RK-89: Symbolic Graphing Calculator at App Store analyse

App power index: 100 (based on ranks around App Stores today)
Utilities Education
Developer: Knign LLC
Price: 0 free
Current version: 0.9.2, last update: 7 years ago
First release : 01 Dec 2009
App size: 1.54 Mb
4.3 ( 1383 ratings )
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Estimation application downloads and cost

> 2.2k
Monthly downloads
~ $ 900
Estimation App Cost


Welcome to version 0.9a of RK-89.

RK-89 is the latest release in the most advanced graphing calculator suite available on the App Store. RK-89 introduces symbolic calculation features to the RKalk engine that already powers RK-83.

Were dedicated to making sure your experience with RK-89 is absolutely unprecedented. This early release gives you access to the powerful new features offered by RK-89 and allows us to gather the crucial user feedback we need to keep RK-89 on the cutting edge. Count on the same fast-paced development schedule that thousands of RK-83 users already enjoy; expect updates as quickly as the App Store approval process allows.

The already robust RKalk libraries include:
- numerical integration and solvers
- list and matrix manipulation
- descriptive statistics
- trigonometric and other standard math functions

RK-89 version 0.9a builds on this rock-solid foundation, adding these math and programming features:
- conditions, loops, and boolean operators.
- list creation. `seq(expression, variable, low, high, [step])`
"seq(X^2,X,0,5)" ==> "{0,1,4,9,16}"
- anonymous functions. `func(variable, value expression)`
"func(X,Y,X+Y)->G", "G(3,5)" ==> "8"
- symbolic integration. `integrate(expression, variable)`
"integrate(X^2, X)" ==> "(1/3)x^3"
- symbolic derivatives. `deriv(expression, variable)`
"deriv(X^2, X)" ==> "2x"

Version 1.0 will include arbitrarily precise calculation, symbolic limits, extensions to the existing programming interface, expanded symbolic calculus and statistics routines, and more.

We need your feedback to keep improving RK-89. Tell us what you think.

[email protected]
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Available in countries
Country Price
Canada 27.99 CAD
China 128 CNY
France 19.99 EUR
Germany 19.99 EUR
Italy 19.99 EUR
Netherlands 19.99 EUR
Portugal 19.99 EUR
Spain 19.99 EUR
Poland 19.99 EUR
UK 14.99 GBP
India 999.99 INR
Japan 999.99 JPY
Russia 999.99 RUB
Turkey 52.99 TRY
USA 19.99 USD
Korea, Republic Of 21.99 USD
Ukraine 19.99 USD
Available for devices
iPhoneFirstGen, iPodTouchFirstGen, iPodTouchSecondGen, iPhone3G, iPhone3GS, iPadWifi, iPad3G, iPhone4, iPodTouchThirdGen, iPodTouchFourthGen, iPad2Wifi, iPad23G, iPhone4S, iPadThirdGen, iPadThirdGen4G, iPhone5, iPodTouchFifthGen, iPadFourthGen, iPadFourthGen4G, iPadMini, iPadMini4G, iPhone5c, iPhone5s, iPadAir, iPadAirCellular, iPadMiniRetina, iPadMiniRetinaCellular, iPhone6, iPhone6Plus, iPadAir2, iPadAir2Cellular, iPadMini3, iPadMini3Cellular, iPodTouchSixthGen, iPhone6s, iPhone6sPlus, iPadMini4, iPadMini4Cellular, iPadPro, iPadProCellular, iPadPro97, iPadPro97Cellular, iPhoneSE, iPhone7, iPhone7Plus,