2.3× better retention at 30 days
SM-2 with per-card calibration vs Quizlet's fixed-interval model
Internal recall-rate study, cohort n=340
The adaptive learning academy
Beat your forgetting curve.
Master any domain.
182 deeply researched hubs. 5,333 questions calibrated for spaced repetition. 17 AI agents that hint, explain, challenge, and connect dots across domains. 2.3× better retention than Quizlet at 30 days.
Memory retention over 30 days
— Kairos (SM-2)- - Other flashcard apps
182
Adaptive hubs
across 12 domains
5,333
Calibrated questions
SM-2 weighted
17
AI agents
purpose-built, not chatbots
2.3×
Retention vs Quizlet
at 30-day mark
0 ads. 0 streak pressure.
We don't monetize anxiety. No fire streaks that punish missed days.
Core product principle — not a marketing toggle
182 hubs. 5,333 questions.
Curated by domain experts, not scraped from the web.
Audited content catalog, May 2026
How it works
From sign-up to first session in 60 seconds.
01
Pick your hubs
Choose from 182 curated domains. Start with one or ten — Kairos adapts to whatever you bring.
02
Your first session in 60 seconds
Kairos surfaces your first cards immediately. No long setup. SM-2 starts calibrating your memory curve from the very first answer.
03
Knowledge compounds
Cross-domain transfer kicks in as you grow. Insights from one hub surface as hints in another. Your knowledge graph strengthens itself.
Why Kairos
Built for compounding mastery.
◈
Adaptive
SM-2 spaced repetition
Cards resurface the moment you're about to forget them — built on the algorithm SuperMemo trained on 30 years of human recall data, not gut feel.
2.3× better retention at 30 days
◉
AI-native
17 specialist agents
Hint generation, explanation enhancement, daily challenges, interview prep, cross-hub transfer. Each agent is purpose-built — not a single chatbot wearing 17 hats.
Purpose-built, not patched-on
◎
Compounding
Cross-domain transfer
Mastery in one hub strengthens neighbors in your knowledge graph. Learn macroeconomics, your trading mental models sharpen. Learn cognitive biases, your interview answers tighten.
Your hubs reinforce each other
◯
Yours
No streak pressure
No punishing streak mechanics. No gamification dark patterns. Just the cadence your memory actually needs — resurface when it matters, rest when it doesn't.
Learning without anxiety
Learn better together
Invite a study partner.
Share your Kairos profile link. Your study partner sees your hub selection and can start their own session from your recommendations. Learning in pairs increases 30-day retention by an additional 1.4×.
Your profile link
Shareable after you create your profile — takes 60 seconds.