# Calculator vs Lotto Engine 2D

The clearest difference is price: Lotto Engine 2D at Free against Calculator's $1.99. Lotto Engine 2D also leads on rating (4.6 vs 4.0) and review sentiment (100% vs 60%). Calculator's advantage is in-app purchases (none vs 1). On ads and device support there is nothing between them.

Lotto Engine 2D is free to download; Calculator costs $1.99 up front. Lotto Engine 2D sells 1 one-off in-app purchase. Calculator asks for nothing beyond the download.

Lotto Engine 2D holds the better App Store score, 4.6 against 4.0. That said, the two scores are not equally well evidenced: Lotto Engine 2D has 14 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 60% of Calculator's written reviews are positive against 100% of Lotto Engine 2D's.

Calculator ships an update every 11 months, Lotto Engine 2D every 5 weeks. The most recent releases landed on October 6, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Calculator | Lotto Engine 2D |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/calculator/id286319444/reviews) | **[4.6 (14 ratings)](https://appshunter.io/ios/app/lotto-engine-2d/id1638054406/reviews)** |
| Number of ratings | 1 | **14** |
| Positive reviews | 60.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 5 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 5 MB | 17 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Byte Works, Inc.](https://appshunter.io/developer/286319447) | [何均 邓](https://appshunter.io/developer/1621073530) |

## What reviewers say

### Calculator

[App page](https://appshunter.io/ios/app/calculator/id286319444)

This app offers a comprehensive scientific calculator with multiple modes, including algebraic, scientific, conversions, and logic calculations. It features a user-friendly design with large buttons and remembers your progress if interrupted.

**Highlights:** Algebraic entry, Scientific calculations, Unit conversions (length, area, volume, etc.), Logic calculator (binary, octal, decimal, hex), 10 memory registers, Wide number range support

**Features:** macOS Compatibility

**In-app purchases:** none


### Lotto Engine 2D

[App page](https://appshunter.io/ios/app/lotto-engine-2d/id1638054406)

This app generates random numbers using a physics-based simulation of balls in a container. Personalize your experience by selecting favorite numbers and enjoy a fun, easy-to-use random number picker.

**Highlights:** Physics-based 2D/3D ball simulation, Random number generation, Customizable settings, Favorite number selection, Easy to use interface

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Features | $1.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 👍 Very good software
- 👍 Reliable and durable
- 👍 Conscientious and careful maintenance
- 👍 No advertising


## Frequently asked questions

### Is Calculator free?

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

### Is Lotto Engine 2D free?

Lotto Engine 2D is free to download, with in-app purchases available.

### Which has better reviews, Calculator or Lotto Engine 2D?

Lotto Engine 2D is rated higher. Calculator averages 4.0 out of 5 from 1 ratings, while Lotto Engine 2D averages 4.6 from 14 ratings.

### Do Calculator or Lotto Engine 2D have ads?

Neither Calculator nor Lotto Engine 2D shows ads.

### Which is updated more often, Calculator or Lotto Engine 2D?

Calculator ships an update every 11 months, and Lotto Engine 2D every 5 weeks. Most recently, Calculator was updated on October 6, 2026 and Lotto Engine 2D on October 2, 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.*