Dev Toolbox is a free Chrome add-on developed by Chris Nanney that provides convenient offline access to a range of essential development tools. With this toolset, developers can easily perform various tasks without the need for internet connectivity.

The current tool set offered by Dev Toolbox includes the ability to calculate hashes, encode and decode HTML, URI, and Base64, convert numbers between different bases, parse and manipulate various time formats, format and inspect IPv4/CIDR addresses, and search all v13.1 emoji with quick copying.

One of the standout features of Dev Toolbox is its offline functionality. This means that developers can access and utilize the tools even when they don't have an internet connection. Additionally, the add-on only requires local storage permission to remember the last tool used and its input, ensuring a seamless and user-friendly experience.

Dev Toolbox is an invaluable asset for developers who require quick and reliable access to essential development tools. Whether you're calculating hashes, manipulating time formats, or inspecting IPv4/CIDR addresses, this add-on offers a comprehensive suite of tools to streamline your development process.