Comparison

Audio Function Generator vs SignalScope X

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

Head to head
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

About

SignalScope X

This app provides powerful measurement and analysis tools for acoustics, audio, and electronics. It offers a free oscilloscope and subscription-based tool sets for basic, advanced, and professional needs, compatible across iPhone, iPad, and Mac.

Highlights
  • Oscilloscope
  • FFT Analyzer
  • Spectrogram Analyzer
  • Data Recorder
  • Sound Intensity Analyzer
  • Room Acoustics Analyzer
Features
Read full description

SignalScope X offers a range of powerful measurement and analysis tools to enhance your productivity in areas such as acoustics (sound and vibration), audio, electronics, and electroacoustics. SignalScope X includes a free oscilloscope tool. SignalScope X makes additional tools available via 3 tiers of subscription-based tool sets to meet your basic, advanced, and professional needs. Each subscription works on your iPhone, iPad, and Mac. Features: - Analyze signals coming from the Mac or iOS device’s current audio input device. - Assign engineering units to your input signals and calibrate external transducers for accurate measurements. - Assign input channel units and sensitivities for individual USB Audio devices. - Connect lab-grade microphones and sensors to your Mac, iPad, or iPhone with suitable interface hardware for precise measurements. - SignalScope offers enhanced support for select hardware from Digiducer, The Modal Shop, and miniDSP. - Nominal acoustic sensitivities included for iPhone and iPad built-in microphones, voltage sensitivities for headset input (including the standard Lightning-to-headset adapter). - Manually switch between available audio input and output sources. - Load microphone frequency response data (FRD) and apply frequency response correction (FRC) to FFT-based measurements. - Manually adjust audio sample rates, even up to 768 kHz, depending on hardware. - Save acquired measurement data to CSV, TXT (tab-delimited), or MAT files. - Save high-resolution analyzer display images to PDF files. - Retrieve your data files from your device via Files (iCloud Drive), iTunes File Sharing, or through a web browser on another device. Files may also be opened in other compatible apps (e.g. Mail, Notes, Numbers, Dropbox, etc). Basic Tools: - Oscilloscope - MultiTool - Powerful data monitoring and project management (Add up to 6 subtools and save configurations for easy recall at a later time.) - FFT Analyzer - Spectrum analyzer with user-settable frequency limits and input triggering - 2D Real-time Spectrogram Analyzer - XY Plotter - Create Lissajous curves or visualize your stereo mix - Stereo Signal Generator Advanced Tools: (Advanced Tool Set also includes basic tools) - 3D Real-time Spectrogram Analyzer - Stunning live visualization of incoming data - Octave-band Analyzer - Whole and 1/3-octave RTA - Level Meter - Overall signal level meter - Max Levels - Traffic-light-style monitoring - Noise Dosimeter - Data Recorder - Stream up to 8 channels to WAV, AIF, or CAF audio files - Multi-channel Audio File Player - Analyze pre-recorded data Pro Tools: (Pro Tool Set subscription includes all tools) - Dual-channel System Analyzer (Dual FFT analysis with support for Frequency Response Magnitude/Phase, Phase Delay, Group Delay, Coherence, Impulse Response and Cross-Correlation) - Sound Intensity Analyzer - With a suitable p-p probe, measure sound intensity and acoustic particle velocity spectra (narrowband and whole or 1/3-octave bands) and time waveforms. - Room Acoustics Analyzer (T20, T30, T60, nonlinearity, EDT, Early Decay Time, Center Time, Clarity, and Definition in various frequency bands, adjustable Schroeder integration limits) - Polar Plot - Generate beautiful high-resolution plots of polar data. - STI/PA Analyzer - Direct STI and STIPA measurements Additional Pro Features: - User-defined custom metadata in saved audio and data files - Data logging support in the Level Meter, Octave Analyzer, and Noise Dosimeter - Percentile exceeded sound levels in the Level Meter and Octave Analyzer - NC, RNC, and NR references curves, NC, SIL, and NR values in the Octave Analyzer - Voltage decibel levels can be displayed in dBV or dBu Subscription Terms: - https://www.faberacoustical.com/apps/subscriptions/terms.html Privacy Policy: - https://www.faberacoustical.com/about/privacy.html Terms and Conditions for FaberAcoustical.com: - https://www.faberacoustical.com/about/terms.html

Screenshots

Audio Function Generator4 screens
SignalScope X4 screens

Verdict

The call

The clearest difference is review sentiment: Audio Function Generator at 77% against SignalScope X's 10%. Audio Function Generator also leads on rating (4.7 vs 3.0) and ratings volume (2.2K vs 23). SignalScope X's advantage is update cadence (every 3 weeks vs every 6 weeks). On price, 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

Both are free to download. Audio Function Generator sells 1 one-off in-app purchase and SignalScope X sells 10 in-app purchases, starting at $3.49 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Audio Function Generator holds the better App Store score, 4.7 against 3.0. That said, the two scores are not equally well evidenced: Audio Function Generator has 2.2K ratings behind it against 23, so its average is the more settled of the two. Written reviews point the same way: 77% of Audio Function Generator's written reviews are positive against 10% of SignalScope X's.

