A fast desktop log viewer for gigabyte logs. Filter, follow a request, group exceptions, and read thread dumps, GC logs and heap dumps explained in plain words. Ask GitHub Copilot or Claude Code about any of it.
Show, hide or mark lines with filters combined by AND, OR and NOT. The timeline shows error bursts at a glance; select a range to zoom in.
Right-click a trace or request ID: its lines in order, across threads, open logs and whole folders, inside zips too, with the longest wait marked.
Java, .NET and Python stack traces grouped by what went wrong and where in your code. Click a frame to open it in your editor.
Open thread dumps or attach to a running JVM, also over SSH. Deadlocks, lock queues and stuck threads are pointed out; heap dumps say what fills the memory and why it's still alive.
GitHub Copilot or Claude Code answers with Logsift's own tools: it searches your logs, groups exceptions, reads thread dumps and GC logs, and cites lines you click to see. Your coding agent can ask Logsift too, over MCP.
Ask a log or a CSV anything SQL can, in milliseconds over millions of lines.
Two exports in any order: added, removed and changed, value by value.
Count, sum and average any column of a log or CSV, by month or by value.
Open a .zip to pick its files or search them all; open logs from web addresses.
Its threads, profile and heap a click away. A line's thread opens its stack.
A dark mode for every view, the assistant too.
Free and open source. Download it, open a log, and see.
Logsift