# RBM Smart vs SIGMA BG

The clearest difference is update cadence: RBM Smart at every 2 months against SIGMA BG's every 11 months. SIGMA BG's advantage is iOS requirement (11.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

RBM Smart ships an update every 2 months, SIGMA BG every 11 months. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | RBM Smart | SIGMA BG |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 11 months |
| Size | 39 MB | 26 MB |
| Requires iOS | 15.1 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [R.B.M. SPA](https://appshunter.io/developer/1500244689) | [ID&A S.r.l.](https://appshunter.io/developer/1446283055) |

## What reviewers say

### RBM Smart

[App page](https://appshunter.io/ios/app/rbm-smart/id6459881266)

**In-app purchases:** none


### SIGMA BG

[App page](https://appshunter.io/ios/app/sigma-bg/id6752767809)

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

**In-app purchases:** none


## Frequently asked questions

### Is RBM Smart free?

RBM Smart is free to download, with no in-app purchases.

### Is SIGMA BG free?

SIGMA BG is free to download, with no in-app purchases.

### Do RBM Smart or SIGMA BG have ads?

Neither RBM Smart nor SIGMA BG shows ads.

### Which is updated more often, RBM Smart or SIGMA BG?

RBM Smart ships an update every 2 months, and SIGMA BG every 11 months. Most recently, RBM Smart was updated on October 27, 2026 and SIGMA BG on October 25, 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.*