UpkeepUpdate frequency

Audio Function Generator ships an update every 6 weeks, SignalScope X every 3 weeks. The most recent releases landed on November 6, 2026 and November 10, 2026 respectively.

Scorecard5 real differences · 5 level
Audio Function Generator versus SignalScope X: the parameters behind the verdict, then further details
ParameterAudio Function GeneratorSignalScope X
PriceFreeFree
Rating4.7 (2.2K ratings) — better3.0 (23 ratings)
Positive reviews77.2% of reviews — better10.2% of reviews
Number of ratings2.2K — better23
Update frequencyEvery 6 weeksEvery 3 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPadiPhone, iPad, Mac — better
Requires iOS16.0 — better18.6
Further details — not scored
Size13 MB19 MB
Age rating4+4+
DeveloperThomas GruberFaber Acoustical, LLC

Customer experience

Audio Function Generator

All ratings2,211 ratings
Positive91.9%
Neutral3.1%
Negative5.0%
Written reviews272 reviews
Positive77.2%
Neutral6.3%
Negative16.5%

SignalScope X

All ratings23 ratings
Positive47.8%
Neutral4.3%
Negative47.8%
Written reviews118 reviews
Positive10.2%
Neutral2.5%
Negative87.3%

User reviews

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

SignalScope X

From 23 App Store ratings

What we love

  • 👍 Powerful software
  • 👍 Good for professional testing
  • 👍 Captures faint hums
  • 👍 Works well for waveforms
  • 👍 Useful for guitar debugging

Room to improve

  • 💸 Expensive subscription model
  • 💸 High one-time purchase cost
  • 💸 Perceived as a rip-off
  • 💸 Previous purchases invalidated
  • 💸 Lack of upgrade path

Bugs and requests

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)

SignalScope X

Reported bugs

9 issues
  • Recording starts and stops
  • App crashes on launch
  • Oscilloscope and FFT not functioning
  • SPL meter inaccurate/uncalibratable
  • App not working on older devices
Show 4 more
  • File type conflicts
  • Data scattered
  • App requires subscription for basic functionality
  • Old versions no longer supported/functional

Requested features

6 requests
  • Manual for better understanding
  • Ability to store and retrieve setups
  • One-off payment option
  • More intuitive user interface
  • Ability to change Y-axis scale
Show 1 more
  • Support for Audiobus output

In-app purchases

1 purchases

Audio Function Generator

One-time1
  • Upgrade to PRO$14.99
10 purchases

SignalScope X

Subscriptions6
  • Basic Tool Set, 1 Month14 Days trial$3.491 Month
  • Advanced Tool Set, 1 Month14 Days trial$9.991 Month
  • Pro Tool Set, 1 Month14 Days trial$24.991 Month
Show 3 more
  • Basic Tool Set, 1 Year14 Days trial$34.991 Year
  • Advanced Tool Set, 1 Year14 Days trial$99.991 Year
  • Pro Tool Set, 1 Year14 Days trial$249.991 Year
One-time4
  • 14-day Free Trial, Pro Tool SetFree
  • Basic Tool Set 2026$69.99
  • Advanced Tool Set 2026$199.99
Show 1 more
  • Pro Tool Set 2026 from Advanced$309.99

Questions

Is Audio Function Generator free?
Audio Function Generator is free to download, with in-app purchases available.
Is SignalScope X free?
SignalScope X is free to download, with in-app purchases available.
Which has better reviews, Audio Function Generator or SignalScope X?
Audio Function Generator is rated higher. Audio Function Generator averages 4.7 out of 5 from 2.2K ratings, while SignalScope X averages 3.0 from 23 ratings.
Do Audio Function Generator or SignalScope X have ads?
Neither Audio Function Generator nor SignalScope X shows ads.
Which is updated more often, Audio Function Generator or SignalScope X?
Audio Function Generator ships an update every 6 weeks, and SignalScope X every 3 weeks. Most recently, Audio Function Generator was updated on November 6, 2026 and SignalScope X on November 10, 2026.

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