Comparison

Harmonic Wave Equation Calc vs DigiDecoder

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

DigiDecoder

This application decodes and encodes various ham radio digital modes in real-time. It automatically recognizes signals, displays them with an animated waterfall, and supports sending SSTV images, CW, FT8, and Packet messages.

Highlights
  • Real-time digital mode decoding
  • Automatic signal recognition
  • Animated waterfall display
  • SSTV image encoding
  • CW, FT8, and Packet message encoding
  • Bluetooth and network TNC support
Read full description

DigiDecoder is a universal ham radio digital modes decoder and encoder. Use the built-in microphone or connect an audio cable directly for better input quality. One app for all the signals! The correct digital mode is automatically recognized and decoded in real time with an animated waterfall display. Quickly encode and send beautiful SSTV images, plus CW, FT8, and Packet messages. Bluetooth and network TNCs for Packet are supported as well. Try DigiDecoder free for 7 days. After the trial, continue with an affordable monthly subscription, or unlock lifetime access with a one-time purchase (a few months' worth). Nothing is charged during the trial and you can cancel anytime. Currently supported modes (more to come): SSTV: Robot 8 BW - 160×120 Robot 12 BW - 160×120 Robot 24 Color - 160×120 YCrCb Robot 24 BW - 320×240 Robot 36 - 320×240 YCrCb Robot 72 - 320×240 YCrCb Scottie S1 - 320×256 RGB Scottie S2 - 320×256 RGB Scottie DX - 320×256 RGB Martin M1 - 320×256 RGB Martin M2 - 320×256 RGB PD50 - 320×256 YCrCb PD90 - 320×256 YCrCb PD120 - 640×496 YCrCb PD180 - 640×496 YCrCb PD240 - 640×496 YCrCb PD160 - 512×400 YCrCb PD290 - 800×616 YCrCb Packet: AX.25 1200 - AFSK Bell 202, 1200/2200 Hz FX.25 1200 - AX.25 + Reed-Solomon FEC AX.25 300 - AFSK 1600/1800 Hz FX.25 300 - AX.25 300 + Reed-Solomon FEC IL2P 1200 AFSK - Bell 202 + RS FEC IL2P 300 AFSK - 1600/1800 Hz + RS FEC IL2P 300 BPSK - 1500 Hz DBPSK + RS FEC Weak Signal: FT8 - 8-tone GFSK, 15s periods FT4 - 4-tone GFSK, 7.5s periods JS8 - Keyboard-to-keyboard, FT8-based modulation WSPR - 4-FSK beacons, 2 min periods Narrowband: RTTY - 45.45/50/75 Bd CW/Morse - 5-55 WPM Olivia - 8/250, 8/500, 16/500, 16/1000, 32/1000 Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Harmonic Wave Equation Calc4 screens
DigiDecoder4 screens

Verdict

The call

The clearest difference is price: DigiDecoder at Free against Harmonic Wave Equation Calc's $2.99. DigiDecoder also leads on update cadence (every 4 days vs every 31 months) and ratings volume (8 vs 1). Harmonic Wave Equation Calc's advantage is rating (5.0 vs 4.5) and in-app purchases (none vs 3). On ads 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

DigiDecoder is free to download; Harmonic Wave Equation Calc costs $2.99 up front. DigiDecoder sells 3 in-app purchases, starting at $2.99 per month. Harmonic Wave Equation Calc asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Harmonic Wave Equation Calc holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: DigiDecoder has 8 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Harmonic Wave Equation Calc ships an update every 31 months, DigiDecoder every 4 days. The most recent releases landed on October 10, 2026 and October 15, 2026 respectively.

Scorecard7 real differences · 3 level
Harmonic Wave Equation Calc versus DigiDecoder: the parameters behind the verdict, then further details
ParameterHarmonic Wave Equation CalcDigiDecoder
Price$2.99Free — better
Rating5.0 (1 ratings) — better4.5 (8 ratings)
Positive reviews—50.0% of reviews
Number of ratings18 — better
Update frequencyEvery 31 monthsEvery 4 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS13 — better17.0
Further details — not scored
Size1 MB12 MB
Age rating4+4+
DeveloperNitrioLukasz Skierkowski

Customer experience

Harmonic Wave Equation Calc

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

DigiDecoder

All ratings8 ratings
Positive87.5%
Neutral0.0%
Negative12.5%
Written reviews4 reviews
Positive50.0%
Neutral25.0%
Negative25.0%

In-app purchases

None

Harmonic Wave Equation Calc

No in-app purchases

3 purchases

DigiDecoder

Subscriptions1
  • DigiDecoder Monthly7 Days trial$2.991 Month
One-time2
  • DigiDecoder TrialFree
  • DigiDecoder Lifetime$8.99

Questions

Is Harmonic Wave Equation Calc free?
Harmonic Wave Equation Calc costs $2.99, with no in-app purchases.
Is DigiDecoder free?
DigiDecoder is free to download, with in-app purchases available.
Which has better reviews, Harmonic Wave Equation Calc or DigiDecoder?
Harmonic Wave Equation Calc is rated higher. Harmonic Wave Equation Calc averages 5.0 out of 5 from 1 ratings, while DigiDecoder averages 4.5 from 8 ratings.
Do Harmonic Wave Equation Calc or DigiDecoder have ads?
Neither Harmonic Wave Equation Calc nor DigiDecoder shows ads.
Which is updated more often, Harmonic Wave Equation Calc or DigiDecoder?
Harmonic Wave Equation Calc ships an update every 31 months, and DigiDecoder every 4 days. Most recently, Harmonic Wave Equation Calc was updated on October 10, 2026 and DigiDecoder on October 15, 2026.

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