Tone Generator: Sine Wave

Tone Generator is an audio frequency generator, sine wave oscillator, and signal generator for Android. Generate pure tones from 1 Hz to 22 kHz with sine, square, sawtooth, and triangle waveforms, frequency sweep, and dual-tone output — replace expensive lab equipment with the phone you already carry.

▶ MAIN FEATURES
• Sine, square, sawtooth, and triangle waveforms
• Full 1 Hz – 22 kHz frequency range with 0.1 Hz precision
• Frequency sweep mode (rises or falls over time)
• Dual-tone and stereo output with independent channels
• Adjustable volume and left/right balance
• Precise frequency entry by slider or number
• Function generator and signal generator in one app
• Speaker, subwoofer, and hearing test tones
• Dark mode for studio and night use
• Works fully offline — no internet required

▶ HOW TO USE
1. Pick a waveform (sine gives the cleanest pure tone).
2. Set the frequency with the slider or type an exact value (e.g. 440 Hz).
3. Adjust the volume to a safe, moderate level.
4. Tap Play — the tone outputs instantly.
5. Use sweep or dual-tone mode for response and channel testing.

▶ WHO USES TONE GENERATOR
• Audio and AV engineers calibrating systems
• Musicians and instrument tuners working to exact Hz
• Speaker and subwoofer testers checking drivers
• Electronics hobbyists testing circuits and filters
• Science and physics students exploring sound and frequency
• Hearing-range testers generating reference tones

Use a moderate volume to protect your hearing and your speakers — high-frequency tones at high levels can cause damage. Start low and increase gradually.