Comparison

Tone Generator vs Signal Scope Studio

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

Head to head
About

Tone Generator

Features
Read full description

Tone Generator Tone Generator is a versatile audio tool that generates accurate test signals with fully customizable frequency, volume, and panning settings. It is designed for a wide range of applications, including acoustic calibration, audio equipment testing, and ear training. Supported Waveforms - Sine - Triangle - Sawtooth - Square Key Features - Customizable Frequency: Precision control across the audible range (e.g., 20Hz – 20kHz). - Volume Adjustment: Fine-tune the output level. - Panning Control: Adjust the balance between Left (L) and Right (R) channels. - Background Playback: Continues to run even when the app is in the background. - Intuitive UI: A simple, user-friendly interface for seamless operation. Common Use Cases - Speaker & Headphone Testing: Evaluate the performance and range of your hardware. - Hearing Sensitivity Checks: Verify your personal frequency response and hearing range. - Audio Equipment Calibration: Ensure your gear is tuned and balanced correctly. - Education & Training: A perfect tool for acoustic training and general audio education.

About

Signal Scope Studio

Features
Read full description

Signal Scope Studio combines a dual-channel oscillator, an output signal simulator, a live microphone oscilloscope and spectrum analyzer, and a stereo decibel meter in one audio toolkit. DUAL SIGNAL GENERATOR • Set sine, square, triangle, falling sawtooth, or white noise independently for LEFT and RIGHT • Adjust frequency from 20 Hz to 20 kHz and volume from 0 to 100% with 270-degree dials. Frequency also supports numeric entry • Adjust left and right frequency and volume independently, or link them while preserving the ratios at the time linking is enabled • Output different frequencies from the left and right channels to produce beats and other effects OUTPUT SIGNAL SIMULATOR • Linearly sum LEFT + RIGHT internally and display the waveform and spectrum together • Adjust Auto Trigger, freeze/resume, vertical and horizontal zoom, and refresh interval • Control frequency range, spectrum sensitivity, and FFT resolution with dials or pinch and pan gestures • Save high-resolution graphs with a dark navy background, white text, and green traces to Photos WAVESCOPE • Display the time-domain waveform and frequency spectrum of microphone input together in real time • Use Auto Trigger, freeze display, pinch zoom, and a movable settings window • Open Dual Signal Generator within the app and measure the actual sound emitted by the same device DECIBEL METER • Display relative microphone input levels on analog-style VU meters in real time • Automatically detect stereo or mono input: two separate meters for the left and right channels in stereo, or one meter in mono • Use PEAK indicators to spot brief sounds near the maximum input level • Save a calibration offset to match a commercial decibel meter MORE • All features are available for seven days from the original download date. After the trial, Dual Signal Generator and Decibel Meter remain free to use; a one-time purchase lets you continue using WaveScope. • Includes detailed offline manuals in Japanese, English, and French. • Supports iPhone and iPad in portrait and landscape. PLEASE NOTE • Measurements depend on the device and environment. • This app is intended for education, experiments, and general audio checks. It is not a substitute for calibrated instruments, certified sound-level meters, or medical devices.

Screenshots

Tone Generator4 screens
Signal Scope Studio4 screens

Verdict

The call

The clearest difference is in-app purchases: Tone Generator at none against Signal Scope Studio's 1. Tone Generator also leads on iOS requirement (17.6 vs 26.2). Signal Scope Studio's advantage is ads (none vs shown). On price, update cadence and device support there is nothing between them.

Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Both are free to download. Signal Scope Studio sells 1 one-off in-app purchase. Tone Generator asks for nothing beyond the download.

UpkeepUpdate frequency

Tone Generator ships an update every 2 weeks, Signal Scope Studio every 9 days. The most recent releases landed on October 16, 2026 and October 4, 2026 respectively.

Scorecard3 real differences Ā· 3 level
Tone Generator versus Signal Scope Studio: the parameters behind the verdict, then further details
ParameterTone GeneratorSignal Scope Studio
PriceFreeFree
Update frequencyEvery 2 weeksEvery 9 days — better
AdsYesNo — better
In-app purchasesNo — betterYes
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.6 — better26.2
Further details — not scored
Size5 MB14 MB
Age rating4+4+
DeveloperEiji ChibaKoji Hasegawa

In-app purchases

None

Tone Generator

No in-app purchases

1 purchases

Signal Scope Studio

One-time1
  • WaveScope Full Access$9.99

Questions

Is Tone Generator free?
Tone Generator is free to download, with no in-app purchases.
Is Signal Scope Studio free?
Signal Scope Studio is free to download, with in-app purchases available.
Do Tone Generator or Signal Scope Studio have ads?
Tone Generator shows ads; Signal Scope Studio does not.
Which is updated more often, Tone Generator or Signal Scope Studio?
Tone Generator ships an update every 2 weeks, and Signal Scope Studio every 9 days. Most recently, Tone Generator was updated on October 16, 2026 and Signal Scope Studio on October 4, 2026.

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