# Simple Calculator. vs InboxGuard

The clearest difference is price: Simple Calculator. at Free against InboxGuard's $0.99. Simple Calculator. also leads on iOS requirement (15.6 vs 17.6). InboxGuard's advantage is ads (none vs shown) and update cadence (monthly vs every 3 months). On in-app purchases and device support there is nothing between them.

Simple Calculator. is free to download; InboxGuard costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Simple Calculator. ships an update every 3 months, InboxGuard monthly. The most recent releases landed on October 18, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Simple Calculator. | InboxGuard |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.6 (1.6K ratings)](https://appshunter.io/ios/app/simple-calculator/id1324926551/reviews)** | — |
| Number of ratings | **1.6K** | — |
| Positive reviews | 65.1% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Ad-supported | — |
| Size | 5 MB | 4 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [tasser gyati](https://appshunter.io/developer/1324926550) | [Shashwat Patel](https://appshunter.io/developer/1873309489) |

## What reviewers say

### Simple Calculator.

[App page](https://appshunter.io/ios/app/simple-calculator/id1324926551)

A straightforward calculator designed for speed and accuracy, mimicking classic pocket calculators. It offers real-world logic, business-focused calculations like cost, sell, and margin, and a clean interface for effortless use.

**Highlights:** Real-world logic, no forced order of operations, Running total display, Cost, sell, margin calculations, Add/subtract percentages in one step, Clean, intuitive interface with large buttons, Minimal, non-intrusive ads

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

**In-app purchases:** none

**What reviewers like**

- 👍 Simple and easy to use
- 💡 Supports percentage calculations
- 🚀 Fast and responsive
- 🔒 No security issues reported

**What reviewers complain about**

- 🐛 Occasional display issues with underline artifacts
- 📢 Intrusive ads in free version
- 💰 Paid version not clearly advertised

**Reported bugs**

- Incorrect calculation results in some cases
- Ads appearing during critical usage scenarios

**Requested features**

- Add a dedicated 'C' clear button
- Provide more customization options for key layout
- Implement a history/memory function


### InboxGuard

[App page](https://appshunter.io/ios/app/inboxguard/id6762069042)

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

**In-app purchases:** none


## Frequently asked questions

### Is Simple Calculator. free?

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

### Is InboxGuard free?

InboxGuard costs $0.99, with no in-app purchases.

### Do Simple Calculator. or InboxGuard have ads?

Simple Calculator. shows ads; InboxGuard does not.

### Which is updated more often, Simple Calculator. or InboxGuard?

Simple Calculator. ships an update every 3 months, and InboxGuard monthly. Most recently, Simple Calculator. was updated on October 18, 2026 and InboxGuard 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.*