Comparison

Doppler Effect Calculator vs FlashAlert Flashlight & Strobe

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

Head to head
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.

About

FlashAlert Flashlight & Strobe

This utility app provides a quick and dependable flashlight function with additional emergency strobe and SOS modes. It offers a convenient shake-to-toggle feature for easy activation, making it ideal for nighttime use and safety situations.

Highlights
  • Fast flashlight
  • Emergency strobe mode
  • SOS mode
  • Shake to toggle
  • Night use
  • Safety feature
Features
Read full description

A fast, reliable flashlight with emergency strobe and SOS mode. Shake your phone to toggle! Perfect for night use and safety.

Screenshots

Doppler Effect Calculator4 screens
FlashAlert Flashlight & Strobe4 screens

Verdict

The call

The clearest difference is price: FlashAlert Flashlight & Strobe at Free against Doppler Effect Calculator's $2.99. FlashAlert Flashlight & Strobe also leads on iOS requirement (15.0 vs 17.6). On rating, ratings volume, update cadence and ads 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

FlashAlert Flashlight & Strobe 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.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Doppler Effect Calculator against 5.0 for FlashAlert Flashlight & Strobe. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

UpkeepUpdate frequency

Doppler Effect Calculator ships an update every 26 months, FlashAlert Flashlight & Strobe every 17 months. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.

Scorecard3 real differences · 7 level
Doppler Effect Calculator versus FlashAlert Flashlight & Strobe: the parameters behind the verdict, then further details
ParameterDoppler Effect CalculatorFlashAlert Flashlight & Strobe
Price$2.99Free — better
Rating5.0 (1 ratings)5.0 (1 ratings)
Positive reviews0.0% of reviews—
Number of ratings11
Update frequencyEvery 26 monthsEvery 17 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.615.0 — better
Further details — not scored
Size1 MB26 MB
Age rating4+4+
DeveloperNitrioAndreas Conradi Nitschke

Customer experience

Doppler Effect Calculator

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

FlashAlert Flashlight & Strobe

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

In-app purchases

None

Doppler Effect Calculator

No in-app purchases

None

FlashAlert Flashlight & Strobe

No in-app purchases

Questions

Is Doppler Effect Calculator free?
Doppler Effect Calculator costs $2.99, with no in-app purchases.
Is FlashAlert Flashlight & Strobe free?
FlashAlert Flashlight & Strobe is free to download, with no in-app purchases.
Which has better reviews, Doppler Effect Calculator or FlashAlert Flashlight & Strobe?
Doppler Effect Calculator and FlashAlert Flashlight & Strobe are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do Doppler Effect Calculator or FlashAlert Flashlight & Strobe have ads?
Neither Doppler Effect Calculator nor FlashAlert Flashlight & Strobe shows ads.
Which is updated more often, Doppler Effect Calculator or FlashAlert Flashlight & Strobe?
Doppler Effect Calculator ships an update every 26 months, and FlashAlert Flashlight & Strobe every 17 months. Most recently, Doppler Effect Calculator was updated on November 2, 2026 and FlashAlert Flashlight & Strobe on October 30, 2026.

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