tldx helps you brainstorm available domain names fast.

Features:
- Smart keyword-based domain permutations (prefixes, suffixes, TLDs)
- Fast and concurrent availability checks with RDAP
- Streams results as they're found
- Supports multiple output formats (text, json, json-stream, json-array, csv)
- Supports TLD presets to quickly select groups of common or curated TLD sets
- Optional filtering by domain length
- Great for technical founders, indie hackers, and naming brainstorms
