A fast disk space analyzer for Windows. Scan a drive, see where your space went, clean it up: live tree, zoomable treemap, file-type breakdown, search, and delete to the Recycle Bin.
Status: alpha. Works end to end, expect rough edges and breaking changes. Windows only; the portable crates build on Linux and macOS, there is just no UI for them yet.
winget install mathom
Download the MSI, setup.exe, or portable zip from Releases.
Not code-signed yet, so SmartScreen warns on first run: "More info", then "Run anyway". Reading the MFT needs administrator rights; mathom asks once at launch and falls back to the slower folder walker if you decline.
On NTFS volumes mathom reads the Master File Table directly instead of walking folders, and scans faster than WizTree in local tests. Results stream in while the scan runs, so the tree and treemap fill in live. Sizes are reported truthfully: logical vs. allocated, NTFS compression, sparse files, hardlinks counted once, OneDrive placeholders.
Also, a mathom is what hobbits call a thing they have no use for but can't bring themselves to throw away. Disks are full of them.
A cargo workspace. crates/core holds the tree model, treemap layout, and
search, with no platform-specific code. crates/scanner is the generic
parallel walker; crates/scanner-ntfs is the raw MFT reader, Windows-only.
src-tauri and ui/ are the Tauri v2 shell and the React front end. Both
backends implement the same Scanner trait; per scan the app picks MFT when
the volume is NTFS and the process is elevated, otherwise the walker.
Rust (stable, MSVC) and Node.js 20+.
cd ui && npm ci && cd ..
npm run dev # development app with hot reload
npm run build:app # release build + installers
cargo test --workspace