Independent apps for iPhone, iPad & Mac

Apps that keep
to themselves.

AISixteen builds small, fast, thoughtfully crafted apps that run on your device — no accounts, no tracking, nothing about you sent to a server.

Explore the apps Our privacy stance

16apps shipped

0data collected

0accounts needed

The sky, computed for any moment. Natal charts, transits, synastry and returns — computed on your device.

Ephemeris Sky screenshot

Catalog

All apps

Every one collects nothing, and all but Earth Around run fully offline.

AllGamesCreative toolsAI & utilitiesSky & science

The sky, computed for any moment.

Twenty exact audio tools in one app.

Summarize anything, fully on-device.

Master your typing speed, the fun way.

Golden Ratio Calculator

Precise golden-ratio math, instantly.

Golden Ratio Calculator Lite

The golden ratio, simplified.

A cosmic, choose-your-path story.

Skyscraper Frog

8-bit leaping across the rooftops.

Monstro Shooter

Survive the alien invasion.

The field calculator that shows its work.

The E6B you can trust on a checkride.

Watch the Sun, from your wrist.

Tides, currents and celestial navigation.

The financial calculator that cites its sources.

Layout, lumber and takeoff, on site.

The offline air-side HVAC calculator.

Privacy by default

Our apps do not collect, store, or transmit any personal data — no identifiers, no usage analytics, no device information. Nothing about you leaves your device. There's no account to create and nothing to opt out of, because there was never anything to collect.