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effect vs twenty

effect and twenty share 7 technologies: React, Redis, ClickHouse, react-error-boundary, jose, Zod, and opentelemetry. Both are written in TypeScript.

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What they share and what sets them apart

Effect-TS

effect

Build production-ready applications in TypeScript

TypeScript17.5kRead on November 6, 2026, at commit 9428e17What is effect built with?

Only in effect

In common

twentyhq

twenty

The open alternative to Salesforce, designed for AI.

TypeScript60.5kRead on November 5, 2026, at commit 8919279What is twenty built with?

Only in twenty

Side by side

SizeLines written by people and agents, without generated ones; code files, without tests.
effect1,052,986 lines written1,112 code files
twenty2,785,537 lines written26,644 code files
Who writes itA commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
effect1.8% of its commits signed by AIWith Claude Code and Cursor
twenty1.9% of its commits signed by AIWith Claude Code, Cursor, GitHub Copilot, and Sweep
ActivityFrom GitHub and its history, on the day SeeRepo read it.
effectLast push November 6, 202612,269 commits17,497 stars
twentyLast push November 5, 202617,869 commits60,472 stars
TestsThe files that test the code, and the share of code files a test imports.
effect885 test files6.3% of its code files have a test that imports them
twenty7,108 test files29% of its code files have a test that imports them

Frequently asked questions

Which is bigger, effect or twenty?
twenty, with 2,785,537 lines written; effect has 1,052,986.

The proof: twentyhq/twenty's code at commit 8919279

Which has more GitHub stars, effect or twenty?
twenty, with 60,472 stars; effect has 17,497.

The proof: twentyhq/twenty on GitHub

Which has more tests, effect or twenty?
twenty, with 7,108 test files; effect has 885.

The proof: twentyhq/twenty's code at commit 8919279

Which was updated more recently, effect or twenty?
effect: its last push was on November 6, 2026, and twenty's on November 5, 2026.

The proof: Effect-TS/effect's commits on GitHub

Which has more commits signed by AI, effect or twenty?
twenty: an AI signed 1.9% of its commits, with Claude Code, Cursor, GitHub Copilot, and Sweep; in effect, 1.8%.

The proof: the commits each tool signed in twentyhq/twenty

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