TreeSheets

Active

Country: Netherlands (NL)
Founded: 2008
Developer: Wouter van Oortmerssen
Pricing: Free (open-source)
Open source: Yes
Platforms: Windows, Linux, macOS

Indexes

Spreadsheets

Overview

TreeSheets is a hierarchical spreadsheet designed as a replacement for spreadsheets, mind mappers, outliners, PIMs, text editors, and small databases. It supports data organization for todo lists, calendars, project management, brainstorming, planning, and requirements gathering through a familiar spreadsheet interface enhanced with hierarchy.¹²³

Key Features

Hierarchical Structure - Organizes data in nested sheets like a multi-dimensional spreadsheet.
Tabbed Interface - Supports multiple sheets within a single lightweight, fast application.
Data Visualization - Allows color coding and easy navigation through nested data structures.
Cross-Platform Support - Runs on Windows, Linux, and macOS with low system resource usage.
Flexible Organization - Handles todo lists, calendars, brainstorming, and project management.
Mind Mapper Alternative - Provides compact, organized visualization more structured than traditional mind maps.
Outliner Functionality - Supports multi-dimensional outlining beyond linear structures.

Pricing

Plan	Price	Includes
Free	$0	Full access to all features, open source.

Platforms & Requirements

TreeSheets runs on Windows (Vista through Win11), Linux, and macOS, including Apple Silicon like M2 MacBook Air. It is lightweight with low resource usage even for large files and available as portable ZIP for Windows without installer. No specific minimum requirements listed beyond 64-bit compatibility on supported platforms.³⁵

Integrations & Ecosystem

GitHub source code access
Discord community
Google Groups discussion
zlib License
Import/export via native file format
Bug reporting and feature requests on GitHub

Alternatives

App	Difference
Obsidian	Markdown-based note-taking with graph views, less spreadsheet-like than hierarchical sheets.
XMind	Dedicated mind mapping tool with less spreadsheet functionality and hierarchy.
Freeplane	Free mind mapping software, more focused on nodes than tabular data.
Notion	All-in-one workspace with databases, web-based unlike native desktop app.

Reputation

TreeSheets is recognized as a mature, distraction-free tool for hierarchical data organization, praised for combining multiple productivity app types into a lightweight package. Users appreciate its cross-platform availability and open-source nature, though some note its dated interface after over a decade of development. Community discussions continue via Discord and Google Groups, with ongoing GitHub releases indicating active maintenance.³⁶

Sources (7)