Best apps like Rule of Three - Calculator

10+ similar apps compared and reviewed

4.7 avg rating
10 free apps
Updated August 2026

Looking for something like Rule of Three? We've analyzed 10+ similar apps to help you find the best alternative. Each app is compared by ratings, features, and real user reviews, so you can make the right choice.

Top Alternatives to Rule of Three

Linear Interpolation Master#1

Linear Interpolation Master by VERVE TECHNOLOGIES PTY. LTD.

Linear Interpolation
Editor's Choice
🔧 Utilities
4.7(176 ratings)
FreeAdsIn-App Purchases
Linear Interpolation Master screenshot 1
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This tool simplifies linear interpolation calculations for industrial commissioning engineers. It features large, easily readable numbers for field use and allows for quick swapping of coordinate systems, such as converting between 4-20mA and 0-100% scales.

Units Converter Easy#2

Units Converter Easy by Arnau Egea

Fast and complet converter
Strong Contender
🔧 Utilities
4.0(4 ratings)
FreeAds
Units Converter Easy screenshot 1
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Units Converter Easy screenshot 5
Units Converter Easy screenshot 6

Easily convert between various units for distance, area, volume, weight, speed, temperature, and more. Supports conversions between different regional systems like Europe, the US, and the UK.

Calculator 17 - Math Solver#3

Calculator 17 - Math Solver by AI APPS SRL

Home Screen Widget
Worth Considering
🔧 Utilities
4.6😞(971 ratings)
Free
Calculator 17 - Math Solver screenshot 1
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This app offers a user-friendly calculator with basic and scientific modes. Access calculations instantly via a home screen widget and review past computations in a saved history.

What We Love

  • 👍 Convenient and easy to use
  • 💡 Excellent free app

Room to Improve

  • 🐛 Keyboard not functioning properly
  • 🐛 Widget not working or slow
  • 🐛 Screen sizing issues

More apps like Rule of Three

4
Recipe Scaler & Rule of Three
Recipe Scaler & Rule of Three
Recipe Scaler & Rule of Three
Direct proportion
Free

Instantly calculate proportions and simplify everyday math problems with this app. It features a recipe scaler to adjust ingredients and a rule of three calculator for quick, accurate solutions. An intuitive Q&A tool also helps solve homework-style questions.

Recipe scalingRule of three calculationQ&A problem solver
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(0)
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5
Regla de tres
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6
RULE OF THREE | NO ADS
RULE OF THREE | NO ADS
RULE OF THREE | NO ADS
Rule-of-three calculator
Free

This utility app simplifies calculations using the rule of three. It offers a straightforward interface for solving proportion problems, making it easy to find unknown values. The app is completely free and ad-free.

Rule-of-three calculationProportion problem solverSimple and intuitive interface
🔧 Utilities
(3)
free
7
PequeDosis
PequeDosis
PequeDosis
by Carlos Martin Coloma
Free
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(0)
8
Rule of 3: AI Calculator
Rule of 3: AI Calculator
Rule of 3: AI Calculator
Smart Proportion Ratio Solver
Free
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9
Three (Rule of 3 Calculator)
Three (Rule of 3 Calculator)
Three (Rule of 3 Calculator)
Simple everyday-use calculator
Free

This utility app helps users perform quick calculations for everyday scenarios like fuel consumption, currency conversion, and grocery shopping. It features a simple interface with options for result display customization and supports dark/light modes.

Rule of 3 calculationsCurrency conversionMeasurement conversions
🔧 Utilities
(2)
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10
The Date Calculator PRO
The Date Calculator PRO
The Date Calculator PRO
Calculate days between dates
Free

Easily calculate the duration between two dates, with or without accounting for the time of day. You can also add or subtract various time units from a specific date. The results are automatically converted into multiple units for your convenience.

Calculate duration between two datesInclude time of day in calculationsAdd/subtract years, months, weeks, days
🔧 Utilities
(2.6K)
free with in-app purchases