# SDカード R&W vs SimpleSigma

The clearest difference is review sentiment: SimpleSigma at 67% against SDカード R&W's 6%. SimpleSigma also leads on update cadence (every 6 weeks vs every 8 months). SDカード R&W's advantage is in-app purchases (none vs 2) and ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. SimpleSigma sells 2 in-app purchases, starting at $2.99 per month. SDカード R&W asks for nothing beyond the download.

SDカード R&W ships an update every 8 months, SimpleSigma every 6 weeks. The most recent releases landed on October 24, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | SDカード R&W | SimpleSigma |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 5.6% of reviews | **66.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 8 months | **Every 6 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 17 MB | 7 MB |
| Requires iOS | **8.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Panasonic Holdings Corporation](https://appshunter.io/developer/386916344) | [MUTSUAKI KIKUCHI](https://appshunter.io/developer/1874283283) |

## What reviewers say

### SDカード R&W

[App page](https://appshunter.io/ios/app/sd-r-and-w/id941508150)

Wirelessly back up photos, videos, and contacts from your iPhone or iPad. Browse and play media and documents stored on an SD card. Requires a separate wireless SD card reader and memory card.

**Highlights:** Wireless backup of iPhone/iPad photos, videos, and contacts, Browse and play SD card media (photos, videos, music), View documents (Word, Excel, PDF), Compact and portable design, Supports iOS 8.0-13

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

**In-app purchases:** none


### 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 SDカード R&W free?

SDカード R&W is free to download, with no in-app purchases.

### Is SimpleSigma free?

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

### Do SDカード R&W or SimpleSigma have ads?

SimpleSigma shows ads; SDカード R&W does not.

### Which is updated more often, SDカード R&W or SimpleSigma?

SDカード R&W ships an update every 8 months, and SimpleSigma every 6 weeks. Most recently, SDカード R&W 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.*