Grapher

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# Description

**Grapher**is an effective equation plotter, capable of drawing any function, solving equations and calculating expressions. Especially if you're a student, teacher or engineer, this app is made with you in mind! A wide range of predefined functions is available, including trigonometric & hyperbolic functions, differentiation and more. Anything you type will be processed and displayed instantly by a powerful math engine, in both 2D and 3D modes.

Grapher is continuously under development, with more features yet to come. Any feedback and bug-reports are greatly appreciated. This free version is ad-supported, please consider buying Grapher Pro to remove all ads and enjoy extra features!

**Curve types**

• Function (cartesian)

• Polar

• Parametric

• Implicit equation

• Implicit inequality

• 3D Function

• 3D Parametric curve

• 3D Parametric surface

**More features**

• Equation solver (numerical)

• Find roots, extrema and intersections with other functions

• Custom math keyboard

• Auto-detect input type

• User variable support

• Editable parameter range (for polar & parametric curves)

• Input history

• Plot up to 24 graphs at once

• Differentiation (numerical)

• Trace graph

• Capture screenshots

__Note__: Mathematical functions should be typed by their names, for example sqrt(x) means √x. Hold a key to see all function names starting with that letter. If something is unclear, be sure to check out the 'Help' page as all details are summarized there.

My review

Review from

# Reviews

4.5

3,876 total

5 2,799

4 636

3 205

2 75

1 161

Nitish Singh Parihar

Very good but may become best I am giving it 5 stars. App is really cool and helpful but it can be better if you introduce some easy input keyboard and superscript and subscript feature. Secondly, it becomes little confusing with use of brackets(it takes some time to identify composite functions). Overall, I love the app.

Anand Kumar

Have seen many apps, this one's best I like plotting graphs of many mathematical functions, which i come across. So I needed an app which could plot all kinds of graphs. I searched many apps but didn't find any which had too many functions with such a great simplicity. This app even has max and min functions which I found in none of other apps.

jonathan adam

best grapher. Not a good basic calculator Easy to use, extensive marh functionality, and able to display very many simultaneous graphs. Works quickly and is small. .......Could better if there were a way to see old entries for basic calculator. Not actually a good replacement for a basic calc.

Kapil Deshmukh

Technical mistakes keep me from giving it a higher score. Graph of fpart(x) is always sketched wrong on the -ve x axis side. Grapher is a gem with a lot of flaws which get hard to ignore the further you depend upon it. As far as I know, the range should be (1,infinity). Don't make me say Heck, I'm a good Christian man.

Bits Maker

Awesome app. But I found an error that when I wrote the equation of tangent to circle then it didn't show it correctly. I wrote tangent as : y=x+9*2^1/2 for circle x^2+y^2=9. I found a little bug. It's related to calculation of expression. Please tell me your email address to send you the proof

Ethan Partidas

Good This app works great for graphing 2D and 3D functions and parameterizations. The only things that it is missing are a hide feature for when dealing with a large number of graphs and better support for entering long parametric definitions that don't fit in the provided window, causing the need to scroll for long periods of time and a possibility of getting lost between the definitions of x, y, and z.

User reviews

Basile Van Hoorick January 17, 2017

Hi, I will take your feedback into account! Basile Van Hoorick February 4, 2018

Hi, thanks for your rating! Mail me at bvh@outlook.be App is great, very easy to use and good level of control. One thing I would love to see is the ability to save a workspace. Sometimes I will have several dozen functions graphed simultaneously as part of a single exercise which may have take some time to put together, and then if I switch to graphing something totally different, I can't get back to what I had before and have to recreate it from scratch. Rather than just having the screenshot functionality, I would love to see the ability to save an entire collection of functions to revisit at some other time. Thanks

Simply the Best 3D Graphing Calculator I love the variety in types of functions available and the feesible interface for a free app. However, the parameters for parameteric equations dont change graphically when I change their settings. Uhmmm...

This app is very good in almost all criteria but just 1 major major fault that gives it 3 star. That is it makes graph of( fractional part of x) wrong I.e, {x} even I tried x- ipart of x I.e., x- [x] then also it is below x axis for x<0 whereas it should be positive . More over there is one interesting fault there is a theorem that acot(x) +atan(x) =pi/2 if you enter acot(x) then graph is wrong but if you enter pi/2 - atan(x) then it is correct I think there is some serious fault plz correct it !!!!!!!!!!!!!!!!!!! @#$%&******

Its a very good app. I like it so much. It helps me to draw some graphs of Math which seems to me very difficult.. But,This app has made that easy

Lovely even at such weight but please add other functions to it Make your keyboard for maths function, not typing Also the 3d graph is in half, complete the coordinate by giving each axis 180°

Needs a redo button for when you gotta go out really far without it takes really long to get back to the origin other than that it's great

Basile Van Hoorick March 10, 2017

Swipe keyboard to the left or right to go to the start or end of your input. It's so great it helped me pass a math test but now i have absolute values in my functions and i can't put any absolute values it"s so frustrating but i can still do all other kinds THANK YOU

I loved it sooo much! But can't find the screen captures I helps me to analyze all the important graphs in maths. But I can't understand where the screen captures are saved. I can't find it

Basile Van Hoorick November 11, 2016

The Gallery app should show an album called Grapher. If it doesn't: the files are saved to the \Grapher folder on your internal sd card (you can browse to it using a file manager). Awesome App, Really Helpful for students out there.. Just add one feature of an implicit function which x,y as well as z constraints.. (if possible) It would make the App perfect and second to none.

