Indie developer from Ukraine. 10+ years building offline Windows tools for factories and retail. Now building LockMargin - a local Financial OS for freelancers: invoicing and time tracking that never leave your laptop.
No cloud, no subscription. $49 once. I write the code, I answer the emails.
LockMargin is a local Financial OS for freelancers. Time tracking,
invoicing with immutable snapshots, clients, projects, expenses - one encrypted SQLite file on your machine. AES-256-GCM. No cloud, no subscription, no account.
$49 once. Windows (Early Access September 2026); macOS and Linux coming soon.
Website: https://lockmargin.com
Writing about local-first software, data ownership, and the engineering behind LockMargin.