TreeLens

Free plan Windows

What TreeLens is

TreeLens is a free, open-source, portable disk-space visualizer for Windows. It scans folders and drives with a parallel directory walk across NTFS, exFAT, ReFS, and network shares. A squarified treemap displays disk usage using file-type colors and an age-heat mode for modification age. Its file explorer can create, rename, open, and delete files, with deletions sent to the Recycle Bin. Analysis tools provide checksums, file comparison, duplicate finding, and offline utilities for detecting, extracting, or embedding steganographic data. Users can export subtrees to CSV or JSON and save or reopen scans as portable .treelens snapshots. The NTFS $MFT fast path requires an elevated scan beginning at an NTFS volume root; otherwise a standard directory walk is used. Downloads include portable and installer versions plus SHA256SUMS.txt. Release binaries are unsigned, so Windows may show unknown-publisher warnings.

Who it suits

TreeLens suits Windows users who want a portable, no-cost visualizer for disk usage and file analysis. It also fits users seeking offline tools and exportable scan snapshots.

What it does well

Free forever under an MIT license
Supports NTFS, exFAT, ReFS, and network shares
Treemap includes file-type and age views
Exports CSV or JSON reports
No server component or telemetry

What to know first

Windows only
Release binaries are unsigned
Fast NTFS path needs elevated root scan
Multi-drive overview is future roadmap work

Plans

Plan	Billed and limits	Price
Free	Free forever · open source · MIT license	Free

As github.com lists them, read 11 Oct 2026. The maker's own page has the final word.

Verdict

TreeLens combines visual disk analysis, file operations, duplicate finding, and portable scan exports without a server component. Windows users should account for unsigned-release warnings and the conditions required for its fastest NTFS scan.

Facts from TreeLens's own pages

Analysis: It includes checksums, file comparison, duplicate finding, and tools to detect, extract, or embed steganographic data. · github.com, 11 Oct 2026
Downloads: Downloads include a portable executable, an NSIS setup installer, and SHA256SUMS.txt for verifying files. · github.com, 11 Oct 2026
Export and snapshots: Users can export a subtree to CSV or JSON and save or reopen scans as portable .treelens snapshots. · github.com, 11 Oct 2026
Exportable reports: Yes · github.com, 22 Sept 2026
Fast scan limit: The NTFS $MFT fast path requires an elevated scan of an NTFS volume root and otherwise falls back to a standard directory walk. · github.com, 11 Oct 2026
File tools: Its file explorer can create, rename, open, and delete files, with deletes sent to the Recycle Bin. · github.com, 11 Oct 2026
File-type breakdown: Yes · github.com, 22 Sept 2026
Free plan: Yes · github.com, 22 Sept 2026
License: TreeLens is MIT-licensed. · github.com, 11 Oct 2026
Desktop platforms: windows · github.com, 22 Sept 2026
Privacy: The maker describes TreeLens as a client-side desktop app with no server component or telemetry; its steganography tools run offline. · github.com, 11 Oct 2026
Purpose: TreeLens is a free, open-source, portable disk-space visualizer for Windows. · github.com, 11 Oct 2026
Roadmap: The roadmap lists a multi-drive overview and scan-to-scan change comparison as future v0.x work. · github.com, 11 Oct 2026
Scanning: It scans folders and drives using a parallel directory walk and supports NTFS, exFAT, ReFS, and network shares. · github.com, 11 Oct 2026
Scan scope: files_folders · github.com, 22 Sept 2026
Treemap: It displays disk usage in a squarified treemap with file-type coloring and an age-heat mode for modification age. · github.com, 11 Oct 2026
Treemap view: Yes · github.com, 22 Sept 2026
Unsigned binaries: Release binaries are unsigned, so Windows SmartScreen and UAC may show warnings identifying the publisher as unknown. · github.com, 11 Oct 2026

Where TreeLens stands on Freedom251

Disk Space Analyzers#56 of 105