Quite good app, I don't use it much but have just spotted a mistake. Fotlr function f(x)=y^0 it shows function value in 0 as 1, but function f(x)=y^0 isn't continuos at 0 and thus it's function value isn't 1. It isn't event defined at this point.

Basile Van Hoorick May 1, 2017

Hi,
The point at y=0 is a removable discontinuity. Such points are infinitely small and thus invisible on a graph.
However, Grapher still shows 0^0 as 1. Strictly speaking, it should be undefined but for practical purposes its value is often defined to be 1. So the function y^0 is actually a continuous extension, which equals 1 everywhere.
Regards please thanks, don't mind ads but please don't allow the obnoxious flashing ones. no need for that.

Is there any way to restrict a single variable function up to a given Range Eg. How can I restrict f(y)= 5y^2 between 0 <y<3 ? Hats Off ! to the developer for building such an app. It really helped a lot..

This app is great indeed. It works soomethly and fast besides it can produce 3D graphs.Overall great but it'll be a pleasure if some features of a basic calculator is added.

Would be a great app if you could get rid of the ads, as they use a lot of space and make your screen look very crowded.

Very good, BUT please update the design, especially the icon! It's horrible...

I use this exclusively for 3D graphing, and it was the only free app I could find that would allow graphing of curves in a r(t)= format

Great app but one little confusion Awesome app . Allows me to visualize the equations instantly. One question though. How do you graph circles on it?

Basile Van Hoorick October 11, 2016

Thx for your rating ;)
Simply type the equation of a circle, for example x^2+y^2=4.
This is an implicit equation, but it's also possible using a polar equation with constant radius: r(θ)=2. Here you'll need to type "2" and manually select "Polar". Amazing app! excellent design and very helpful... but please consider having a few more functions at a time and also mod and greatest integer functions

This is arguably one of the best apps available for graphing! Inputing the fuctions can become tricky sometimes, but it's extremely helpful.

Wrong result I got bad core in my exam. Pls check its code out again

Basile Van Hoorick September 12, 2016

Hi, please send me your input that gives an incorrect result. Can't understand how to draw polar curves There is no 'theta' sign

Basile Van Hoorick September 25, 2016

Hi, Greek letters are not supported for now so the 'theta' sign is substituted by 't'. For example: typing t^2 means r=theta^2. Good app ! It is good but , it do not show the negative part of y=√x

Basile Van Hoorick January 17, 2017

Hi, the square root of a negative number does not exist unless you use complex numbers, which is supported in Grapher Pro. Best out there. Work on the UI a but to make it more attractive. But in terms of working , nothing comes close . Simply amazing.

Graph plottings are incorrect; often showing mirror images of the original graph.

I salute u U deserve a salute since u hav made such a perfect app. I would hav touched ur feet as token of respect if u were in front of me

Keyboard is not good Not have mod sign and many sign.

Basile Van Hoorick September 12, 2016

Hi, modulo operator is % or mod: 8%3 = 8mod3 = 2. I'm not sure what 'many sign' means, but you could check out the help page to view all operators. Wrong results (x^2-4)^1/2 is a hyperbola but this graph is showing it as parabola

Basile Van Hoorick December 1, 2016

Hi, try (x^2-4)^(1/2) with brackets around 1/2, or sqrt(x^2-4). Exponentiation has higher precedence than division. Fantastic app It's really awesome, it's help me to feel the abstract of an equation

It lets us visualise what we cannot imagine very easily, which makes this app so good.

Basile Van Hoorick June 10, 2017

Hi, cos(x) should be graphed correctly, please let me know which part appears wrong. So very helpful... big thanks to whoever made this... cant be more grateful

This is a great app but it really needs 3D implicit function graphing (for example x^2+y^2+z^2=16).

Review deleted

# What's New

Grapher 1.4.1

• Stability and UI improvements.

Grapher 1.4

• Pro (ad-free) version released. Check it out to enjoy many new features including complex numbers and parameter sliders!

• Implicit inequality plots

• User-defined function variables

• Performance improvements

• Hold a key to see function names

• logn(x) and E notation support

• And many more features & fixes

# Additional information

Updated

September 9, 2016

Installs

500,000 - 1,000,000

Current Version

1.4.1

Requires Android

2.3 and up

Permissions

Report

Flag as inappropriate Offered By

Basile Van Hoorick

Developer

Email bvh@outlook.be

PO Box 7
9080 Lochristi
Belgium