Best Blabr Alternatives & Competitors in 2025

The open-source, web-based thinking tool that facilitates effective thinking for solving problems.

Open Source freemium $4.0 / Monthly

Interactive JavaScript notebooks - create good-looking, responsive, interactive documents.

Soulver is a software application that functions as a calculator that allows you type a continuous stream of information rather than having to input data into multiple cells.

Numi is a beautiful text calculator for Mac.

Open Source

OpalCalc is a brand new type of calculator for the PC.

Project Jupyter exists to develop open-source software, open-standards, and services for interactive computing across dozens of programming languages. Ready to get started? Try it in your browser Install the Notebook.

The portfolio and technical blog of Chris Henrick – provider of professional web development, data visualization, GIS, mapping, & cartography services.

Interactive, notebook programming environment for the web.

RunKit notebooks are interactive javascript playgrounds connected to a complete node environment right in your browser. Every npm module pre-installed.

Simple viewer for sharing code examples hosted on GitHub Gist.

The Collaborative Computational Notebook Built for Modern Engineering.

iPython provides a rich toolkit to help you make the most out of using Python interactively.

Simple yet very effective calculator with print capabilities and log registration.