# Algernon

> Parametric 2D geometry calculator and CAD tool for engineers and mathematicians. (iPhone/iPad app by Intesym Ltd..)

- Source: https://appshunter.io/ios/app/algernon/id893557885 (this page in markdown: same URL + `.md`)
- Developer: [Intesym Ltd.](https://appshunter.io/developer/361434891)
- Category: Productivity, Education
- Price: $40.99
- Age rating: 4+
- Requires: iOS 12.1 · 2 MB
- Languages: American English
- Released: 2014-07-20
- Data updated: 2026-07-04
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/algernon/id893557885/reviews.md

## What is Algernon?

Algernon is an associatively parametric 2D geometry calculator and CAD 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.

Salient features:

* 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.
- Time can be used to create animations.

* 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:
- To calculate areas, centroids, and perimeters.
- 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, and export as PDF or DXF.

## Key features

- Parametric point, line, and circle construction
- Automatic geometry recalculation
- Dimensioning and annotation tools
- Variable creation and formula integration
- Export to PDF and DXF
- Customizable drawing styles

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/algernon/id893557885/reviews.md

### 4/5 — Unique and genius app

*2022-02-06*

Writing another review because the more I use this app the more genius I think it is. The interface takes a bit of getting used to but the associative parametric geometry is exactly what I was looking for and is brilliant. The price is higher than you possibly want to pay but worth supporting this guy for the very clever functionality.

## Frequently asked questions about Algernon

### What is Algernon?

Algernon is a 2D geometry calculator and CAD tool that allows users to construct geometric elements with parametric relationships. Changes to variables or elements automatically update the geometry.

### Who is Algernon designed for?

Algernon is primarily aimed at engineers and mathematicians, both practicing and studying. It is also suitable for designing or checking mechanical details and architectural layouts.

### What kind of geometric elements can be constructed in Algernon?

Algernon supports the construction of points, lines, and circles. It also includes constructions for intersections, bisections, and tangents, including solving for a circle tangential to three others.

### Can I use variables and formulas in Algernon?

Yes, mathematical formulas can be specified as parameters for elements like position and radius. You can also create variables, use geometrical elements within formulas, and even use time to create animations.

### What export options are available for drawings made in Algernon?

Drawings can be saved, printed, and emailed. They can also be exported in PDF format for sharing or printing, and as DXF files for compatibility with other CAD software.

### How does Algernon handle user interface complexity?

Algernon uses an associatively parametric approach with a simplified interface. It automatically determines construction types based on user input, keeping the UI clean while maintaining sophistication.

### Does Algernon have ads?

No, Algernon does not contain advertisements. It is a paid application with a one-time purchase price.

### What devices is Algernon compatible with?

Algernon is available for iPhone, iPad, and iPod touch devices, indicated by its age rating of 4+.

## Version history (last 5 releases)

### 22.02 — 2022-03-18

* Fixed bug when running on iOS15 whereby the formula entry field would expand to obscure buttons.

### 20.06 — 2020-06-17

* Fixed bug that limited access to iCloud files.

### 19.10 — 2019-11-04

* Now uses the standard iOS document browser. This makes import/export easier and allows documents to be arranged in folders.

* Due to the significant changes in file handling, we recommend backing up your documents before updating (e.g. via e-mail or iTunes).

### 18.02 — 2018-04-09

Improved compatibility with iOS 11 and iPhone X.

### 1.10 — 2016-11-21

* Updates relating to iOS 10. Fixes potential crash when exporting files.

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All apps by Intesym Ltd.: https://appshunter.io/developer/361434891

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-04.*