# Foryx: The For-You feed, from the inside

> A pure feed ranker: affinity × interest × engagement, scaled by an exponential recency decay, then a greedy diversity re-rank with an author-repeat penalty. Flip ranked vs chronological and watch posts rise and sink. 12 tests on the scoring, interleaving, and explanations.

Foryx is a transparent feed ranker that shows exactly how a For-You algorithm decides what surfaces and why. The signature technique combines an affinity, interest, and engagement score scaled by an exponential recency decay, followed by a greedy diversity re-rank with an author-repeat penalty, and you can flip between ranked and chronological to watch posts rise and sink. It is a from-scratch, dependency-light build you can download and run locally.

## About the app

Recommender systems

## What to take away

- A pure feed ranker: affinity × interest × engagement, scaled by an exponential recency decay, then a greedy diversity re-rank with an author-repeat penalty. Flip ranked vs chronological and watch posts rise and sink. 12 tests on the scoring, interleaving, and explanations.
- Download: Foryx (ZIP)

## Tags

Free software, Foryx

## Read the full write-up

/downloads/foryx.zip

## We build this for clients

https://dfieldsolutions.com/en/services/full-stack

## More from the lab

- https://dfieldsolutions.com/en/lab/sylex.md — Sylex: Make sense of the slashes
- https://dfieldsolutions.com/en/lab/kindra.md — Kindra: Miss a beat, not the rhythm
- https://dfieldsolutions.com/en/lab/voxara.md — Voxara: Argue better. Lose gracefully
- https://dfieldsolutions.com/en/lab/wraithward.md — Wraithward: Spot the bait before you bite

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Source: https://dfieldsolutions.com/en/lab/foryx
DField Solutions — Torony köz 5-1.a, 2120 Dunakeszi, Hungary — +36 20 722 0002 — dezso@dfieldsolutions.com
Booking: see https://dfieldsolutions.com/en/contact