React Complex Tree VS Calcumber

Compare React Complex Tree VS Calcumber and see what are their differences

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React Complex Tree

Unopinionated accessible tree component with drag and drop

Calcumber

Calculate in a notebook and share — from everyday math to engineering.

Visit Website

Landing page //
2023-10-14

Usefulness of units when calculating the weight of paper //
2026-07-25
Calcumber interactively embedd on a web page //
2026-07-25
Showcase from arithmetics to thermodynamics //
2026-07-25

Use variables, functions, and units and see results immediately. Add comments, copy calculations to apps like Word or Excel, or share them through an editable link. Calculate thermodynamic fluid properties with the integrated CoolProp library.

React Complex Tree

Website: rct.lukasbach.com
$ Details
Platforms: -
Release Date: -

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Calcumber

Website: calcumber.app
$ Details: free
Platforms: Web Windows Linux Mac
Release Date: 2025 June
Startup details
Country: Switzerland
State: Aargau
City: Staufen
Founder(s): Samuel Hartmann
Employees: 1 - 9

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React Complex Tree features and specs

Customizability
React Complex Tree offers a high degree of customizability, allowing developers to tailor the tree component to fit their specific needs. This can be especially useful for creating unique UI experiences.
Feature-Rich
The library includes a wide range of features out of the box such as drag-and-drop support, keyboard navigation, and dynamic data loading, which can save development time.
Accessibility Support
React Complex Tree is designed with accessibility in mind, providing support for ARIA attributes and keyboard interactions, which helps ensure that applications are usable by people with disabilities.
Performance
The component is optimized for performance, handling large data sets efficiently without significant slowdowns, which is critical for applications that manage extensive hierarchical structures.
Community and Documentation
The library has a supportive community and well-structured documentation, providing developers with ample resources to troubleshoot and extend its functionality.

Possible disadvantages of React Complex Tree

Complexity
Due to its extensive features and customizability, React Complex Tree can be complex to set up and configure properly, which may lead to a steeper learning curve for new users.
Bundle Size
As a feature-rich component, React Complex Tree can increase your bundle size, which might be a concern for projects where performance and loading time are critical.
Third-Party Dependency
Relying on a third-party library introduces dependencies outside of your control, which may present challenges in terms of long-term maintenance and potential update or deprecation issues.
Specific Use Case Tailoring
While it offers a lot of features, developers may find that very specific use cases require additional effort to customize or extend the component beyond its intended use.

Calcumber features and specs

🌿 Naturally type expressions
get immediate results
🔗 Copy and share
keep calculations editable with a link
🧩 Variables and constants
pi, e, G, mu0
🧪 Scientific functions
sin, acos, log, round, and more
♨️ Thermodynamic fluid properties
refrigeration, heat pumps, steam and air
💡 Installation optional
run directly in your browser
📱 Multi-platform
WebApp, Windows, more to come

Analysis of React Complex Tree

Overall verdict

React Complex Tree is a solid, headless React library for building tree-view UI components, offering strong accessibility support, drag-and-drop, multi-selection, and search out of the box, while giving developers full control over styling and rendering. It's a good choice for developers who need a robust, unstyled tree component without reinventing complex interaction logic.

Why this product is good

Headless design gives full control over styling and markup, making it easy to integrate with any design system or CSS framework
Built-in accessibility (ARIA-compliant, keyboard navigation) saves significant development time
Supports advanced features like drag-and-drop reordering, multi-selection, and renaming out of the box
Actively maintained with good documentation and TypeScript support
Flexible data model that supports both controlled and uncontrolled tree state management
Free and open-source with no licensing costs

Recommended for

Developers building file explorers, folder structures, or nested navigation menus
Teams that need a customizable tree component that matches their existing design system
Projects requiring accessible, keyboard-navigable tree interfaces
Applications needing drag-and-drop reordering of hierarchical data
TypeScript-based React projects seeking type-safe tree components
Developers who prefer headless UI libraries over pre-styled component kits

Category Popularity

0-100% (relative to React Complex Tree and Calcumber)

React Complex Tree

Calcumber

Developer Tools

100 100%

Developer Tools

0% 0

Education

0 0%

Education

100% 100

Design Tools

100 100%

Design Tools

0% 0

Engineering Calculator

0 0%

Engineering Calculator

100% 100

Questions & Answers

As answered by people managing React Complex Tree and Calcumber.

Why should a person choose your product over its competitors?

Calcumber's answer:

Sharing calculations and embedding them in documents or web pages is perfect for education.
Natural unit support, just include them in your expression and Calcumber handles it.
Free and easy access to thermodynamic fluid-properties.

What makes your product unique?

Calcumber's answer:

Easy to use calculator notebook
From simple arithmetic to advanced engineering with units
Installation optional
Send calculation link with full privacy
Embed calculation templates, exercices and soultions in documents or interactively in web pages

What's the story behind your product?

Calcumber's answer:

When starting for a Master of Advances Study in Energy Systems, I was looking for a suitable state-of-the-art calculator. Then I built my own Calculator Calcumber and now the Eastern Switzerland University of Applied Sciences is using Calcumber for teaching students in thermodynamics.

How would you describe the primary audience of your product?

Calcumber's answer:

The notebook-style calculator is great for everybody who wants more than just a single line calculator.
The sharing and embedding features make it Calcumber very well suited for teachers and students. The power of consistently using units is shown immediatly.
Engineers will like the unit support, sharing calculations with collegues and if needed the built-in fluid properties calculation.

Which are the primary technologies used for building your product?

Calcumber's answer:

HTML, CSS, TypeScript, PWA, CoolProp

Who are some of the biggest customers of your product?

Calcumber's answer:

Eastern Switzerland University of Applied Sciences

User comments

Share your experience with using React Complex Tree and Calcumber. For example, how are they different and which one is better?

Social recommendations and mentions

Based on our record, React Complex Tree seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

React Complex Tree mentions (2)

I'm building react-complex-tree, an unopinionated tree component for react, and recently released a new version!
You can find the source code for it at https://github.com/lukasbach/react-complex-tree, and documentation and examples at https://rct.lukasbach.com. Source: over 3 years ago
I made an Unopinionated Accessible Tree Component with Multi-Select and Drag-And-Drop
More examples on the customizability, in-depth documentation and a typing API is available at the documentation homepage: https://rct.lukasbach.com/. Source: about 5 years ago

Calcumber mentions (0)

We have not tracked any mentions of Calcumber yet. Tracking of Calcumber recommendations started around Jul 2026.

What are some alternatives?

When comparing React Complex Tree and Calcumber, you can also consider the following products

Pagedraw - Beta release - Compile UI Mockups to React Code

Numara Calculator - A simple but powerful notepad calculator which evaluates expressions as you type.

Pagedraw - Beta release vs React Complex Tree

Pagedraw - Beta release vs Calcumber

Numara Calculator vs React Complex Tree

Numara Calculator vs Calcumber