# Simple Xwind vs Spark Number

The clearest difference is in-app purchases: Simple Xwind at none against Spark Number's 4. On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Spark Number sells 4 one-off in-app purchases. Simple Xwind asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Simple Xwind against 5.0 for Spark Number. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

## The numbers

| Metric | Simple Xwind | Spark Number |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/simple-xwind/id6741716196/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/spark-number/id6763991053/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 2 weeks |
| Monetization | **Free** | Free with in-app purchases |
| Size | 1 MB | 4 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alex Deutz](https://appshunter.io/developer/1795229168) | [Yellow Mountain Technology, Inc.](https://appshunter.io/developer/1113231522) |

## What reviewers say

### Simple Xwind

[App page](https://appshunter.io/ios/app/simple-xwind/id6741716196)

Quickly calculate crosswind and tailwind limits during flight. This app provides fast, precise calculations without clutter or unnecessary graphics, designed for immediate use when conditions change unexpectedly.

**Highlights:** Quick crosswind calculations, Precise tailwind limits, Fast and reliable, Simple, clutter-free interface, Designed for speed

**Features:** macOS Compatibility

**In-app purchases:** none


### Spark Number

[App page](https://appshunter.io/ios/app/spark-number/id6763991053)

Create personalized calculators for any task using simple text prompts. This app generates custom tools with native interfaces for mortgage calculations, recipes, discounts, and more, supporting advanced formulas and multiple languages.

**Highlights:** AI-powered calculator generation, Custom formula support, Native iOS interface, Multi-language prompt support, Plain text description input

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic Pack 15 credits | $0.99 | one-time |
| Unlock Unlimited Slots | $4.99 | one-time |
| Value Pack 50 credits | $4.99 | one-time |
| Master Pack 150 credits | $9.99 | one-time |


## Frequently asked questions

### Is Simple Xwind free?

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

### Is Spark Number free?

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

### Which has better reviews, Simple Xwind or Spark Number?

Simple Xwind and Spark Number are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do Simple Xwind or Spark Number have ads?

Neither Simple Xwind nor Spark Number shows ads.

---

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