Eigen: Six Months Later vs Pure Effect: Business logic as plain data

A detailed side-by-side comparison of Eigen: Six Months Later and Pure Effect: Business logic as plain data. See how they stack up in pricing, features, and user ratings.

FeatureEigen: Six Months LaterPure Effect: Business logic as plain data
CategoryProductivityProductivity
PricingFreemiumFreemium
DescriptionSix months ago I wrote about Eigen: a European Google Workspace alternative where you own your data. Back then I had five basic apps, built in two months of spare time. Mail, drive, docs, contacts and Trello-like kanban boards. Minimal, but functional.Pure Effect is a zero-dependency effect library for JavaScript and TypeScript. Your business logic returns plain objects describing the I/O it would perform, instead of performing it. You can read those objects in a test or replay them from a failed production run, and the database is never touched until the interpreter runs them.
Tags
EigenMonthsLater
BusinessPureEffectLogic
Websitereindernijhoff.netpure-effect.org
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AddedApr 16, 2026Jun 22, 2026
Eigen: Six Months Later
Eigen: Six Months Later
Pure Effect: Business logic as plain data
Pure Effect: Business logic as plain data

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