Life & fun · alternatives · 2026

24 alternatives to Rechner Calculator 2.0

AppleWatch version for the tiniest of maths

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Rechner Calculator 2.0 launched in 2015; newer entries below may have overtaken it.

1. 1
   Off Of▲90

   A Simple Percentage Calculator for iOS

   2014 · its alternatives →

2. 2
   Tydlig▲69

   The calculator reimagined for iOS 7

   2013 · tydligapp.com · its alternatives →

3. 3
   Recher Calculator▲58

   Awesome gesture-based calculator. Beautifully designed.

   2014 · rechner-app.com · its alternatives →

4. 4
   KnightOS▲136

   An open-source OS for calculators

   2016 · its alternatives →

5. 5
   I made a web-based notepad with a built in unit calculator▲488

   I launched NumPad v1 on here a few years ago, and back then it wasn't much more than a thin CodeMirror wrapper around the calculator engine I'd written. Now I've rewritten it as a PWA that supports multiple documents, persists them to IndexedDB, and has a syncing service for paying customers. Syncing is handled by Automerge[1] under the hood, which should make it relatively easy to get document sharing working too. [1] https://automerge.org/

   2022 · numpad.io · its alternatives →

6. 6
   Calcbot 2.0 for iOS▲104

   The Intelligent Calculator & Unit Converter

   2015 · apps.apple.com · its alternatives →

7. 7
   Tchisla▲62

   Calculator game with numbers

   2017 · apps.apple.com · its alternatives →

8. 8
   Calca▲87

   Symbolic calculator

   2014 · calca.io · its alternatives →

9. 9
   Tipping▲112

   Ridiculously quick tip calculator

   2016 · its alternatives →

10. 10
    Tydlig▲57

    A new kind of Calculator for iPhone & iPad

    2013 · store.steampowered.com · its alternatives →

11. 11
    6284 Calc▲137

    An app that does your math & science homework for you 🤓

    2017 · apps.apple.com · its alternatives →

12. 12
    Calculator▲57

    Calculator with a history

    2022 · whowideweb.com · its alternatives →

13. 13
    Numerical▲70

    Calculator Without Equal

    2014 · its alternatives →

14. 14
    Tip▲63

    A simple tip calculator for iphone

    2014 · its alternatives →

15. 15
    Rizon▲25

    A beautiful Golden Hour calculator for iOS

    2015 · reiseversicherung.de.com · its alternatives →

16. 16
    Mathematics+▲78

    Your source for daily math workouts!

    2016 · its alternatives →

17. 17
    IOS Calculator for Android▲63

    Visually Impressive Highly functional All-in-one!

    2016 · play.google.com · its alternatives →

18. 18
    Plusly Calculator▲58

    Simple, powerful, and redesigned calculator for Apple Watch

    2022 · its alternatives →

19. 19
    Tempo for Apple Watch▲117

    A new, intuitive way to see your day at a glance

    2015 · tempo.ai · its alternatives →

20. 20
    Calcbot for Apple Watch▲114

    Calculate, convert, and split tips from your wrist

    2015 · tapbots.com · its alternatives →

21. 21
    Elevate for Apple Watch▲76

    Improve your writing and math skills from your wrist

    2015 · apps.apple.com · its alternatives →

22. 22
    MiniCalc for Apple Watch▲10

    Minimalistic Calculator designed for your wrist.

    2015 · fichek.com · its alternatives →

23. 23
    NUM▲74

    Insanely hard math game on iOS

    2015 · its alternatives →

24. 24
    NUM▲109

    Insanely Hard Math Game

    2014 · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →