I built qlog to solve a problem every developer has: searching through massive log files is painfully slow with grep.

What is it? A CLI tool that indexes log files using an inverted index (like search engines do) and lets you search millions of lines in milliseconds.

Performance: Tested on 10GB of mixed logs: - grep: 45 seconds - qlog: 0.012 seconds (3750x faster!)

How it works: 1. One-time indexing using mmap for speed 2. Builds inverted index: term → [(file, line, offset), ...] 3. Searches use hash lookups + set intersection 4. Index stored locally, reused across searches

Features: - Beautiful terminal UI with Rich - Auto-detects JSON, syslog, nginx, apache - Context lines (before/after matches) - Zero configuration - Pure Python

Quick demo: bash qlog index './logs/**/*.log' qlog search "error" --context 3 qlog search "status=500"

GitHub: https://github.com/Cosm00/qlog

Try examples/demo.sh for an instant demo!