# ClevCalc vs SimpleSigma

The clearest difference is review sentiment: ClevCalc at 91% against SimpleSigma's 67%. ClevCalc also leads on iOS requirement (15.0 vs 26.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. ClevCalc sells 3 in-app purchases, starting at $2.99 per month and SimpleSigma sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ClevCalc ships an update monthly, SimpleSigma every 6 weeks. The most recent releases landed on October 24, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | ClevCalc | SimpleSigma |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (14K ratings)](https://appshunter.io/ios/app/clevcalc-calculator/id1221235593/reviews)** | — |
| Number of ratings | **14K** | — |
| Positive reviews | **91.2% of reviews** | 66.7% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Monthly** | Every 6 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 117 MB | 7 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Cleveni Inc.](https://appshunter.io/developer/1221235592) | [MUTSUAKI KIKUCHI](https://appshunter.io/developer/1874283283) |

## What reviewers say

### ClevCalc

[App page](https://appshunter.io/ios/app/clevcalc-calculator/id1221235593)

This comprehensive calculator app offers a wide range of tools for everyday calculations, from basic arithmetic and scientific functions to unit and currency conversions. It includes specialized calculators for loans, health, fuel costs, GPA, and more, all within a clean and user-friendly interface.

**Highlights:** Scientific calculator, Unit converter, Currency converter, Loan calculator, Health calculator (BMI, BMR), Date calculator, GPA calculator

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Subscription | $2.99 | per month |
| Premium Subscription | $24.99 | per year |
| Premium version | $13.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 🚀 Efficient calculations
- 💡 Versatile features (currency, unit conversions, etc.)
- 👍 Intuitive interface
- 👍 Helpful for daily tasks

**What reviewers complain about**

- 💰 Subscription model too expensive
- 🔍 Ads can be intrusive
- 🐛 Occasional UI issues (e.g. ads blocking functionality)
- 🔍 Lack of advanced features (e.g. RPN mode, binary calculator)

**Reported bugs**

- Keystrokes not always registering
- Compatibility issues with older devices

**Requested features**

- Dark mode option
- Ability to save/recall calculations
- More customization options
- Integration with other apps/platforms


### SimpleSigma

[App page](https://appshunter.io/ios/app/simplesigma/id1522264347)

This app offers a versatile calculator with three distinct table types for various needs, from simple sums to complex quantity-based calculations. It features intuitive input, auto-saving, and CSV export. An optional Pro version removes ads, unlocks unlimited tables, and adds advanced statistics and OCR receipt scanning.

**Highlights:** Three distinct table types (Simple, Duplex, Shopping), Auto-totaling and quick sum calculations, Swipe keyboard for cell navigation, CSV data export, Auto-save functionality, Optional Pro version with advanced features

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SimpleSigma Pro (Monthly) | $2.99 | per month |
| SimpleSigma Pro (Yearly) | $29.99 | per year |


## Frequently asked questions

### Is ClevCalc free?

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

### Is SimpleSigma free?

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

### Do ClevCalc or SimpleSigma have ads?

Both ClevCalc and SimpleSigma show ads.

### Which is updated more often, ClevCalc or SimpleSigma?

ClevCalc ships an update monthly, and SimpleSigma every 6 weeks. Most recently, ClevCalc was updated on October 24, 2026 and SimpleSigma on October 7, 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.*