Cuis SmalltalkThe modern Smalltalk-80
Cuis is a free Smalltalk-80 environment with a specific set of goals: being simple and powerful.
It is also portable to any platform, fast and efficient.
“I like it… It’s nice and clean and simple and pretty. Nice stuff!”
“Yay, Juan. You GO, guy! …a great example of malleable software (and a clever mind) at work.”
“I think you have a very elegant design aesthetic.”
Latest news
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Cuis at Smalltalks 2026
Smalltalks 2026 takes place from October 14 to 16 at the Facultad Regional Rosario of the UTN, in Rosario, Argentina, and Cuis will be there: eight talks of the program come from the Cuis community or show work done in Cuis. We hope to see you all there!
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July Cuis Meeting
What. It is a “Demo Meeting” for demonstration then discussion. Milan Lajtos will present his experience on using a code agent to develop Blueprint, a revisit of the Cuis Smalltalk system desktop.
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Cuis 7.8 release
Cuis 7.8 stable release!
Latest meeting
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Claude Code and MCP Server
Hernán Wilkinson shows how Claude Code works on a live Cuis image through his MCP server. Claude builds a calculator with a Morphic UI and its tests, makes a second window for it with GUI Designer by driving the designer's model, reproduces from a screenshot the form layout example Ken Dickey shows at the start, and fixes the extra parentheses left by the Extract Temporary refactoring.