Independent software & game studio
Lonsdaleite I/O creates privacy-minded software for everyday life and deeply considered games for players who want systems that matter.
What we're building
From personal finance to interstellar strategy, our work is grounded in clarity, privacy, and systems with real depth.
Professional software
In DevelopmentAn offline-first personal finance manager for Windows that brings accounts, transactions, envelope budgeting, and goals together—without putting your financial life in the cloud.
Product page coming soon
Strategy games
In Early DevelopmentA deterministic multiplayer space 4X shaped by orbital mechanics, light-speed communication delays, and deeply customizable starships.
How we work
Every feature earns its place, whether it helps organize a household or command a fleet.
We minimize unnecessary data collection and design privacy into each product from the start.
We build clear, durable experiences for people who value thoughtful tools and meaningful depth.
About Lonsdaleite I/O
We make focused products for Windows and the web—from practical, privacy-conscious software to ambitious games built around deep simulation. The category changes; the commitment to clarity, reliability, and respect for the user does not.
Envelope and Halcyon Depths are both in active development. Follow along as the products grow.
View our products