Comparison

Ultrasonic Repeller vs Audio Function Generator

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

Head to head
About

Ultrasonic Repeller

This app uses ultrasound technology to create a protective barrier against insects, rodents, and aggressive dogs. It also offers features for personal space and experimental bat deterrence, with advanced controls and Apple Watch integration.

Highlights
  • Insect repellent
  • Rodent deterrent
  • Dog deterrent
  • Personal space protector
  • Apple Watch support
  • High-precision frequency generator
  • Background mode
Features
Read full description

Discover the power of ultrasound technology right in your pocket!  Ultrasonic Repeller is a revolutionary app that transforms your iPhone into the ultimate protection device against a wide range of unwanted encounters. Key Features: Insect Repellent: Say goodbye to pesky mosquitoes and other bothersome insects. Rodent Deterrent: Keep mice and rats at bay with powerful ultrasonic frequencies. Dog Deterrent: Safely discourage aggressive dogs without harm. Personal Space Protector: Maintain your personal bubble in crowded spaces. Experimental Bat Repellent Mode: Test our cutting-edge technology designed to deter flying mammals. Advanced Functionality: EXCLUSIVE! Apple Watch Support: Take your protection to the next level with our Apple Watch app, allowing for quick and discreet activation right from your wrist! NEW! High-Precision Frequency Generator: Fine-tune your deterrent signals with our advanced, newly implemented frequency control system. Background Mode: Continuous protection even when your phone is locked. Live Activity Support: Quick access to controls from your lock screen. Dynamic Island Integration: Seamless monitoring on compatible iPhone models. Ultrasonic Repeller is incredibly user-friendly and absolutely ad-free! No need to invest in expensive hardware devices. Your iPhone, combined with our app, provides all the protection you need. Experience the future of personal safety and pest control. Download Ultrasonic Repeller now and take control of your environment!

About

Audio Function Generator

Generate various audio test tones, including sine, square, triangle, and sawtooth waves. Explore frequency and volume sweeps, noise generation, and custom preset creation. Advanced features like extended frequency ranges and multi-tone playback are available with an upgrade.

Highlights
  • Generate sine, square, triangle, and sawtooth tones
  • Frequency and volume sweep generation
  • Noise generation (white, pink, violet, etc.)
  • Custom preset creation and saving
  • Extended frequency range (PRO feature)
  • Multi-tone playback (PRO feature)
Features
Read full description

This is the highly recommended and praised Function Generator App - an amazingly great and powerful tone generator. Enriched with a vast amount of features yet it is extremely intuitive and designed for simplicity. Get to know this great App now! It is very well maintained and has received considerable upgrades over the past years. So, … what can you do with this App? • PLAY TEST TONES Sine, Rectangular, Triangular and Sawtooth. • PLAY FREQUENCY SWEEP TEST TONES in both directions (minimum to maximum frequency and maximum to minimum frequency). • PLAY VOLUME SWEEPS (from minimum to maximum volume). • Try the SWEEP REPEAT / WOBBLE function. • Try the MUSIC TONES PLAYBACK. • Experiment with the huge FINE TUNE SELECTON, PRESETS SELECTION! • Or create your own CUSTOM PRESETS! • And SAVE an endless amount of CONFIGURATIONS (Frequency, Sweep, Noise) for later quick access and direct playback function. • Even play back different kinds of NOISE – White, Pink, Violet, Grey, Brown, Blue is also supported. The Function Generator is AMAZINGLY INTUITIVE and SIMPLE to use! AND THESE ARE THE ADVANCED SETTINGS/FEATURES (upgrade to PRO required): => Extending The Frequency Range (1Hz - 21kHz) => Extending The Sweep Times (0.1s - 600s) => Changing Min/Max Slider Frequency Ranges => Changing Max Sweep Time Slider Range => Changing Signal Amplitude => Enabling Of The Sweep Repeat / Wobble Function => Frequency Slider Setting to Linear or Logarithmic => Left/Right Channel Individual Selection => Permanently Saving Custom Presets => Saving Of Endless Number Of Audio Configurations => Phase Out Setting (custom phase shift of the generated signal) => BPM (Beats per Minute) Feature => Dual Function Generator => MultiTone Generator (playback of up to eight individual tones) => Background Theme Selection (Light/Dark) Check out the tutorial page: www.ee-toolkit.com/audio-function-generator

Screenshots

Ultrasonic Repeller4 screens
Audio Function Generator4 screens

Verdict

The call

The clearest difference is price: Audio Function Generator at Free against Ultrasonic Repeller's $0.59. Audio Function Generator also leads on rating (4.7 vs 3.6) and review sentiment (77% vs 44%). Ultrasonic Repeller's advantage is in-app purchases (none vs 1). On update cadence, ads, device support and iOS requirement 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

Audio Function Generator is free to download; Ultrasonic Repeller costs $0.59 up front. Audio Function Generator sells 1 one-off in-app purchase. Ultrasonic Repeller asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Audio Function Generator holds the better App Store score, 4.7 against 3.6. That said, the two scores are not equally well evidenced: Audio Function Generator has 2.2K ratings behind it against 51, so its average is the more settled of the two. Written reviews point the same way: 44% of Ultrasonic Repeller's written reviews are positive against 77% of Audio Function Generator's.

