# Solves vs CalcFlex

The clearest difference is update cadence: CalcFlex at every 9 days against Solves's every 3 weeks. Solves's advantage is device support (5 vs 1) and iOS requirement (15 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Solves sells 6 one-off in-app purchases and CalcFlex sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Solves ships an update every 3 weeks, CalcFlex every 9 days. The most recent releases landed on October 15, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Solves | CalcFlex |
| --- | --- | --- |
| 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 | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 9 days** |
| Monetization | Free with in-app purchases | — |
| Size | 82 MB | 2 MB |
| Requires iOS | **15** | 17.0 |
| Devices | **iPhone, iPad, iPod, Mac, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Oleg Barinov](https://appshunter.io/developer/1394359547) | [Daniel Chiu Loong Ng](https://appshunter.io/developer/1755978644) |

## 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


### CalcFlex

[App page](https://appshunter.io/ios/app/calcflex-calculator/id6520389768)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| +3 New Variables | $1.99 | one-time |
| +20 New Equation Slots | $1.99 | one-time |
| +1 New Calculator | $3.99 | one-time |


## Frequently asked questions

### Is Solves free?

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

### Is CalcFlex free?

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

### Do Solves or CalcFlex have ads?

Neither Solves nor CalcFlex shows ads.

### Which is updated more often, Solves or CalcFlex?

Solves ships an update every 3 weeks, and CalcFlex every 9 days. Most recently, Solves was updated on October 15, 2026 and CalcFlex on October 6, 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.*