Comparison

Harmonic Wave Equation Calc vs KQ MIDI Modulate

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

Head to head
About

Harmonic Wave Equation Calc

This physics and math calculator quickly determines wave properties like displacement, velocity, and amplitude. It provides instant calculations with copyable results and includes reference formulas. Optimized for everyday use, it supports high precision and various units.

Highlights
  • Instant wave calculations
  • Copyable results
  • Included reference formulas
  • Supports 16 decimal places
  • Multiple unit support
  • Ad-free and private
Features
Read full description

Harmonic Wave Equation Calculator is a physics/math calculator used to find the displacement of a given point along the wave, the position of that point, the time point, wave velocity, wavelength, amplitude, or initial phase of the wave quickly and easily. Features: - Instant calculation. - Results are copyable to other apps. - Formulas are included as references. - Supports up to 16 decimal places. - Supports various units for each input. - Works seamlessly on both iPhone and iPad. - Lightweight, compact app optimized for everyday use. - Ad-free and built with privacy in mind. A harmonic of such a wave is a wave with a frequency that is a positive integer multiple of the frequency of the original wave, known as the fundamental frequency. The original wave is also called the 1st harmonic; the following harmonics are known as higher harmonics. Formula: y = A * sin[(2π / λ) * (x - vt) + Φ] where: y - displacement of a given point along the wave x - position of that point (its distance from the source) t - time point v - wave velocity λ - wavelength A - amplitude Φ - initial phase of the wave Thank you for your support, and feel free to visit nitrio.com for more apps for your iOS devices.

About

KQ MIDI Modulate

This tool is designed for advanced MIDI users to manipulate and route MIDI signals. It offers extensive control over signal conversion, note triggering, and pad-based MIDI output, including AUv3 plugins. It does not produce sound on its own.

Highlights
  • MIDI signal conversion
  • 8x16 pad output
  • Free MIDI device routing
  • AUv3 plugins included
  • Note and control signal triggering
  • Customizable signal filtering
Features
Read full description

This is a tool for MIDI experts. Not recommended for beginners. - This app by itself does not produce sound. - It converts input MIDI signals and outputs them. - You can use 8x16 pads to output any MIDI signal. - You can route MIDI devices freely. - This app includes 2 AUv3 Plugins. - Compatible only with MIDI 1.0; MIDI 2.0 is not supported. - The developer uses this app conveniently with a MIDI wind controller. Convert Converts the values of control signals. Cannot be set per channel. Note Ctrl, Threshold: Transmit note on messages only if the value of the Note Ctrl is above the threshold. Key: Key of the note signal Vel1: Velocity of Note On Vel0: Velocity of Note Off CC: Control Change AT: Channel Aftertouch PB: Pitch Bend PC: Program Change N/A: Not applicable HR: High Resolution - when enabled, handles 14-bit signals. E: Envelope, tap to open the settings window. F: Filter, tap to open the settings window. LPF: Low-pass filter, smoothes out value changes. The higher the Strength value, the slower the change. HPF: High-pass filter, applies only abrupt value changes. The value automatically approaches the Return Base value. The higher the Strength value, the faster the change. Tap the graph to switch between line graph, history, and bar graph. Long press the graph and tap “Edit Curve” to edit the curve. "- 0 +" denotes the offset; this value is added to the input value. Press the button in the top left corner to switch to a minimized view. The "!" in the top right corner is the panic button. Pressing it sends All Notes Off and All Sound Off messages. Trigger Sends signals according to the rules upon receiving specified MIDI signals. You can specify channels. Harmony: Shifted note signals Channel Rewrite: Rewrite of channels Signal Trigger: Trigger of any MIDI signal Value Offset: Increment/decrement of value Filter: Suppression of transmission Pad Consists of 8x16 pads. Note: Note signal CC/AT/PB Oneshot: Control signal (when pressed) CC/AT/PB On/Off: Control signal (press/release) Program: Patch Change (bank selectable) Convert Offset: Offset specification for the Convert screen Load Preset: File loading on the Profiles screen Misc/SysEx: Any signal Latch: Pads become toggles. If a group is specified, the pads act as radio buttons. Options Key Delay: Delays Note On Velocity Convert: When outputting Vel1 in Convert, select whether to always convert or only when legato is not present MIDI Rx Channel: Receiving channel MIDI Tx Channel: Transmitting channel Filter Other Channel: Suppress transmission of channels other than receiving channel Duplicated Notes: Specifies handling of duplicated notes Note that: The application and description contain machine-translated text.

Screenshots

Harmonic Wave Equation Calc4 screens
KQ MIDI Modulate4 screens

Verdict

The call

The clearest difference is update cadence: KQ MIDI Modulate at fortnightly against Harmonic Wave Equation Calc's every 31 months. KQ MIDI Modulate also leads on ratings volume (4 vs 1). Harmonic Wave Equation Calc's advantage is price ($2.99 vs $5.99) and iOS requirement (13 vs 15.0). On rating, ads, in-app purchases and monetization model 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

Harmonic Wave Equation Calc costs $2.99 and KQ MIDI Modulate $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Harmonic Wave Equation Calc against 5.0 for KQ MIDI Modulate. Both are backed by a comparable volume of ratings — 1 and 4 respectively.

UpkeepUpdate frequency

Harmonic Wave Equation Calc ships an update every 31 months, KQ MIDI Modulate fortnightly. The most recent releases landed on July 6, 2026 and September 19, 2026 respectively.

Scorecard4 real differences · 6 level
Harmonic Wave Equation Calc versus KQ MIDI Modulate: the parameters behind the verdict, then further details
ParameterHarmonic Wave Equation CalcKQ MIDI Modulate
Price$2.99 — better$5.99
Rating5.0 (1 ratings)5.0 (4 ratings)
Positive reviews—66.7% of reviews
Number of ratings14 — better
Update frequencyEvery 31 monthsFortnightly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13 — better15.0
Further details — not scored
Size1 MB2 MB
Age rating4+4+
DeveloperTan Chia LingRyouta Kira

Customer experience

Harmonic Wave Equation Calc

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

KQ MIDI Modulate

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive66.7%
Neutral33.3%
Negative0.0%

In-app purchases

None

Harmonic Wave Equation Calc

No in-app purchases

None

KQ MIDI Modulate

No in-app purchases

Questions

Is Harmonic Wave Equation Calc free?
Harmonic Wave Equation Calc costs $2.99, with no in-app purchases.
Is KQ MIDI Modulate free?
KQ MIDI Modulate costs $5.99, with no in-app purchases.
Which has better reviews, Harmonic Wave Equation Calc or KQ MIDI Modulate?
Harmonic Wave Equation Calc and KQ MIDI Modulate are both rated 5.0 out of 5 on the App Store, from 1 and 4 ratings respectively.
Do Harmonic Wave Equation Calc or KQ MIDI Modulate have ads?
Neither Harmonic Wave Equation Calc nor KQ MIDI Modulate shows ads.
Which is updated more often, Harmonic Wave Equation Calc or KQ MIDI Modulate?
Harmonic Wave Equation Calc ships an update every 31 months, and KQ MIDI Modulate fortnightly. Most recently, Harmonic Wave Equation Calc was updated on July 6, 2026 and KQ MIDI Modulate on September 19, 2026.

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