Retirement Lab
A tax-aware Monte Carlo retirement simulator for expats and geoarbitrage planners. Model real tax brackets across 31 countries, run 10,000 scenarios, and compare outcomes across borders.
retirementlab.appOne engineer, many agents.
Cedarwell Labs builds focused software products, pairing two decades of engineering judgment with a team of AI agents.
A growing catalog
Three products so far, each small and focused. More are in the works.
Cold Orders
A modern turn-based tactics game where foresight meets the fog of war. Anticipate your opponent, adapt to the unknown, and make every order count.
coldorders.com
Spec Butler
Give it a spec. Get back a merge. A local tool that takes Markdown specs through AI implementation, verification, review, and pull requests.
github.com/specbutler About
More on how I work at thiagohirai.com →
Cedarwell Labs is a software studio working out what comes next in how software gets built.
People set the direction; agents do the work. Each product in the catalog is useful on its own, and each is also a field test of how far that way of working can go.
What I learn along the way goes back into the process, and into the studio's own tools, like Spec Butler.
Get in touch
Questions about a product, feedback, or something you'd like to build together.