LogSquirl — Faster Log Explorer

An open source, cross-platform log viewer built with C++23 and Qt6. Blazing fast — optimized for modern multi-core CPUs with SIMD (SSE2 → AVX512). Handles 10 GB+ log files without loading them into memory.

Latest Release

v26.06.0 Stable release — Auto log format detection, chart templates, table view, Filters Panel improvements, security hardening, and more.

All Releases View all release notes and download links.

Screenshots

Features

Core Features

Runs on Windows, macOS, and Linux thanks to Qt6
Displays search results separately from the original file
Perl-compatible regular expressions via Vectorscan SIMD engine
Colorizes log lines with multi-set highlighters
Context view showing where matches are in the log
Reads file directly from disk — no memory loading
Follow Mode — watches for file changes and reloads in real-time
Configurable keyboard shortcuts

New in LogSquirl

Chart Panel — plot numeric values with regex capture groups, timestamps, bucketing, presets, filter frequency, and format-aware quick-add templates
Plugin System — DataSource, Converter, and UI plugins via pure C ABI (or Lua scripts)
Log Merge — combine multiple log files into a unified, live-updated view
Tab Groups — organize tabs with named, colored groups; session persistence
Context Lines (Breadcrumbs) — surrounding lines around matches in filtered view
Predefined Filters Panel — pinned filters with Chipmunk import support
Scratchpad — Base64, Hex, URL, JSON/XML formatter, CRC32, timestamps, JWT decoder
Boolean Search — combine regex with AND, OR, NOT operators

Documentation

LogSquirl Wiki Full documentation including Getting Started, feature guides, configuration reference, and plugin development.

System Requirements

CPU: SSE2 minimum. SSSE3/POPCNT recommended. AVX2/AVX512 auto-detected for best performance.
OS: Windows 10+, macOS 15+, Ubuntu 22.04+, Fedora 43+, Oracle Linux 10+
License: GPL-3.0-or-later