Who should use CoJitsu?

CoJitsu is a consumer product built for competitive programmers and coding students.

Does CoJitsu have a free plan?

Yes — CoJitsu is free to use.

What platforms does CoJitsu run on?

CoJitsu runs on the web and embeddable surfaces.

Is CoJitsu still active?

Unverified. CoJitsu has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What projects are similar to CoJitsu?

Similar projects tracked by PulseGate include Morse Code Translator & Learn, Track My Course, and Mathematics Dictionary Offline.

Who develops CoJitsu?

CoJitsu is developed by Anjney Lawaniya.

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CoJitsu

Name: CoJitsu
Author: Anjney Lawaniya

mozilla.orgFlashcards & study tools

CoJitsu is a Firefox extension that aggregates daily coding problems from Codeforces, LeetCode, and AtCoder. It normalizes difficulty, tracks practice streaks and history, and provides extra problems by topic and rating for competitive programmers.

FreeWebEmbeddable

Visit mozilla.org

Overview

8 features

CoJitsu is a Flashcards & study tools project. It focuses on practicing competitive programming consistently across Codeforces, LeetCode, and AtCoder without manually finding and tracking problems. It is built as a consumer product for competitive programmers and coding students. CoJitsu costs nothing to use. CoJitsu is available on the web and embeddable surfaces.

Anjney Lawaniya builds and maintains CoJitsu, and it first shipped in 2026. Among its 8 catalogued features are daily problems, multi-platform aggregation, and difficulty scaling. The interface is available in 32 languages, including Czech, German, and Greek. It exposes integrations via a public API.

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

Daily problems
Multi-platform aggregation
Difficulty scaling
Streak tracking
Calendar history
Extra practice
Topic filtering
Rating filters

Built with & integrations

Connectors

API

Runs on

BrowserEmbeddable

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceFree tierMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed12 Sept · 01:50 UTC
CoJitsu verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about CoJitsu

What does CoJitsu do?: CoJitsu focuses on practicing competitive programming consistently across Codeforces, LeetCode, and AtCoder without manually finding and tracking problems. It is catalogued under Flashcards & study tools on PulseGate.
Who should use CoJitsu?: CoJitsu is a consumer product built for competitive programmers and coding students.
Does CoJitsu have a free plan?: Yes — CoJitsu is free to use.
What platforms does CoJitsu run on?: CoJitsu runs on the web and embeddable surfaces.
Is CoJitsu still active?: Unverified. CoJitsu has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What projects are similar to CoJitsu?: Similar projects tracked by PulseGate include Morse Code Translator & Learn, Track My Course, and Mathematics Dictionary Offline.Morse Code Translator & Learn Track My Course Mathematics Dictionary Offline
Who develops CoJitsu?: CoJitsu is developed by Anjney Lawaniya.
When did CoJitsu launch?: CoJitsu first shipped in 2026.

At a glance

Pricing: Free
Platforms: Web
First seen: 12 Sept 2026
Built for: competitive programmers and coding students
Model: B2C
Solves: Practicing competitive programming consistently across Codeforces, LeetCode, and AtCoder without manually finding and tracking problems.

Registered as

Firefox Add-ons: cojitsu

Developer

Anjney Lawaniya

Index record

Indexed: 12 Sept 2026
Lifecycle: Alive
First seen: Sept 2026
Last seen: 12 Sept 2026

Identity audit (13)

Slug: cojitsu-mozilla-org
Lifecycle state recorded: 12 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 12 Sept 2026
Timeline basis: Indexed-at chronology (no inferred launch/funding milestones).
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: 12 Sept 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/cojitsu

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