# THEOREM CONCEPTS vs Redback

The clearest difference is update cadence: Redback at every 2 weeks against THEOREM CONCEPTS's every 9 months. 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.

THEOREM CONCEPTS ships an update every 9 months, Redback every 2 weeks. The most recent releases landed on September 28, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | THEOREM CONCEPTS | Redback |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 43 MB | 58 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [THEOREM Pty Ltd](https://appshunter.io/developer/1280266469) | [Redback Technologies](https://appshunter.io/developer/1070020850) |

## What reviewers say

### THEOREM CONCEPTS

[App page](https://appshunter.io/ios/app/theorem-concepts/id1280266470)

This application functions as a remote control specifically for recliners. It allows users to operate their compatible recliner chairs directly from their iPhone or iPod.

**Highlights:** Recliner remote control, iPhone and iPod compatible, Dedicated recliner operation

**Features:** macOS Compatibility

**In-app purchases:** none


### Redback

[App page](https://appshunter.io/ios/app/redback/id6746735870)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is THEOREM CONCEPTS free?

THEOREM CONCEPTS is free to download, with no in-app purchases.

### Is Redback free?

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

### Do THEOREM CONCEPTS or Redback have ads?

Neither THEOREM CONCEPTS nor Redback shows ads.

### Which is updated more often, THEOREM CONCEPTS or Redback?

THEOREM CONCEPTS ships an update every 9 months, and Redback every 2 weeks. Most recently, THEOREM CONCEPTS was updated on September 28, 2026 and Redback on October 5, 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.*