Pharo review

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Pharo brings a Smalltalk-inspired, pure object-oriented language and its IDE together in an immersive desktop environment. It is aimed at developers who want to browse and change code while examining a running program, rather than relying on a conventional edit, compile, and deploy cycle. Its reflective approach also suits teams that work directly with objects, program structures, and call stacks. The project is open source under the MIT license, with development coordinated by the Pharo Consortium and an international developer community.

The distinctive capability is live development. Developers can browse classes, methods, comments, and other program entities, inspect or visualize objects and runtime state, then use an interactive debugger to step through execution and modify code. Reflective object and call-stack inspection and manipulation add depth for investigating behavior in context. Integrated coverage testing supports checking code, while platform-independent image files can save and restore program state. These tools make Pharo a strong fit for Smalltalk workflows centered on exploration and feedback during execution.

Pharo is free and available for Windows, macOS, and Linux. Integrated Git includes method-level merges and history browsing, connecting version control to the environment's code model. However, the environment is specifically oriented around Smalltalk; developers seeking a general-purpose IDE or project-management features should look elsewhere. Build tooling and broader integrations are not established as part of its offering, so teams that depend on a particular build pipeline or ecosystem should assess that fit before choosing Pharo. It suits individuals and teams committed to live, reflective Smalltalk development, but is less appropriate when broad language coverage or project coordination is central.

Pharo pros and cons

• Where it wins
  • Inspect and modify objects and code while programs run.
  • Interactive debugger supports stepping and live code changes.
  • Git history, method-level merges, and coverage testing are integrated.
• Where it doesn't
  • Focused on Smalltalk rather than general-purpose language workflows.
  • Project management is not included.
  • Build tooling and broader integrations are not established here.

Pharo fact sheet, pricing and score →

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Last updated 7 Oct 2026 · How we research and update