SpiroDesigner vs Pi Generator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SpiroDesigner
Create intricate geometric patterns and mathematical curves with this digital spirograph tool. Customize circles, lines, and colors to design unique artwork. Features include saving, exporting, and automatic drawing modes.
- Draw epicycloids and hypotrochoids
- Customize circle radii and line thickness
- Select and edit colors
- Save and export drawings as PNG
- Automatic drawing mode
- Randomize settings
- Tutorial videos
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SpiroDesigner is an app which can draw a beautiful geometrical pattern like the classic toy, SpiroGraph . With this app, you will be able to easily design attractive and complicated works of art. SpiroDesigner is also a good tool to draw a cycloid curve or a trochoid curve which is known in the field of mathematics. Therefore, this app will help mathematical lovers, teachers and students to understand these mathematical figures. FEATURES: - Undo,Redo - Draw epicycloid,hypocycloid,epitrochoid,hypotrochoid - Select radius of circles, line thickness, position of the pen, scale - Select color - Edit curves(rotation, scale, color, line thickness,color) - Save drawing data - Save PNG images to camera roll - Load,Import - Export to iTunes - Automatic drawing mode - Function to randomize settings - Tutorial Videos and many more…
Pi Generator
This app generates a large number of pi digits, up to 100,000. It also offers a practice mode for learning pi. Test your device's capabilities with extensive pi calculations.
- Generates up to 10,000 digits of pi
- View up to 100,000 digits
- Practice learning pi
- Device performance testing
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A simple pi generator. Generates a maximum 10,000 digits of pi in the latest version! Would you like to see more? Can your phone handle Pi? If you'd like to see more digits just let me know. Either way you can still view up to 100,000. Practice learning Pi too!
Screenshots
Verdict
The clearest difference is price: Pi Generator at Free against SpiroDesigner's $2.99. Pi Generator also leads on update cadence (every 10 days vs every 5 months) and device support (3 vs 1). SpiroDesigner's advantage is in-app purchases (none vs 1). On rating, review sentiment, ratings volume and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Pi Generator is free to download; SpiroDesigner costs $2.99 up front. Pi Generator sells 1 one-off in-app purchase. SpiroDesigner asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for SpiroDesigner against 5.0 for Pi Generator. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
SpiroDesigner ships an update every 5 months, Pi Generator every 10 days. The most recent releases landed on September 10, 2026 and June 25, 2026 respectively.
| Parameter | SpiroDesigner | Pi Generator |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 5.0 (1 ratings) | 5.0 (2 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 1 | 2 — better |
| Update frequency | Every 5 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free — better |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 15.6 — better |
| Further details — not scored | ||
| Size | 19 MB | 35 MB |
| Age rating | 4+ | 4+ |
| Developer | Masahiko Fukuyama | Mark Duenas |
Customer experience
SpiroDesigner
Pi Generator
In-app purchases
SpiroDesigner
No in-app purchases
Pi Generator
- Remove ads$1.99
Questions
Is SpiroDesigner free?
Is Pi Generator free?
Which has better reviews, SpiroDesigner or Pi Generator?
Do SpiroDesigner or Pi Generator have ads?
Which is updated more often, SpiroDesigner or Pi Generator?
Other comparisons
