# Solves vs Only One Calculator

The clearest difference is in-app purchases: Only One Calculator at none against Solves's 6. Only One Calculator also leads on update cadence (every 2 weeks vs every 3 weeks) and review sentiment (100% vs 91%). Solves's advantage is ratings volume (381 vs 2) and device support (5 vs 2). On price, rating and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.9 for Solves against 5.0 for Only One Calculator. That said, the two scores are not equally well evidenced: Solves has 381 ratings behind it against 2, so its average is the more settled of the two. Written reviews are what separate them: 91% of Solves's written reviews are positive against 100% of Only One Calculator's.

Solves ships an update every 3 weeks, Only One Calculator every 2 weeks. The most recent releases landed on September 19, 2026 and June 3, 2026 respectively.

## The numbers

| Metric | Solves | Only One Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (381 ratings)](https://appshunter.io/ios/app/solves-calculator-for-all/id1394359548/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/only-one-calculator/id1488596497/reviews)** |
| Number of ratings | **381** | 2 |
| Positive reviews | 90.6% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 82 MB | 34 MB |
| Requires iOS | 15 | **11.0** |
| Devices | **iPhone, iPad, iPod, Mac, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Oleg Barinov](https://appshunter.io/developer/1394359547) | [Jia Hua Huang](https://appshunter.io/developer/1488596496) |

## 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


### Only One Calculator

[App page](https://appshunter.io/ios/app/only-one-calculator/id1488596497)

This utility app offers instant currency exchange and unit conversions, making it ideal for travel and shopping. It features undo/redo functionality for easy editing and supports over 160 currencies with customizable update frequencies.  Users can also access calculation history and customize the keyboard.

**Highlights:** Instant currency exchange, Unit conversion (length, weight, area, volume, temperature), Undo/Redo functionality, History of calculations, Customizable keyboard layout, Real-time calculation results

**In-app purchases:** none


## Frequently asked questions

### Is Solves free?

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

### Is Only One Calculator free?

Only One Calculator is free to download, with no in-app purchases.

### Which has better reviews, Solves or Only One Calculator?

Only One Calculator is rated higher. Solves averages 4.9 out of 5 from 381 ratings, while Only One Calculator averages 5.0 from 2 ratings.

### Do Solves or Only One Calculator have ads?

Neither Solves nor Only One Calculator shows ads.

### Which is updated more often, Solves or Only One Calculator?

Solves ships an update every 3 weeks, and Only One Calculator every 2 weeks. Most recently, Solves was updated on September 19, 2026 and Only One Calculator on June 3, 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.*