Comparison

HSA vs HARMONY DSP

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

Head to head
About

HSA

Features
Read full description

After connecting App to Car Amplifier with Integrated DSP, EQ, BASS, TIME ALIGNMENT, PHASE, MUTE, FILTER , SAVE SOUND SETTING TO PHONE, SAVE SOUND SETTING TO AMPLIFIER, LOAD SOUND SETTING FROM PHONE, RCA OUTPUT etc could be controlled through this App. How to use: 1.Install App and turn on power of car 2. Turn on Bluetooth on your iPhone 3,Open App and wait for around 5 seconds, then click β€œConnect” icon in left corner of bottom. Amplifier will be connected to App automatically. 4.DIY you preferred sound and then click β€œSave to AMP” icon to save. Or click β€œ Save to Phone” to save. Note: 1.Do not exit app during saving and do not turn off power supply, program may be shut down caused by this.

About

HARMONY DSP

Features
Read full description

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 EQ’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.

Screenshots

HSA3 screens
HARMONY DSP4 screens

Verdict

The call

The clearest difference is update cadence: HSA at every 3 weeks against HARMONY DSP's every 19 months. On price, ads, in-app purchases and device support there is nothing between them.

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

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

UpkeepUpdate frequency

HSA ships an update every 3 weeks, HARMONY DSP every 19 months. The most recent releases landed on September 20, 2026 and May 16, 2026 respectively.

Scorecard1 real difference Β· 5 level
HSA versus HARMONY DSP: the parameters behind the verdict, then further details
ParameterHSAHARMONY DSP
PriceFreeFree
Update frequencyEvery 3 weeks β€” betterEvery 19 months
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPod β€” betteriPhone, iPod
Requires iOS12.011.0 β€” better
Further details β€” not scored
Size5 MB3 MB
Age rating4+4+
Developerζη”Ÿ 卒APEX Italy

In-app purchases

None

HSA

No in-app purchases

None

HARMONY DSP

No in-app purchases

Questions

Is HSA free?
HSA is free to download, with no in-app purchases.
Is HARMONY DSP free?
HARMONY DSP is free to download, with no in-app purchases.
Do HSA or HARMONY DSP have ads?
Neither HSA nor HARMONY DSP shows ads.
Which is updated more often, HSA or HARMONY DSP?
HSA ships an update every 3 weeks, and HARMONY DSP every 19 months. Most recently, HSA was updated on September 20, 2026 and HARMONY DSP on May 16, 2026.

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