Course platform · Beta

Courses worth the time they ask for.

KOSMOSIGN is a platform for long-form, author-written courses — the kind you read and practise rather than watch. Built from text, exercises and time, with the depth of a good popular-science book and none of the filler.

Open KOSMOSIGNSee the courses

Courses

The catalogue

One course is live today, with more in the works. Each one is written end to end before it ships — no half-finished tracks.

LiveReasoning & rationality

Logic as the Foundation of Thinking

Логика как фундамент мышления

A long-form course on how to reason well — from classical logic and the scientific method to probability, causal inference and the limits of rationality. It's built from text, exercises and time: no video lectures, no gamified scores, no filler. The full course is available in both English and Russian.

17 modules across 5 parts

1. Classical logic5 mod.
2. Scientific method & systems thinking4 mod.
3. Probability & uncertainty4 mod.
4. The limits of rationality3 mod.
5. Metalogic1 mod.
TextInteractive exercisesTwo depth levelsProgress trackingEnglish · Russian
Open the course

More courses are in development — applied topics beyond logic. They'll appear here as they're ready.

Approach

How KOSMOSIGN teaches

Built to be read, not watched

Each course is text, exercises and time — written with the depth of a good popular-science book, not chopped into video clips. You read, you think, you practise.

Two depths, your call

Every module has a core track and a deeper one. Take the essentials, or go down into the formalism and history — as far as you actually want to.

Practice, then a checklist

Interactive exercises — quizzes, matching, open questions, case analysis — plus a checklist that turns each module into something you can use in real life.

No dark patterns

No video upsells, no certificates to buy, no leaderboards, no ads. Your progress is tracked for you — it just isn't turned into a points game.

FAQ

Questions, answered

What is KOSMOSIGN?+

A platform for long-form, author-written courses you read and practise rather than watch. The first course is Logic as the Foundation of Thinking.

Is it free?+

Yes. KOSMOSIGN is in beta with payments switched off, so all course material is free right now.

What courses are available?+

One so far — Logic as the Foundation of Thinking, a 17-module course on reasoning and rationality. More courses are in development.

Is there video?+

No. Courses are built from text and interactive exercises — designed to be read and worked through, not watched.

Do I need an account?+

Yes — you sign in with Google so your progress is saved across modules. KOSMOSIGN is in early beta, so access is currently by invitation; you can request it from the platform.

Are there certificates, scores or leaderboards?+

No certificates and no leaderboards. Your progress is tracked (module status and exercise results), but it is deliberately not a gamified points system.

What language are the courses in?+

The Logic course is fully available in both English and Russian — every module, exercise and example is translated. New courses start in Russian and may add English over time.

Start with how you think.

The Logic course is free during the beta. Open KOSMOSIGN and work through it at your own pace.

Open KOSMOSIGN