# Polynomial vs RYURAKU

The clearest difference is price: RYURAKU at Free against Polynomial's $1.99. Polynomial's advantage is ads (none vs shown). On update cadence, in-app purchases, device support and iOS requirement there is nothing between them.

RYURAKU is free to download; Polynomial costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Polynomial ships an update monthly, RYURAKU every 3 weeks. The most recent releases landed on November 7, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | Polynomial | RYURAKU |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Every 3 weeks** |
| Size | 36 MB | 26 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Om Prakash Chapagain](https://appshunter.io/developer/1618620262) | [Fuji Bit Inc.](https://appshunter.io/developer/1874205957) |

## What reviewers say

### Polynomial

[App page](https://appshunter.io/ios/app/polynomial-solver-pro/id1619312553)

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

**In-app purchases:** none


### RYURAKU

[App page](https://appshunter.io/ios/app/ryuraku-fluid-dynamics/id6760613893)

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

**In-app purchases:** none


## Frequently asked questions

### Is Polynomial free?

Polynomial costs $1.99, with no in-app purchases.

### Is RYURAKU free?

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

### Do Polynomial or RYURAKU have ads?

RYURAKU shows ads; Polynomial does not.

### Which is updated more often, Polynomial or RYURAKU?

Polynomial ships an update monthly, and RYURAKU every 3 weeks. Most recently, Polynomial was updated on November 7, 2026 and RYURAKU on November 13, 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.*