UpkeepUpdate frequency

Ultrasonic Repeller ships an update every 2 months, Audio Function Generator every 6 weeks. The most recent releases landed on October 18, 2026 and October 17, 2026 respectively.

Scorecard6 real differences · 4 level
Ultrasonic Repeller versus Audio Function Generator: the parameters behind the verdict, then further details
ParameterUltrasonic RepellerAudio Function Generator
Price$0.59Free — better
Rating3.6 (51 ratings)4.7 (2.2K ratings) — better
Positive reviews43.6% of reviews77.1% of reviews — better
Number of ratings512.2K — better
Update frequencyEvery 2 monthsEvery 6 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, Apple WatchiPhone, iPad
Requires iOS16.116.0 — better
Further details — not scored
Size2 MB13 MB
Age rating4+4+
DeveloperAleksandr BalyberdinThomas Gruber

Customer experience

Ultrasonic Repeller

All ratings51 ratings
Positive58.8%
Neutral11.8%
Negative29.4%
Written reviews140 reviews
Positive43.6%
Neutral6.4%
Negative50.0%

Audio Function Generator

All ratings2,211 ratings
Positive91.9%
Neutral3.1%
Negative5.0%
Written reviews271 reviews
Positive77.1%
Neutral6.3%
Negative16.6%

User reviews

Ultrasonic Repeller

From 51 App Store ratings

What we love

  • ✅ Effective on mosquitoes and insects
  • ✅ Works on rodents when volume is high
  • ✅ Free app with no cost
  • ✅ Simple and intuitive interface
  • ✅ Multiple pest settings available

Room to improve

  • ❌ Inconsistent effectiveness across different pests
  • ❌ Doesn't work on dogs or older animals
  • ❌ Requires high volume to be effective
  • ❌ Limited range of effectiveness
  • ❌ Effectiveness diminishes over time as pests adapt

Audio Function Generator

From 2.2K App Store ratings

What we love

  • 👍 Great app
  • 🎶 Helps with Tinnitus
  • 💯 Best app I've paid for
  • 🔍 Highly recommended
  • 🎨 Attention to detail

Room to improve

  • 🐛 Crashes
  • 💰 Deceptive/Money hungry
  • 🔒 Basic features paywalled
  • 🔒 Limited without paying
  • 🔒 Removed functionality to push paid version

Bugs and requests

Ultrasonic Repeller

Reported bugs

9 issues
  • App crashes on startup (multiple iOS versions)
  • Incompatible with iOS 8 and older versions
  • App force closes when screen is locked
  • Crashes on iPhone 6s and later models
  • No sound output on iPad 1
Show 4 more
  • App doesn't open or loads to grey screen
  • Volume controls not accessible in app
  • Flickers and immediately closes
  • Compatibility issues with various iOS versions

Requested features

10 requests
  • Add cat repeller mode
  • Add bat repeller mode
  • Add ant repeller mode
  • Add fly repeller mode
  • Add snake repeller mode
Show 5 more
  • Background operation when screen locked
  • Better volume control interface
  • External speaker integration
  • Continuous operation mode
  • User instructions and support documentation

Audio Function Generator

Reported bugs

4 issues
  • Crashes on launch
  • Volume slider issues
  • Airplay not working
  • Sound distortion when display is active

Requested features

6 requests
  • Add download/save feature for custom sounds
  • Improve sweep function (continuous mode, better frequency control)
  • Add more multi-frequency rows
  • Implement 432Hz base frequency option
  • Add phase control for noise generators
Show 1 more
  • Improve accessibility (VoiceOver support)

In-app purchases

None

Ultrasonic Repeller

No in-app purchases

1 purchases

Audio Function Generator

One-time1
  • Upgrade to PRO$9.99

Questions

Is Ultrasonic Repeller free?
Ultrasonic Repeller costs $0.59, with no in-app purchases.
Is Audio Function Generator free?
Audio Function Generator is free to download, with in-app purchases available.
Which has better reviews, Ultrasonic Repeller or Audio Function Generator?
Audio Function Generator is rated higher. Ultrasonic Repeller averages 3.6 out of 5 from 51 ratings, while Audio Function Generator averages 4.7 from 2.2K ratings.
Do Ultrasonic Repeller or Audio Function Generator have ads?
Neither Ultrasonic Repeller nor Audio Function Generator shows ads.
Which is updated more often, Ultrasonic Repeller or Audio Function Generator?
Ultrasonic Repeller ships an update every 2 months, and Audio Function Generator every 6 weeks. Most recently, Ultrasonic Repeller was updated on October 18, 2026 and Audio Function Generator on October 17, 2026.

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