# Fourier Series Visualiser vs DLang

The clearest difference is in-app purchases: Fourier Series Visualiser at none against DLang's 1. DLang's advantage is update cadence (every 4 days vs every 11 months) and iOS requirement (13.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. DLang sells 1 in-app purchase, starting at $34.99 per year. Fourier Series Visualiser asks for nothing beyond the download.

Fourier Series Visualiser ships an update every 11 months, DLang every 4 days. The most recent releases landed on October 2, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Fourier Series Visualiser | DLang |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (4 ratings)](https://appshunter.io/ios/app/fourier-series-visualiser/id1582827502/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 4 days** |
| Monetization | Free | — |
| Size | 2 MB | 49 MB |
| Requires iOS | 26.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Jack Finnis](https://appshunter.io/developer/1633101066) | [Vladimir Ivanov](https://appshunter.io/developer/1818827891) |

## What reviewers say

### Fourier Series Visualiser

[App page](https://appshunter.io/ios/app/fourier-series-visualiser/id1582827502)

Create intricate epicycle drawings by tracing any shape with your finger. This free app visualizes the mathematical principles behind Fourier series, allowing you to adjust coefficients for different approximations and import SVG files for unique artwork. It's perfect for students, teachers, and math enthusiasts.

**Highlights:** Draw custom shapes for epicycle generation, Adjust Fourier coefficients for approximation levels, Import SVG files for artwork transformation, Visualize complex Fourier series analysis, Share drawings with friends

**Features:** macOS Compatibility

**In-app purchases:** none


### DLang

[App page](https://appshunter.io/ios/app/dlang/id6746865107)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Yearly subscription | $34.99 | per year |


## Frequently asked questions

### Is Fourier Series Visualiser free?

Fourier Series Visualiser is free to download, with no in-app purchases.

### Is DLang free?

DLang is free to download, with in-app purchases available.

### Do Fourier Series Visualiser or DLang have ads?

Neither Fourier Series Visualiser nor DLang shows ads.

### Which is updated more often, Fourier Series Visualiser or DLang?

Fourier Series Visualiser ships an update every 11 months, and DLang every 4 days. Most recently, Fourier Series Visualiser was updated on October 2, 2026 and DLang on October 10, 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.*