# DR.Lissajous vs 555 Timer & Oscillators Guide

The clearest difference is update cadence: 555 Timer & Oscillators Guide at every 4 months against DR.Lissajous's every 23 months. DR.Lissajous's advantage is iOS requirement (9.1 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

DR.Lissajous ships an update every 23 months, 555 Timer & Oscillators Guide every 4 months. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | DR.Lissajous | 555 Timer & Oscillators Guide |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/drlissajous/id713543974/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 23 months | **Every 4 months** |
| Monetization | Free | — |
| Size | 41 MB | 20 MB |
| Requires iOS | **9.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Daniel Roth](https://appshunter.io/developer/356650850) | [ALG Software Lab](https://appshunter.io/developer/1650561236) |

## What reviewers say

### DR.Lissajous

[App page](https://appshunter.io/ios/app/drlissajous/id713543974)

Explore the visual patterns created by combining horizontal and vertical electron beam movements. Manipulate amplitudes, frequencies, and phase differences to generate unique spirograph-like curves on your screen.

**Highlights:** Create Lissajous curves, Simulate electron beam motion, Adjust amplitudes, Modify frequencies, Change phase difference, Generate spirograph patterns

**Features:** macOS Compatibility

**In-app purchases:** none


### 555 Timer & Oscillators Guide

[App page](https://appshunter.io/ios/app/555-timer-and-oscillators-guide/id6504487994)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is DR.Lissajous free?

DR.Lissajous is free to download, with no in-app purchases.

### Is 555 Timer & Oscillators Guide free?

555 Timer & Oscillators Guide is free to download, with no in-app purchases.

### Do DR.Lissajous or 555 Timer & Oscillators Guide have ads?

Neither DR.Lissajous nor 555 Timer & Oscillators Guide shows ads.

### Which is updated more often, DR.Lissajous or 555 Timer & Oscillators Guide?

DR.Lissajous ships an update every 23 months, and 555 Timer & Oscillators Guide every 4 months. Most recently, DR.Lissajous was updated on November 1, 2026 and 555 Timer & Oscillators Guide on November 6, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*