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Effect 4.0 · House #32,827

A rebuilt, dependency-free core for the Effect framework

In the Building and consuming APIs neighborhood (Developer). In town since 6 Oct 2026.

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What Tablif read on Effect 4.0's site

Effect 4.0 describes itself as: “Effect 4.0 A rebuilt, dependency-free core for the Effect framework”

What it is

Calls itself “framework”.

  • Calls itself: framework
“Effect 4.0 is a rebuilt version of the Effect framework”

Where it puts itself

Claims “most ambitious release we’ve ever shipped”.

  • Superlative claim: most ambitious release we’ve ever shipped
“It’s the most ambitious release we’ve ever shipped.”

What it costs

Sales on request.

  • Contact sales: yes
“Many previously separate packages now live in effect itself.”
“If your team runs Effect in production, let’s talk .”

Who it sells to

Sells to developers. Built for enterprise and small businesses.

  • Sells to: developers
  • Company size: enterprise · small businesses
“Migrating? Start with the migration guide . Hand it to your coding agent, and it should do most of the work on its own.”
“Effect now runs in production at companies of all sizes, including large enterprises.”

How it runs

Distributed through the npm. Offers an API. Open source.

  • Distributed via: npm
  • API: yes
  • Open source: yes
“Weekly npm downloads effect Downloads in the week of September 21, 2026 43.9M”
“API reference”

What it works with

Names Alchemy and Foldkit on its pages.

  • Names: Alchemy · Foldkit
“Projects with communities of their own have grown around it: Alchemy for cloud infrastructure, and Foldkit for the frontend.”
“Effect 4.0 is a rebuilt version of the Effect framework”

What it offers as proof

Live, no waitlist. Claims “43.9M”. Publishes docs and a blog.

  • Number claimed: 43.9M
“Effect 4.0 is a rebuilt version of the Effect framework”
“Weekly npm downloads effect Downloads in the week of September 21, 2026 43.9M”

Sources

Tablif read these pages, last on 6 Oct 2026. Everything above is what the product says about itself; Tablif does not verify every claim.

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