracer – a new time-traveling debugger implemented in Nim and Rust
https://github.com/cmu-pasta/fray
Fray is a controlled concurrency testing tool for the JVM that supports record and replay. It could be a perfect backend for codetracer. (I'm the author of Fray)
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Concurrency bugs in Lucene: How to fix optimistic concurrency failures
Using Fray does not require knowledge about "deterministic testing" or "controlled concurrency." This is one of its goals: developers write normal concurrency tests, and Fray controls the execution behind the scenes.
In fact, when we evaluate Fray, we collect all existing concurrency tests from Lucene, Kafka, and Guava, and running them under different thread inter-leavings can already reveal so many bugs. [1]
[1]: https://github.com/cmu-pasta/fray/blob/main/docs/bugs.md
- Show HN: Fray: A controlled concurrency testing framework for the JVM
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A note from our sponsor - SaaSHub
www.saashub.com | 13 Jun 2026
Stats
Basic fray repo stats
7
472
9.2
4 days ago
cmu-pasta/fray is an open source project licensed under Apache License 2.0 which is an OSI approved license.
The primary programming language of fray is Kotlin.
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