# RTA Pro vs DIY SMART KEY

The clearest difference is review sentiment: RTA Pro at 50% against DIY SMART KEY's 0%. RTA Pro also leads on chart position (#191 vs unranked). DIY SMART KEY's advantage is price (Free vs $5.99) and update cadence (monthly vs every 3 months). On ads, in-app purchases and device support there is nothing between them.

DIY SMART KEY is free to download; RTA Pro costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

RTA Pro ships an update every 3 months, DIY SMART KEY monthly. The most recent releases landed on October 8, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | RTA Pro | DIY SMART KEY |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/rta-pro/id703753970/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | **50.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Paid | **Free** |
| Best chart rank | **#191** | — |
| Size | 12 MB | 19 MB |
| Requires iOS | 17.6 | **7.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Matthias Schorer](https://appshunter.io/developer/290579382) | [师松 梁](https://appshunter.io/developer/922518056) |

## What reviewers say

### RTA Pro

[App page](https://appshunter.io/ios/app/rta-pro/id703753970)

**Currently charting:** #191 Top Paid · Utilities (US App Store)

Transform your iOS device into a professional audio analysis tool. Analyze ambient noise frequencies, pinpoint room resonance, and set up sound systems for events. Features include custom calibration, multiple display modes, and adjustable speed settings.

**Highlights:** Real-time audio spectrum analysis, Frequency range 32Hz to 16kHz, Linear, dB(A), and dB(C) weightings, 1/3 Octave Bands, Octave Bands, and FFT display, Adjustable speed settings, Custom calibration options

**In-app purchases:** none


### DIY SMART KEY

[App page](https://appshunter.io/ios/app/diy-smart-key/id1159590077)

Transform your traditional remote control systems into smartphone-controlled ones. This app allows you to manage car alarms, motorcycle alarms, home security, and door automation systems directly from your phone via a Bluetooth module.

**Highlights:** Smartphone control for alarms and door automation, Supports automotive, motorcycle, and home systems, Automatic locking/unlocking based on proximity, Compatible with various fixed and learning code systems, Bluetooth pairing with I-KEY module, Code learning from original remotes

**In-app purchases:** none


## Frequently asked questions

### Is RTA Pro free?

RTA Pro costs $5.99, with no in-app purchases.

### Is DIY SMART KEY free?

DIY SMART KEY is free to download, with no in-app purchases.

### Do RTA Pro or DIY SMART KEY have ads?

Neither RTA Pro nor DIY SMART KEY shows ads.

### Which is updated more often, RTA Pro or DIY SMART KEY?

RTA Pro ships an update every 3 months, and DIY SMART KEY monthly. Most recently, RTA Pro was updated on October 8, 2026 and DIY SMART KEY on October 15, 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.*