Crisp: Speaker Test & Tone

Eject water from iPhone speakers in 3 minutes. Generate any tone from 20Hz to 22kHz. Test bass, mid, and treble. 100% offline. Lifetime purchase available.

What does Crisp do? Crisp generates precise audio frequencies to eject water from your iPhone speakers, test speaker quality, and dislodge dust from speaker grilles.

Is my data private? 100% offline. Nothing leaves your iPhone. No accounts, no analytics, no ads, no tracking.

How do I get started?

1. Place your iPhone face down on a soft surface
2. Set volume to maximum
3. Tap Start Eject and wait 3 minutes

What can I do with it?

• Eject trapped water using a 165Hz tone — the proven frequency for speaker vibration
• Generate any tone from 20Hz to 22kHz with sine, square, triangle, or sawtooth waveforms
• Test speaker frequency response with bass (80Hz), mid (1kHz), and treble (8kHz) presets
• Run stereo balance tests on left and right channels
• Sweep frequencies automatically to dislodge stubborn dust particles
• Save your favorite frequencies for one-tap recall

What devices does it work on? iPhone running iOS 17 or later. The same audio principles work on any built-in speaker.

Why use Crisp? Speaker grilles trap moisture from sweat, rain, pool splashes, and humidity. Dust and pocket lint accumulate over time. Crisp uses sound vibration — the same technique built into Apple Watch — to physically dislodge particles without opening your device or using cleaning tools that can damage internal components.

Does it really work? Sound vibration ejection is a well-documented technique. Results depend on how much water is trapped and how recently. For best results, run the cycle within an hour of water exposure, repeat 2 to 3 times, and keep the device face down throughout.

How much does it cost? 3-day free trial, then $1.99/week, $4.99/month, $29.99/year, or $79.99 lifetime. Cancel anytime in Settings.

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