FreqForge is a precision tone and frequency generator designed for
musicians, audio engineers, scientists, and hearing researchers worldwide.

Built with an oscilloscope-inspired interface and real-time waveform
visualization, FreqForge feels like a real signal instrument — not just
another basic app.

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🎛️ CORE GENERATOR
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• 4 waveforms: Sine, Square, Triangle, Sawtooth
• Full hearing spectrum: 20 Hz – 20,000 Hz
• Logarithmic slider — pitch feels natural as you sweep
• Fine-tune: ±0.1 / ±1 / ±10 / ±100 Hz nudge buttons
• Octave jump: ×½ down, ×2 up
• Tap the frequency display to type any exact value

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📡 OSCILLOSCOPE DISPLAY
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• Real-time waveform animation
• Neon glow trace on playback — the instrument feel
• Animated waveform scrolls with frequency

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🔊 DUAL TONE MODE
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• Two independent channels, A and B
• Play two frequencies simultaneously
• Perfect for binaural beat research and intermodulation tests

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📉 SWEEP MODE
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• Sweep from any start to end frequency
• Logarithmic sweep (natural) or linear
• Adjustable duration: 1–60 seconds
• Real-time progress bar with current frequency readout
• Perfect for: room acoustics, speaker response, hearing range tests

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💾 PRESETS
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• 10 built-in reference frequencies:
A4 440 Hz · C4 261.63 Hz · 40 Hz Gamma · 100 Hz Bass
1 kHz Reference · 10 kHz High · 20 Hz Sub-Bass
432 Hz Natural · 528 Hz Solfeggio · 7500 Hz Tinnitus Ref
• Save unlimited custom presets
• Quick-access preset strip on the main screen

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🎧 BACKGROUND PLAYBACK
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• Tone continues when you switch apps
• Persistent notification shows current frequency & waveform
• Stop instantly from the notification bar
• Audio focus management: pauses during calls, resumes after

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⚙️ OTHER FEATURES
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• No ads · No analytics · No internet required
• Keep screen on during playback (optional)
• Toggle oscilloscope display on/off
• 11 languages: English, 简体中文, 繁體中文, 日本語, 한국어,
Deutsch, Français, Español, Português, Русский, العربية

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⚠️ HEARING SAFETY
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FreqForge can produce continuous tones at any frequency and volume.
High volumes can damage hearing. Always start low and test comfortably.
FreqForge is not a medical device and is not for clinical use.

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WHO USES FREQFORGE?
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Musicians: Tune instruments to any reference pitch
Audio engineers: Test speakers, amps, and room acoustics
Scientists: Frequency-specific experiments
Students: Explore acoustics and psychoacoustics
Curious users: Discover the limits of human hearing
Tinnitus sufferers: Match and track tinnitus frequency