logana is a fast terminal log viewer and analyzer designed to work efficiently with very large log files, including multi-GB logs and files containing millions of lines. It uses memory-mapped I/O and SIMD-accelerated line indexing to keep navigation responsive, automatically detects multiple log formats, and supports both interactive analysis in a terminal user interface and headless filtering for scripts or pipelines.
This is free and open source software.
Key Features
- Automatically detects log formats including JSON, syslog, journalctl, logfmt, OpenTelemetry, Apache and nginx access logs, and other common log formats.
- Provides fast filtering with include and exclude patterns, regular expressions, field-scoped filters, and date range filters.
- Supports persistent sessions that restore filters, scroll position, marks, annotations, and other per-file context between runs.
- Displays structured log fields such as timestamps, levels, targets, and extra fields in configurable columns.
- Offers Vim-style navigation, search, warning and error jumps, bookmarks, and inline annotations for investigating logs.
- Can export analysis reports to Markdown or Jira markup.
- Supports multi-tab workflows for opening multiple files or Docker streams side by side.
- Includes a headless mode for running the full filter pipeline without launching the terminal interface.
- Provides configurable keybindings, UI options, and bundled themes.
Website: github.com/pauloremoli/logana
Support:
Developer: Paulo Remoli
License: GNU General Public License v3.0
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