Comparison

HARMONY DSP vs Rainbow Plug&Play DSP

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

HARMONY DSP

Features
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The Harmony DSP App allows you to setup and tune your system with your smart phone or tablet. In the main screen you will find the Input Source menu where you can choose BT, HI-LEV, USB and AUX. Here you also find 8 Presets (saved into your device) to choose from, you access the Music Player, you have the Main and Subwoofer Volume, and the Advanced menu with Channels, EQ, System and Mixing. From the Channel Page, you can assign the function of each speaker, check the Phase for polarity, adjust the individual Channel Gains and set Delay in milliseconds or centimeters, for a rock solid and accurate front stage. The EQ page holds the heart and the brains of the App. You can use either the Graphic or the Paragraphic EQโ€™s. You can customize the crossovers to fit the needs of your individual system. You have adjustments for Gain, frequency, and Q factor. You can work on channels individually or you can link them. With the MIX function you can manually determine which inputs (USB-L/R, Digital-L/R, BT-L/R) will be used for each output (processing channel) and how much of each input the output will receive. The new Music Player function lets you have full control of all your favorite songs, inside the App. Be sure to connect a proper USB device containing audio files in the supported format (MP2/4, WMA, APE, FLAC, AAC, M4A,WAV, AIF, AIFC). From the App it is possible to access the folders and the contained audio files.

About

Rainbow Plug&Play DSP

This utility app allows users to operate and configure a specific audio device using Bluetooth Low Energy. It provides a direct connection for managing settings and functionality.

Highlights
  • Bluetooth LE operation
  • Audio device configuration
  • Direct connection
  • Settings management
Features
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Rainbow DSP Enables the operation and configuration of the Rainbow Audio Device via Bluetooth LE.

Screenshots

HARMONY DSP4 screens
Rainbow Plug&Play DSP1 screens

Verdict

The call

The clearest difference is update cadence: Rainbow Plug&Play DSP at every 2 months against HARMONY DSP's every 19 months. On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

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

UpkeepUpdate frequency

HARMONY DSP ships an update every 19 months, Rainbow Plug&Play DSP every 2 months. The most recent releases landed on October 27, 2026 and October 5, 2026 respectively.

Scorecard1 real difference ยท 7 level
HARMONY DSP versus Rainbow Plug&Play DSP: the parameters behind the verdict, then further details
ParameterHARMONY DSPRainbow Plug&Play DSP
PriceFreeFree
Positive reviewsโ€”100.0% of reviews
Update frequencyEvery 19 monthsEvery 2 months โ€” better
AdsNoNo
In-app purchasesNoNo
Monetizationโ€”Free
DevicesiPhone, iPodiPhone, iPod
Requires iOS11.0 โ€” better12.0
Further details โ€” not scored
Size3 MB26 MB
Age rating4+4+
DeveloperAPEX ItalyRainbow Audio GmbH

In-app purchases

None

HARMONY DSP

No in-app purchases

None

Rainbow Plug&Play DSP

No in-app purchases

Questions

Is HARMONY DSP free?
HARMONY DSP is free to download, with no in-app purchases.
Is Rainbow Plug&Play DSP free?
Rainbow Plug&Play DSP is free to download, with no in-app purchases.
Do HARMONY DSP or Rainbow Plug&Play DSP have ads?
Neither HARMONY DSP nor Rainbow Plug&Play DSP shows ads.
Which is updated more often, HARMONY DSP or Rainbow Plug&Play DSP?
HARMONY DSP ships an update every 19 months, and Rainbow Plug&Play DSP every 2 months. Most recently, HARMONY DSP was updated on October 27, 2026 and Rainbow Plug&Play DSP on October 5, 2026.

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