LogiCola 3 is an instructional program that goes with Gensler's Introduction to Logic (Routledge Press). Since Harry Gensler, the original creator has passed away, I decided to create a new version to preserve an important learning resource and honour his legacy.

Logicola is a web-based remake of the original Logicola software, designed to help students learn logic more easily across modern devices while preserving the spirit of the original program.

The live project is available at logicola.org.

About

This project focuses on making logic instruction more accessible to students,teachers, and universities by combining:

• Interactive quizzes.
• Installable web app support for offline quiz use.

Logicola is still growing. The current codebase reflects both ongoing content development and the practical goal of keeping the platform widely accessible on the web.

Getting Started

Install dependencies with pnpm:

pnpm install

Run the development server:

pnpm dev

Open http://localhost:3000 with your browser to see the result.

You can start editing the app by modifying files in app/, components/, and content/.

Copy .env.example to .env.local for analytics and the newsletter. Both are optional: without them the site runs, it just doesn't report or subscribe.

Verification

Run the core verification checks:

pnpm build
pnpm test

pnpm build produces a static export in out/ and writes the offline cache manifest used by the service worker into it. To run that build the way production serves it (on the Cloudflare Workers runtime, with the site's redirects, headers and 404 page), use:

pnpm start

The newsletter endpoint only exists in that mode: under pnpm dev the signup form shows its error state.

Deployment

logicola.org is a static export served by Cloudflare Workers. Pushes to main deploy through Workers Builds; other branches get a preview URL. The only server code is worker/index.ts, which handles newsletter signups. The site moved from Vercel on 2026-09-24.

How deploys work, the rules a static export imposes, configuration, rollback, and retiring the old Vercel project are in docs/deployment.md.

Offline Support

Logicola supports offline access for published quizzes after the app has been installed or loaded while online.

Technical details and maintenance notes are documented in docs/offline-support.md.

Project Notes

• Quiz route publishing is tracked in content/quiz-catalog.json.
• The offline service worker is intentionally scoped to published quizzes and the app shell they need.
• For maintenance and release verification, see docs/release-checks.md.
• For deploys, configuration and rollback, see docs/deployment.md.

This project uses next/font to load Roboto Flex.

License

LogiCola 3 is free and open source software under the GNU Affero General Public License v3.0 or later (changed from MIT on 2026-08-24 — see NOTICE for the history and the preserved MIT attribution).

Use it, study it, share it, fork it. The one obligation that matters: if you run a modified version as a network service, AGPL section 13 requires you to offer your users its complete source. Someone can charge for a fork — but they cannot keep it closed, which is the point.

Versions published while the project was MIT-licensed remain MIT for those versions. Rights in the Gensler drill material are separate from the software licence.