Notes on building calmer money software.
Long-form essays, engineering deep-dives and the occasional company update. We write when we have something to say.
Building a rules engine that doesn't fight the user
How we ship a deterministic, debuggable, no-magic categorization system that handles 200+ vendors.
Why everything in Spendbox has spring physics
A short note on why we use motion as feedback, and how we picked our default stiffness and damping.
2025 in review: revenue, what we built, and what we got wrong
Open metrics, real lessons, and a roadmap for the year ahead. We share what most companies hide.
Subscription math: the $19/mo trap
What happens when 12 small subscriptions creep up on you — and the simple framework we recommend.
Why we'll never ask for bank access
There's a better way to track money than handing over your credentials. Here's how forwarding works.
How to audit your subscriptions in one hour (and never be surprised again)
A complete guide to finding every recurring charge, applying a simple 3-question framework, and automating the whole thing so your list stays current forever.