Comparison

RockCONNECT vs Doppler Effect Calculator

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

Head to head
About

RockCONNECT

Features
Read full description

RockCONNECT allows you to remotely connect and configure your Rock Seven devices from your iPhone or iPad. It allows you to adjust tracking frequency, GPS accuracy settings, and much more. Compatible with Bluetooth LE versions of the RockSTAR and RockFLEET products, purchased after 1st October 2014.

About

Doppler Effect Calculator

This physics and math calculator helps determine the frequency of sound waves when the source or observer is in motion. It provides instant calculations with copyable results and includes reference formulas. The app supports various units and high precision, working seamlessly on iOS devices.

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

Doppler Effect Calc is a practical physics and audio calculator designed for students, teachers, engineers, sound designers, and anyone working with waves, frequency, sound level, and distance-based attenuation. The app brings together essential acoustic calculation tools in one clean, fast, and easy-to-use interface, helping you solve common sound and wave problems without manual formulas or complicated spreadsheets. Calculate Doppler effect frequency shifts when a sound source or observer is moving. Enter the original frequency, source speed, observer speed, and speed of sound to quickly estimate the perceived frequency. This is useful for physics learning, classroom demonstrations, audio experiments, vehicle sound analysis, and understanding real-world wave behavior. The app also includes decibel calculation tools for working with sound intensity and sound pressure levels. Whether you are comparing level changes, checking dB differences, or learning how logarithmic sound measurement works, Doppler Effect Calc helps make the numbers easier to understand. With the distance attenuation calculator, you can estimate how sound level changes as distance increases or decreases. This is especially helpful for acoustic planning, speaker placement, field measurements, educational examples, and general sound propagation study. Doppler Effect Calc is built for quick, focused calculations. The interface keeps inputs clear, results readable, and formulas easy to reference. A calculation history lets you review previous results, compare values, and avoid repeating work. Built-in reference and information sections provide useful context for the formulas and concepts behind each calculator. Key features include: • Doppler effect frequency calculator • Decibel and sound level tools • Distance attenuation calculator • Calculation history for reviewing previous results • Clear input fields and readable output • Helpful reference information for physics and acoustics • Support for multiple languages • Clean design for study, work, and quick everyday use Whether you are studying wave physics, teaching acoustics, analyzing sound behavior, or simply need a reliable frequency and dB calculator, Doppler Effect Calc gives you a convenient toolkit for fast and accurate sound-related calculations. Thanks for your support, and do visit nitrio.com for more apps for your iOS devices.

Screenshots

RockCONNECT2 screens
Doppler Effect Calculator4 screens

Verdict

The call

The clearest difference is price: RockCONNECT at Free against Doppler Effect Calculator's $2.99. RockCONNECT also leads on update cadence (every 2 months vs every 26 months) and iOS requirement (13.0 vs 17.6). On 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

RockCONNECT is free to download; Doppler Effect Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

RockCONNECT ships an update every 2 months, Doppler Effect Calculator every 26 months. Both last shipped on October 8, 2026.

Scorecard3 real differences · 7 level
RockCONNECT versus Doppler Effect Calculator: the parameters behind the verdict, then further details
ParameterRockCONNECTDoppler Effect Calculator
PriceFree — better$2.99
Rating—5.0 (1 ratings) — better
Positive reviews—0.0% of reviews
Number of ratings—1 — better
Update frequencyEvery 2 months — betterEvery 26 months
AdsNoNo
In-app purchasesNoNo
Monetization—Paid
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better17.6
Further details — not scored
Size17 MB1 MB
Age rating4+4+
DeveloperGround Control Technologies UK LtdNitrio

In-app purchases

None

RockCONNECT

No in-app purchases

None

Doppler Effect Calculator

No in-app purchases

Questions

Is RockCONNECT free?
RockCONNECT is free to download, with no in-app purchases.
Is Doppler Effect Calculator free?
Doppler Effect Calculator costs $2.99, with no in-app purchases.
Do RockCONNECT or Doppler Effect Calculator have ads?
Neither RockCONNECT nor Doppler Effect Calculator shows ads.
Which is updated more often, RockCONNECT or Doppler Effect Calculator?
RockCONNECT ships an update every 2 months, and Doppler Effect Calculator every 26 months. Most recently, RockCONNECT was updated on October 8, 2026 and Doppler Effect Calculator on October 8, 2026.

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