1 » Description2 » Features

Initial version: 1.00


Algernon is an associatively parametric 2D geometry calculator and design tool.

Points, lines, and circles can be constructed with relationships between them and in terms of variables and mathematical formulae. If any one element or variable changes, the geometry is automatically recalculated.

The geometry can be interrogated, dimensioned, inked, annotated with text, and printed (via AirPrint or e-mail export of PDF).

Aimed primarily at engineers and mathematicians (both practising and studying) it is ideally suited for computing geometrical constructions, designing or checking mechanical details, architectural layouts, etc.

Algernon does not need lots of drawing tools; it just needs one for each kind of element. It can automatically determine what kind of construction to create based upon where the user taps. This keeps the user interface clean, simple, and consistent, without restricting its sophistication. It may seem strange at first to those used to conventional CAD, but we believe it will be found natural after a short time.

The app incorporates help and reference documentation, sample model files, and introductory video demonstration.

The app contains in-built help and reference documentation, sample files, and an explanatory video tour.


For pre-sale enquiries and post-purchase support for this product, please contact us by e-mail.

  • Point, line, and circle construction elements.
  • Constructions of intersections, bisections, and tangents.
    • Can solve circle tangential to 3 others.
  • Mathematical formulae can be specified as parameters (e.g. position, radius, etc.).
  • Variables can be created.
    • Geometrical elements can be used within formulae.
  • Constructed geometry can be dimensioned:
    • Linear, including projections.
    • Circle radius and diameter.
    • Angles (radians and degrees).
    • Arc-lengths.
    • Internal and external layout.
  • Ink can be drawn over constructed geometry, for printing/PDF.
  • Annotation text can be added.
  • Drawing styles can be created, giving control of:
    • Construction line colour.
    • Ink pen width and colour.
    • Ink dash style.
    • Text font and size.
    • Dimensioning units.
  • Save, print, and e-mail drawings.

Mobile Apps

Mobile apps homepage



Structural analysis

CASA app homepage

CASA Space Frame 3D

CASA Space Truss 3D

CASA Space Frame L

CASA Space Truss L

CASA Space Frame S


CASA Plane Frame 2D

CASA Plane Truss 2D

CASA Plane Grid 2D

CASA Multi - Beam 2D


See also

Selector Guide


CASA Intuition





1.00Initial release

Please visit the App Store for updates.

We recommend all users to keep up to date with their software, especially with regard to bug-fix releases.

Models should be saved prior to updating the App as unsaved data may not be preserved by the updating process.