Dog Whistle: Hz Tone Trainer

The clean, offline dog whistle — precise tone control from 100 Hz to 22 kHz.

Produce any frequency with a smooth logarithmic slider and tap play to send the tone through your speaker instantly. Whether you are teaching your puppy its first recall or running obedience sessions with an experienced dog, Dog Whistle gives you repeatable, consistent tones every time.

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PRECISE FREQUENCY CONTROL
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Sweep from 100 Hz (deep, audible bass) all the way up to 22,000 Hz with a single drag. A large live readout shows your exact frequency in Hz or kHz at all times. The logarithmic scale gives you fine-grained control at low pitches and fast sweeps in the high range — useful for finding the exact frequency your dog responds to.

A band pill below the display tells you at a glance whether you are in the low, mid, or high pitch range.

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ANIMATED VISUALIZER
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A real-time bar waveform reacts to the current frequency and animates while the tone plays. See the wave shape change as you drag the slider — helpful for training yourself to associate a visual with each frequency zone.

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SETTINGS THAT MATTER
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Output level — dial in-app volume from 5 % to 100 %, completely independently of your system volume. Combine both for precise, humane control without ever reaching dangerous levels.

Background play — enable this to keep the tone running after you lock the screen or switch apps. The tone always stops when you fully remove the app from Recents, so there are no surprises.

Haptics — a short vibration when playback starts or stops lets you feel the state change while you are focused on your dog.

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100 % OFFLINE
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No Wi-Fi. No account. No subscription. The tone engine generates a pure sine wave at a 44,100 Hz sample rate entirely on your device. Train in parks, forests, fields, or anywhere without mobile signal — the app works identically regardless of connectivity.

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HONEST ABOUT DEVICE LIMITS
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Most Android phones cannot accurately reproduce frequencies above 16–18 kHz. Dog Whistle does not promise ultrasonic or "silent to humans" behavior — it generates the signal up to 22 kHz, and your speaker determines how much of that actually reaches the air. A clear note on this is shown on first launch so you know exactly what to expect from your hardware.

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SAFE BY DESIGN
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A one-time safety reminder appears before your first session. Start at low volume and increase only if needed. Loud or prolonged sound can harm the hearing of both dogs and humans. This is an audio tool for adults training dogs under responsible, humane conditions — please follow local animal welfare guidelines.

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WHO USES DOG WHISTLE?
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• New puppy owners teaching their first sit and recall commands
• Obedience and agility trainers who need a repeatable, portable tone
• Sport-dog handlers maintaining consistent audio cues between sessions
• Pet owners replacing a physical dog whistle with their phone
• Audio hobbyists testing high-frequency speaker response on their device

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PRIVACY
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The full privacy policy and terms of service are linked in Settings.