Ruby gem turned into SaaS product to speed up tests in an optimal way
Split Ruby, JavaScript tests on parallel CI nodes to save time. Supported Ruby: RSpec, Minitest, Test::Unit, Cucumber, Spinach, Turnip. JavaScript: Cypress.io, Jest, Vitest, Playwright
Ruby gem turned into SaaS product to speed up tests in an optimal way launched on May 3, 2017 with 7 votes, #1,225 of 3,229 launches that month and more than 50% of that year's launches. The site was still online in September 2026, 9 years on.
What it does
The first 14 days are on us. Then pricing starts at $10/committer/month. Knapsack Pro creates a queue of test files sorted by execution times that is consumed in batches by each parallel CI node. The split is balanced regardless of varying runtimes, CI nodes boot time, failing or flaky tests. In case of network issues, Knapsack Pro automatically switches to Fallback Mode and splits your tests based on file names. In the unlikely scenario where some nodes switch to Fallback Mode, but others don't, some tests might be run on multiple CI nodes. Knapsack Pro parallelizes tests across CI nodes by example . This is useful when you have slow test files but don't want to manually split test…from knapsackpro.com
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