Kairos
Kairos decides every sign-up, login, order, payment and payout as it happens, and keeps each decision with the signals behind it.
Kairos launched on 3 November 2026. It ranked #21 on Daily Launch on 4 November 2026 with a Launch Score of 64, from 85 points on Show HN. It was new in the ranking that day.
What is Kairos?
Kairos decides every sign-up, login, order, payment and payout as it happens, and keeps each decision with the signals behind it. It is an open-source alternative to Sardine, Sift, Riskified and SEON, with two things they don't have: your coding agent tunes it, and decision models catch fraud before you have the labels to train on.
From its README on GitHub
Kairos is a launch on Show HN. It is written in TypeScript and released under the Apache-2.0 license.
In its own words
Open-source risk and fraud decisioning platform
From its Show HN post
Launch timeline
Launch Score, last 7 days
Ranked on one day so far: 64 of 100 on 4 November.