# Solves vs SIGMA RAP

The clearest difference is in-app purchases: SIGMA RAP at none against Solves's 6. SIGMA RAP also leads on iOS requirement (11.0 vs 15). Solves's advantage is device support (5 vs 3). On price and ads there is nothing between them.

Both are free to download. Solves sells 6 one-off in-app purchases. SIGMA RAP asks for nothing beyond the download.

## The numbers

| Metric | Solves | SIGMA RAP |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (382 ratings)](https://appshunter.io/ios/app/solves-calculator-for-all/id1394359548/reviews)** | — |
| Number of ratings | **382** | — |
| Positive reviews | 90.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | — |
| Monetization | Free with in-app purchases | — |
| Size | 82 MB | 24 MB |
| Requires iOS | 15 | **11.0** |
| Devices | **iPhone, iPad, iPod, Mac, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Oleg Barinov](https://appshunter.io/developer/1394359547) | [ID&A S.r.l.](https://appshunter.io/developer/1446283055) |

## What reviewers say

### Solves

[App page](https://appshunter.io/ios/app/solves-calculator-for-all/id1394359548)

A powerful and versatile calculator for all your Apple devices. Edit complex expressions, sync history across devices, and enjoy a clean, ad-free experience. Unlock advanced features like unit conversion and fraction support with an optional upgrade.

**Highlights:** Edit expressions without limitations, Instant results, Sync calculation history across devices, Unit conversion (currencies, physical units), Fraction support, Customizable themes

**Features:** Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tip Option #1 | $0.99 | one-time |
| Tip Option #2 | $1.99 | one-time |
| Tip Option #3 | $4.99 | one-time |
| Tip Option #4 | $9.99 | one-time |
| Solves+ | $9.99 | one-time |
| Tip Option #5 | $19.99 | one-time |

**What reviewers like**

- 👍 Excellent calculator app
- 🚀 Smooth and responsive
- 🔒 No ads or data collection
- 💡 Useful features like history, comments, and unit conversions
- 👍 Clean and intuitive design

**What reviewers complain about**

- 🐛 Occasional crashes or bugs after updates
- 🐛 Issues with certain mathematical operations
- 🐛 Family sharing not working properly
- 🐛 Lag or performance issues on some devices
- 💡 Desire for more advanced features like fractions, base conversions

**Reported bugs**

- Crashes when pressing certain buttons
- Issues with parsing complex expressions
- Incorrect results for some calculations
- Problems with history clearing or syncing

**Requested features**

- Add support for fractions and mixed numbers
- Implement a widget for quick access
- Allow resizing the app window on Mac
- Provide more customization options
- Add support for Apple Watch


### SIGMA RAP

[App page](https://appshunter.io/ios/app/sigma-rap/id6744170583)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Solves free?

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

### Is SIGMA RAP free?

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

### Do Solves or SIGMA RAP have ads?

Neither Solves nor SIGMA RAP shows ads.

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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.*