What is Basilisk Playground?

Quickly checking Python type errors without installing tools or sending code to a remote server. It is catalogued under Developer Tools on PulseGate.

Who should use Basilisk Playground?

Basilisk Playground is an open-source project built for python developers.

Does Basilisk Playground have a free plan?

Yes — Basilisk Playground is open source under the MIT license and free to use.

What platforms does Basilisk Playground run on?

Basilisk Playground runs on the web.

Is Basilisk Playground still active?

The GitHub repository shows 119 commits in the last 90 days.

What are alternatives to Basilisk Playground?

Similar projects tracked by PulseGate include EfficiencyNext Data Connector, System Information Widgets, and CKB.

Who develops Basilisk Playground?

Basilisk Playground is developed by Nimblesite Pty Ltd.

How long has Basilisk Playground been around?

Basilisk Playground first shipped in 2026.

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Basilisk Playground

Name: Basilisk Playground
Author: Nimblesite Pty Ltd

basilisk-python.devInfrastructure

Basilisk is a full Python type checker based on Ruff that runs locally in the browser via WebAssembly. It provides real-time diagnostics using the latest typing specification, includes an embedded typeshed, and never sends user code to any server. The playground offers an interactive Monaco editor for immediate testing of type rules and mismatches. It is built by the creators of several other open-source developer tools and is freely available under the MIT license.

Open SourceMITWeb

Visit basilisk-python.dev

51stars

2forks

5features

2026since

Overview

5 features

Basilisk Playground is a Developer Tools project. Quickly checking Python type errors without installing tools or sending code to a remote server. Basilisk Playground is an open-source project aimed at python developers. The project is open source (MIT). It ships for the web.

Behind Basilisk Playground is Nimblesite Pty Ltd, and it first shipped in 2026. The project is developed in the open on GitHub with 51 stars and 119 commits in the last 90 days. Key capabilities include webAssembly execution, real-time type checking, and typeshed support.

Summary written by a language model from the project’s public pages.

WebAssembly execution
Real-time type checking
Typeshed support
Monaco editor integration
No server upload

Built with & integrations

Runs on

Browser

Trust & compliance

License

MIT

Verified signals

HTTPSOpen SourceFree tierActive maintenance

Indexing history

What PulseGate has recorded for this listing

Indexed31 Jul · 07:45 UTC
Type Check Your Python in the Browser verified against its public source
Source: PulseGate · Open

Frequently asked questions about Basilisk Playground

What is Basilisk Playground?: Quickly checking Python type errors without installing tools or sending code to a remote server. It is catalogued under Developer Tools on PulseGate.
Who should use Basilisk Playground?: Basilisk Playground is an open-source project built for python developers.
Does Basilisk Playground have a free plan?: Yes — Basilisk Playground is open source under the MIT license and free to use.
What platforms does Basilisk Playground run on?: Basilisk Playground runs on the web.
Is Basilisk Playground still active?: The GitHub repository shows 119 commits in the last 90 days.
What are alternatives to Basilisk Playground?: Similar projects tracked by PulseGate include EfficiencyNext Data Connector, System Information Widgets, and CKB.EfficiencyNext Data Connector System Information Widgets CKB
Who develops Basilisk Playground?: Basilisk Playground is developed by Nimblesite Pty Ltd.
How long has Basilisk Playground been around?: Basilisk Playground first shipped in 2026.

At a glance

Pricing: Open Source
Platforms: Web
Languages: English
License: MIT
Built for: Python developers
Model: Open source
Solves: Quickly checking Python type errors without installing tools or sending code to a remote server.

Developer

Nimblesite Pty Ltd

Small team

Open source

Stars: 51
Forks: 2
Open issues: 66
Last commit: 30 Jul 2026
Commits 90d: 119
Contributors: 3
Authorship: Small team
Default branch: main
Latest release: v0.38.0 · 29 Jul 2026

Live coverage

Identity confidence: High · 87.8
Indexed: 31 Jul 2026
Lifecycle: Alive
Last seen: 31 Jul 2026

Identity audit (13)

Slug: type-check-your-python-in-the-browser-basilisk-python-dev
Lifecycle state recorded: 31 Jul 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 31 Jul 2026
Timeline basis: Indexed-at chronology. This listing's first-seen date was written by the catalog backfill, not observed here, so it is not treated as a sighting.
Name from: Derived from the project's own page and URL.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 31 Jul 2026
Canonical URL: https://basilisk-python.dev/playground

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