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Comparison

Harp Strings vs ZP 8.4 AMP MK II

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

Head to head
Harp Strings
Harp Strings
Free
🔧 Utilities
★ 5.01 ratingsView app →
ZP 8.4 AMP MK II
ZP 8.4 AMP MK II
Free
🔧 Utilities
No ratingsView app →
About

Harp Strings

Adjust audio output for optimal speaker and room acoustics. Offers advanced tone controls for fine-tuning, a mute switch, and the ability to edit amplifier names. Tailor your sound experience with precision.

Highlights
  • Tone controls for speaker and room matching
  • Advanced tone tuning
  • Mute switch
  • Amplifier name editor
Features
Read full description

This app provides tone controls to adjust the H1 for an optimum match with your speakers and the room.  It also provides advanced tone controls to further tune the H1. Other features include a mute switch and an amplifier name editor.

About

ZP 8.4 AMP MK II

Features
Read full description

This is a tuning software that connects to a DSP. You can select songs from the USB drive

Screenshots

Harp Strings2 screens
ZP 8.4 AMP MK II4 screens

Verdict

The call

The clearest difference is update cadence: ZP 8.4 AMP MK II at daily against Harp Strings's every 8 days. Harp Strings's advantage is iOS requirement (9.0 vs 14.0). On price, ads, in-app purchases and device support there is nothing between them.

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

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

Harp Strings ships an update every 8 days, ZP 8.4 AMP MK II daily. The most recent releases landed on October 21, 2026 and October 30, 2026 respectively.

Scorecard2 real differences · 7 level
Harp Strings versus ZP 8.4 AMP MK II: the parameters behind the verdict, then further details
ParameterHarp StringsZP 8.4 AMP MK II
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 8 daysDaily — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS9.0 — better14.0
Further details — not scored
Size34 MB2 MB
Age rating4+4+
DeveloperBitwise Systems IncMaslim Djanuanto

In-app purchases

None

Harp Strings

No in-app purchases

None

ZP 8.4 AMP MK II

No in-app purchases

Questions

Is Harp Strings free?
Harp Strings is free to download, with no in-app purchases.
Is ZP 8.4 AMP MK II free?
ZP 8.4 AMP MK II is free to download, with no in-app purchases.
Do Harp Strings or ZP 8.4 AMP MK II have ads?
Neither Harp Strings nor ZP 8.4 AMP MK II shows ads.
Which is updated more often, Harp Strings or ZP 8.4 AMP MK II?
Harp Strings ships an update every 8 days, and ZP 8.4 AMP MK II daily. Most recently, Harp Strings was updated on October 21, 2026 and ZP 8.4 AMP MK II on October 30, 2026.

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