Every year Sindre Sorhus posts the last-compatible free build of each of his paid Mac apps for users who can’t or won’t upgrade past macOS 15. Dato, Lungo, Battery Indicator, the lot — going back to 10.13.

Sindre Sorhus is among the most prolific indie developers on the Mac platform. He ships dozens of small paid utilities — Dato (the menu bar calendar that quietly replaces the system clock for a lot of people), Lungo (one click stops your Mac going to sleep), Battery Indicator (the battery-time-remaining readout Apple removed), and a long tail of niche tools. Most are modest one-time purchases or small subscriptions.

The Older Versions page is the part that earns its place here. Each time a new paid build ships requiring the latest macOS, the previous build is hosted free for everyone still on the older OS. The current page covers macOS 15 down through 10.13. Click the app, download the .zip, drop it in /Applications. Code-signed, notarised, no account or upgrade nag.

The cumulative effect is a quiet guarantee: if you buy a Sindre app today, you’re not paying for an upgrade treadmill. Stick on Sonoma in 2027 and the macOS-15-era build will be sitting on the page, free, runnable. The same goes for everyone else who can’t afford a new Mac, won’t trust the next OS, or simply hasn’t rebuilt their muscle memory yet.

This is rare in the App Store age, where stuck-on-old-macOS users routinely lose access to apps they paid for. Sindre’s gesture covers his entire catalog. The page itself takes thirty seconds to skim — the work behind it is the part that matters.