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Web product
Added August 20, 2026
About the product
Trusty Calculator offers 433 free tools with transparent formulas, assumptions, units, worked examples, and primary sources.
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For product owners
Promote Trusty Calculator
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 direct link to Trusty Calculator from a DR45 site (Ahrefs Domain Rating), with no redirect in between.
- 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.
For ownersOwn Trusty Calculator? You can add a deal, post a role or put the badge on your own site.