Free · Private · No signup

Smart tools for everyday decisions.

Build your perfect Frappuccino, check wildfire smoke before a hike, or look up the moon on a special date. Runs entirely in your browser — no accounts, no tracking.

5 tools live now 0 trackers · No analytics 100% browser · No server state

Trending tools

How it works →
Summer 2026

Strato Frappuccino Calculator

Build a custom layered vanilla Frappuccino. See calories, sugar, and caffeine update live. Grande default 380 cal.

Open calculator Summer 2026

Firework Frappuccino Calculator

Berry-layered summer build with raspberry syrup. Grande default 410 cal. Sparkle dust and berry drizzle toggles.

Open calculator New

Fire Weather & Air Quality

Live AQI, PM2.5 smoke, fire risk, and 24-hour air-quality forecast for your location. Uses your IP if you skip geolocation.

Check your air New

Moon Phase Lookup

Current phase, illumination, and countdown to the next full moon. Look up the moon on your birthday or any date since 1900.

Check the moon

About Prefertools

Why we built this. Privacy, sourcing, and the roadmap for upcoming tools.

Read more

Why Prefertools? Most online calculators are bloated with ads, popups, and tracking pixels. Prefertools is a small set of focused tools that load fast, run entirely in your browser, and respect your privacy. No accounts, no email, no analytics.

Instant Results

Live updates as you customize

Copy-Ready Output

Barista orders, share links, forecasts

Smart Defaults

Sensible starting points, instant swaps

No Tracking

No cookies, no analytics, no accounts