Ruby Generator
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Model:
+ GPT-5, Claude, Gemini
Describe a controller or feature and get modern Ruby 3.3 - pattern matching, endless method definitions, Data.define value objects, Hash#except patterns. 8 style presets including Rails 7.1, Sinatra, Hanami 2, and dry-rb. Gemfile snippet when gems are added.
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Generate Ruby code with free AI. Rails apps and scripts.
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Use this tool via API
Automate this tool from your own code. OpenAI-compatible REST endpoint, Bearer-token auth, no extra SDK required. Token costs match the web interface.
curl -X POST https://api.free.ai/v1/chat/ \
-H "Authorization: Bearer sk-free-..." \
-H "Content-Type: application/json" \
-d '{"model": "qwen-coder", "messages": [{"role": "user", "content": "Write a Python function that reverses a string."}]}'Ruby Generator — FAQ
Modern Ruby 3.3 - pattern matching, endless method definitions, Data.define for value objects, Ractor where applicable, Hash#except / with_indifferent_access patterns. 8 style presets (Rails 7.1 / Sinatra micro / Hanami 2 / Ruby on Rails API / Ruby gem / dry-rb functional / RSpec tests / Bundler script). Gemfile snippet emitted when gems are pulled in.
Yes - a typical Rails controller + model + tests costs ~1,500 tokens on Qwen 3 Coder, inside the 2,500 anonymous / 10,000 signed-up daily pool. Premium Claude Sonnet / GPT-5 available per-call for complex multi-class refactors and Rails-edge patterns.
JetBrains AI ($10/mo) is built into RubyMine. GitHub Copilot ($10-39/mo) works in RubyMine and VS Code. Cursor ($20/mo) handles Ruby well in VS Code. Tabnine ($12/mo Dev) and Codeium (free + $15/mo Pro) round out the autocomplete space. Our tool is web-based one-shot - describe a feature, get a complete file.
Pick the Rails 7.1 preset. Output uses Hotwire (Turbo + Stimulus) over JavaScript SPAs, ActiveRecord with proper scopes + concerns, strong parameters, ActionController::API where appropriate, Active Job with Solid Queue (Rails 8 default) or Sidekiq. Migrations include reversible up/down where the change is non-trivial.
Yes - small classes (under 100 lines preferred), few methods (5-ish public, others private), short methods (under 10 lines). Service objects for non-trivial business logic, plain old Ruby classes (POROs) over ActiveRecord callbacks where the logic is not persistence-tied.
Pick the matching preset. Sinatra output is a single-file or modular app - explicit get / routes, settings via set, ERB or Tilt for templates. Hanami 2 output uses the actions / views / persistence split, dry-rb foundation, ROM.rb for persistence, dependency injection via the container.
Pick the Ruby gem preset. Output is the structure Bundler creates: lib/foo.rb with module definition, lib/foo/version.rb, foo.gemspec with proper metadata + dependencies, README outline, RSpec or Minitest test setup. CI workflow snippet (GitHub Actions) included.
Pick the dry-rb functional preset. Output uses Dry::Struct for typed value objects, Dry::Validation for input contracts, Dry::Monads (Result, Maybe) for typed flow control, Dry::Effects for dependency injection. Functional style - pure functions where possible, side effects pushed to the boundary.
Yes - pattern matching (case ... in), endless methods (def foo = bar), Data.define for value objects (Ruby 3.2+), Hash#except / #slice, kwargs (no positional hash params), keyword pattern. Avoids deprecated patterns (Rails 4-style mass-assignment, OpenStruct in hot paths).
Pick the RSpec tests preset. Output uses describe / context / it nesting, let blocks for memoized helpers, factory_bot for fixtures, shoulda-matchers where they read better than custom expectations, time-travel via ActiveSupport::Testing::TimeHelpers. For Minitest output mention it in your description.
Review every output for SQL injection in raw SQL fragments (the model uses ActiveRecord scopes but always double-check), mass-assignment (strong params), CSRF (Rails handles it but custom routes might bypass). Run /code/review/ with security focus, /code/refactor/ for general code-quality.
Yes - POST to /v1/chat/ with the same system prompt this page builds. Useful for Rails generators, Bundler plugins, or scaffolding CLIs. Bearer auth, rate-limited. Docs at /api/.
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