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Allegro CL

Freemium#33 of 65 in Integrated Development Environments

Allegro CL: A Lisp-focused IDE that also brings debugging, data, web, and deployment tools together. Ranked #33 of 65 in Integrated Development Environments by our editors (6.0/10); pricing: Free plan; best for lisp teams needing an IDE and application infrastructure.

6.0/10Editor score

Visit Franz Inc.

Allegro CL6.0 Visit Franz Inc.

At a glance

Editor score
6.0 / 10
Pricing
Free plan
Best for
Lisp teams needing an IDE and application infrastructure
Free plan
Yes
Founded
1984 · Lafayette, California, USA
Facts checked
22 Sep 2026

Where it wins
- Combines Lisp listeners, editing, inspection, debugging, and profiling.
- Project tools cover testing applications and generating standalone executables.
- Includes database, web, and AllegroGraph LLM-related capabilities.
Where it doesn't
- Focused on Common Lisp rather than a broad range of languages.
- The free Express edition has limitations compared with commercial versions.
- Commercial licensing and pricing require contacting Franz Inc.

Our verdict on Allegro CL

Allegro CL is Franz Inc.'s Common Lisp development environment for teams building and deploying Lisp applications. Its desktop IDE combines listeners, code editing, object inspection, project management, testing, debugging, profiling, and executable generation. Available for Windows, macOS, and Linux, it is positioned for mid-market and enterprise work, including symbolic AI, data integration, and applications using AllegroGraph or AllegroCache. Its strengths are most relevant to teams committed to Common Lisp; developers seeking a general-purpose, multi-language IDE should look elsewhere.

The toolset extends beyond editing and debugging into application infrastructure. AllegroCache provides persistent object storage with transactions and client-server operation, while connectivity features include XML parsers, SSL socket streams, and RPC. AllegroServe and the Webactions framework address web applications. AllegroGraph adds knowledge graph and vector storage capabilities, as well as LLM integration. The listed ecosystem also includes Oracle, MySQL, ODBC, GNU Emacs, and SLIME. This breadth may suit teams that want Lisp development and supporting application components in one environment, though it is a more specialized fit than an IDE centered on broad language coverage.

Allegro CL has a free plan, and the free Express edition has limitations compared with commercial versions. According to Franz Inc., prospective customers should contact the company for commercial licensing and pricing, so teams evaluating paid use will need to engage with the vendor. Support channels include email and documentation. Choose Allegro CL when Common Lisp is central to the work and its integrated project, database, web, and deployment tools match the stack. It is less suitable for teams prioritizing a broad language ecosystem or transparent published commercial pricing.

Your product? Our editors can test Allegro CL in depth and publish a review, labelled as paid · from $149/mo →

Allegro CL pricing

Plans Free planFreemium A usable free plan; paid tiers unlock the limits above. Prices checked 22 Sep 2026.

See plans on franz.com

Allegro CL fact sheet

Free plan	Yes
Paid from	Not verified
Supported operating systems	Not verified
Integrated debugger	Yes
Integrated testing tools	Yes
Build tools	Yes
Project management	Yes
Dev container support	Not verified
Deployment	Desktop
Platforms	Windows, macOS, Linux
Support	Email, Docs
Built for	Mid-market, Enterprise (editorial estimate)
Integrations	7 integrations: AllegroGraph, AllegroCache, Oracle, MySQL, ODBC, GNU Emacs …
Pricing	Free plan (source)
Website	franz.com
Facts checked	22 Sep 2026

Allegro CL integrations

Allegro CL lists 7 integrations on its own site.

AllegroGraph
AllegroCache
Oracle
MySQL
ODBC
GNU Emacs
SLIME

Alternatives to Allegro CL

See all Allegro CL alternatives →

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Featured on iTechGuides

Allegro CL is listed in our Integrated Development Environments directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update