SpellKit brings blazing-fast spell checking and typo correction to Ruby through native Rust bindings. Built on the SymSpell algorithm, it corrects user input at 16,000+ operations/second while preserving technical terms, product codes, and domain-specific terminology.

What makes it special:

• Zero runtime dependencies (pure Ruby + Rust, no external services)
• Protection for technical terms (gene names, SKUs, CAS numbers)
• Hot-reload dictionaries without restarting your application
• Thread-safe concurrent reads with efficient locking
• Aspell-inspired skip patterns (URLs, emails, camelCase, version numbers)
• Preserves canonical forms (NASA stays NASA, iPhone stays iPhone)

Key features:

• 16k ops/sec throughput with 80k word dictionary (p50: 61µs, p95: 66µs)
• Configurable edit distance (1 or 2) and frequency thresholds
• Batch optimization for processing multiple tokens efficiently
• Supports both TSV and space-separated dictionary formats
• Multiple independent instances for different domains (medical, legal, etc.)
• Comprehensive statistics and healthcheck APIs for monitoring

Perfect for search interfaces, data extraction pipelines, form validation, and any application that needs to handle real-world messy input while respecting domain terminology - all within your Ruby process.

Links:

• GitHub Repository & Documentation
• RubyGems

Part of the scientist-labs ecosystem bringing production-ready text processing tools to Ruby.