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Added August 20, 2026

Trusty Calculator

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About the product

Trusty Calculator offers 433 free tools with transparent formulas, assumptions, units, worked examples, and primary sources.
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Every listing gets one post to our X and Threads followers. It is seen once, then the traffic stops. Promotion keeps Trusty Calculator in front of people instead.

  • Back in the X and Threads rotation. Trusty Calculator gets posted again instead of once.
  • A promoted slot on the AppRater homepage, carrying a Promoted badge.
  • A labelled spot in the weekly email to AppRater subscribers, one promoted app per issue.
  • Stays on the first screen however old the listing is, while new submissions push everything else down.

Monthly promotion

$14USD per month

Card, Apple Pay and more, through Whop. Starts straight away.

  • Cancel any time from the Whop account you paid with, or email [email protected] and we will do it.
  • The promotion starts straight away, no waiting on us.
  • Whop handles the checkout. We never see your card.

Questions first? Email [email protected].

For ownersOwn Trusty Calculator? Add a deal or post a role, and it shows up right here.

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