isosceles : geometry sketchpad 4+

Base 12 Innovations

Designed for iPad

    • 3.6 • 12 Ratings
    • Free
    • Offers In-App Purchases



Isosceles is the perfect geometry drawing tool for students, teachers, and professionals.

• The simple, versatile drawing tools (lines, circles, arcs, polygons, and conics) can be combined to create complex drawings.
• Isosceles automatically snaps new additions to nearby objects, keeping your drawing accurate so you can focus on the construction.
• Features like double/triple lines and point styles open up new uses for Isosceles, such as drawing chemical diagrams or graphs.
• Add text annotations and mathematical expressions anywhere in the drawing.
• Create smart text annotations that update their value based on the figures and calculations you type.
• Write or draw freeform on the canvas in addition to drawing geometric shapes.
• Insert images and graph functions directly in your sketches.
• Write or draw freeform on the canvas in addition to drawing geometric shapes.
• Switch between four distinct templates (Classical, Cartesian, Isometric, and Polar) to fit any kind of drawing.

• Connect your iPad to a TV or projector to present class material or demonstrate a construction.
• Put together homework assignments quickly by constructing diagrams with Isosceles.
• View and edit information about any object, such as the length of a line or the circumference of a circle.
• Add marks to show congruency and parallel objects, extend lines, show live measurements, and more.

• The handy notes sidebar accessible with a single tap makes taking notes in geometry effortless.
• Isosceles gives you access to 16 geometry activities and over 50 practice questions in 4 categories: Intro to Geometry, Lines, Circles, and Triangles.
• Solve construction problems and multiple choice questions after each tutorial to get the best preparation for geometry tests and the ACT/SAT.

• Isosceles's smart snapping system takes care of neatness, letting you focus on making your clients happy with great designs.
• The isometric grid snaps figures as you draw, making 3D schematics easy.
• Take advantage of the simple yet versatile export options for sharing sketches with colleagues.
• LaTeX users: Create your geometric figures in Isosceles and import them as TikZ code into your LaTeX documents. This allows you to take advantage of the seamless LaTeX rendering without the hassle of learning to write TikZ code.

• Isosceles automatically stores your sketches in iCloud so your documents are available across all your devices.
• Export to several file formats and destinations, including vector PDFs and AirPrint.
• Link your Dropbox or Box account to share your sketches to the cloud effortlessly!

In this free version you can access all drawing tools to create up to 2 sketches. Check out our Premium Features pack to take advantage of unlimited sketches, images and functions, iCloud sync, the Isometric and Polar geometry systems, and more great features. Or, buy Isosceles+ on the App Store, which includes all upgrades from this app.

Isosceles was designed and developed by a 17-year-old.

What’s New

Version 3.4

This app has been updated by Apple to display the Apple Watch app icon.

+Support for 3D touch, including home screen actions, Peek and Pop for sketches, and force-touch to select figures.
+Smart Measurements and Smart Calculations are now easier to create; simply start an annotation, then choose either feature in the keyboard toolbar.
+You can now crop your sketch before sharing it as a PDF or image.
+Change the scale of the Cartesian grid between normal units and units of pi.
+The Fill Region feature is now more robust and works with complex regions including conics, freehand annotations, and functions in addition to lines and circles.
-Bug fixes.

I hope you like Isosceles, and if you do please leave a review or rating on the App Store! I'll be heading off to MIT this fall, so I may not have as much time to work on my apps as I would like. But nevertheless, please reach out using the contact info in the app if there's anything you'd like to see added to Isosceles. I'd love to hear from you!

Base 12 Innovations

Ratings and Reviews

3.6 out of 5
12 Ratings

12 Ratings

Vegetable Dealer ,


I can’t seem to make an isosceles triangle, plz help

關山飛度 ,

Clashes when I try to close one sketch and create another

I need to delete this app then download again every time I close the sketch.

Tsonamy ,

Junk doesn’t not even let you write with a pen

This app is so bad! I do not recommend this for geometry. Bad, doesn’t even let you work with a pen.

App Privacy

The developer, Base 12 Innovations, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.

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