Simple Tools That Solve Annoying Problems

We build small, practical software tools designed to make everyday tasks a little easier.

Our tools are intentionally simple. No unnecessary accounts, complicated setup, or bloated features — just useful software built to solve a specific problem.

Chrome Extensions

Chase Authorized User Spending

Quickly calculate how much each authorized user spent on your Chase credit card during a selected statement or transaction period.

The extension works directly in your browser and does not send your transaction or financial information to our servers.

Free Chrome Extension

Built to Be Useful

Key Building Blocks is an independent software project focused on creating straightforward tools for problems that don’t need complicated solutions.

Some tools start because we need them ourselves. When they turn out to be useful, we make them available for others too.

About Key Building Blocks