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Explicit capabilities
Disk, network, environment and process operations require capabilities explicitly passed into Koschei code.
KOSCHEI LANG · v0.10.0 · CAPABILITY SECURITY
Security starts with
explicit authority.
A programming language that makes disk, network, environment and process permissions explicit. Inspect what your code can reach before it runs.
One-time commercial license · One developer · 12 months of updates · Perpetual use of acquired versions
BUILT FOR CONTROL
Know what your software can do.
Language-level protections you can test and inspect, without claiming every threat outside the Koschei toolchain is solved.
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Compile-time rejection
ks check rejects the bundled unauthorized-import example with diagnostic KS2401 before running it.
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Auditable reach
ks caps reports the program's reachable capabilities. ks caps --deny net can fail CI when network authority appears.
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Run and compile
ks run uses the checked interpreter. ks build compiles native applications through the present Go-based adapter.
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Core Library
Typed collections, text helpers and SHA3-256 digest support, with growing libraries authored in Koschei source.
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Practical examples
Includes secretscan, directory-integrity examples, a VS Code extension and bilingual reference guides.
REAL COMMANDS · EXPLANATORY PREVIEW
A denial you can reproduce.
These commands run locally after installing the official package. This website displays commands; it does not execute code in your browser.
ks check examples/supply_chain/main.ks
# Expected: KS2401 · exit 1ks caps --deny net examples/apps/secretscan/main.ks
# Expected: exit 0START IN MINUTES
From ZIP to first program.
Extract the purchased ZIP and open a terminal inside its koschei-lang-0.10.0 directory. On Unix-like systems, use Python 3.12+; native builds also require Go 1.24+.
01
Install
./install.sh ks version
Install the language into your own user environment.
02
Run a program
ks run examples/hello.ks
The bundled hello program prints Koschei and 1.
03
Inspect a security boundary
ks check examples/supply_chain/main.ks
Expect KS2401, a deliberate denial of a module that lacks disk authority.
Inside the product ZIP: English/Turkish guides, the Core Library reference, examples and release notes. Source-repository access is not included.
STRAIGHTFORWARD LICENSING
Build commercially. Pay once.
KOSCHEI LANG · INDIVIDUAL
$49USD
One-time purchase · One named commercial developer
- Perpetual use of acquired versions
- Releases within the following 12 months included
- Compiler, Core Library, docs and included examples
- Programs and generated binaries remain yours
USD pricing; tax shown at checkout. Polar is the payment processor / merchant of record.
FAQ
Before you start.
Does the $49 license expire?
No. You can use acquired versions indefinitely; versions released within 12 months of purchase are included.
Is Go required?
Python 3.12+ is required for installation and the interpreter. Go 1.24+ is required when you use ks build.
Is this a Web3-only language?
No. Koschei Lang is an independent general-purpose language. Web3 and AI integrations are separate applications, not the language's required runtime.
Can I redistribute the compiler?
Not without separate permission. Programs you author and the binaries produced by ks build belong to you, subject to the LICENSE. The Koschei toolchain itself is proprietary.