SpiroDesigner vs HoroClock
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…
HoroClock
This app displays the real-time positions of planets and stars on a clock face, blending astronomy and astrology. It features a dynamic starfield, accurate astrological calculations, and a customizable local sky view.
- Real-time planetary positions
- Dynamic starfield with spectral colors
- Tropical and Sidereal zodiac options
- Multiple house systems
- Local sky calculations (Ascendant, Midheaven)
- Customizable planet and star display
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HoroClock turns the real-time positions of the planets into a beautiful clock face — astronomy and astrology, alive on your screen. The hour and minute hands tell the time. Around them, the Sun, Moon, Mercury, Venus, Mars, Jupiter, and Saturn orbit at their true ecliptic longitudes, calculated from astronomical algorithms. LIVING STARFIELD Over 1,600 stars from the HYG Star Database glow in their actual spectral colors. Bright stars shimmer with a halo effect that intensifies after dark. The sky tint shifts in real time with sunrise and sunset at your location. During meteor-shower seasons, shooting stars streak from the correct radiant point. SERIOUS ASTROLOGY TOOLS • Tropical and Sidereal zodiac (Lahiri, Babylonian Fixed, custom SVP) • 4 house systems: Whole Sign, Placidus, Equal, Regiomontanus • Ascendant, Midheaven, Part of Fortune, Lunar Nodes • Toggle Uranus, Neptune, and Pluto on or off • Fixed-star display on or off YOUR LOCAL SKY HoroClock calculates the Ascendant and Midheaven from your latitude and longitude, so the chart reflects the sky above you, right now. A CLOCK YOU ACTUALLY USE Leave it running and glance at it throughout the day — the planets drift slowly along the zodiac, the sky color shifts, and occasionally a shooting star crosses the dial. Double-tap to switch to a detailed list of all planetary positions. No ads. No subscription. One-time purchase.
Screenshots
Verdict
The clearest difference is update cadence: HoroClock at every 10 days against SpiroDesigner's every 5 months. HoroClock also leads on chart position (#195 vs unranked). On price, review sentiment, ads and in-app purchases 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
SpiroDesigner costs $2.99 and HoroClock $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
SpiroDesigner ships an update every 5 months, HoroClock every 10 days. The most recent releases landed on September 10, 2026 and September 13, 2026 respectively.
| Parameter | SpiroDesigner | HoroClock |
|---|---|---|
| Price | $2.99 | $2.99 |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 1 — better | — |
| Update frequency | Every 5 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Best chart rank | — | #195 — better |
| Devices | iPad | iPhone, iPad — better |
| Requires iOS | 16.0 | 16.0 |
| Further details — not scored | ||
| Size | 19 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | Masahiko Fukuyama | charapla |
Customer experience
SpiroDesigner
HoroClock
In-app purchases
SpiroDesigner
No in-app purchases
HoroClock
No in-app purchases









