Water eject and speaker cleaner for iPhone
Unda plays a low 165 Hz tone that makes the speaker vibrate and helps push trapped droplets out through the grille — the same idea as Water Lock on Apple Watch. When the program ends, play a test sound and mark it clearer or still muffled. Speaker and microphone tests, a tone generator and a decibel meter are in the same app. No account, no ads.
Free on the App Store · Water Eject and every test have no limits
Choose Light, Normal or Intensive and run up to three cycles with a short pause in between. Every program fades in and out and stays within the normal range of a phone speaker. Full Care and Vibration come with Unda Premium.
Water Eject · 1:00
Pulses and sweeps around 165 Hz to shake droplets loose from the grille. Free, with no limits.
Deep Clean · 1:30
A low-to-mid sweep for stubborn water, then 40 more seconds at the water eject tone.
Dust Removal · 1:00
Higher sweeps from 2 kHz up to 20 kHz help loosen dust and lint in the grille.
Earpiece · 0:45
Plays only through the earpiece. Hold the top of the phone facing down while it runs.
Headphones · 0:40
A quieter, shorter program through whatever is connected. Take them off and lay them mesh-side down first.
Turbo · Weekly Care
Turbo is a 30-second full-power burst at 165 Hz. Weekly Care is a gentle 45-second routine, with an optional Sunday reminder.
Unda is also a small audio test kit: check every speaker and the microphone, measure how loud it is around you, and play any tone you need.
Speaker test
A 15-second sweep from 20 Hz to 20 kHz reveals crackle and dropouts. The stereo test plays the left and right channels separately with a 440 Hz tone or 55 Hz bass, the earpiece test uses only the call speaker, and the microphone test records four seconds and plays them back.
Noise meter
An A-weighted reading in dBA from the phone's microphone, with the dominant frequency, minimum, average and maximum, a live spectrum, a history chart and reference levels from a whisper to a jet engine. It's an estimate, not a certified sound level meter: set a calibration offset if you have a reference meter to match. With Premium, dB Camera stamps photos with the level.
Tone generator
Swipe, slide or step by 1 or 100 Hz. Play through the left, right or both channels, sweep up to 20 kHz automatically, or stop on a timer. Presets include the 165 Hz water eject tone, tuning A at 440 Hz and hearing checks. Sine waves are free; square, triangle and saw come with Premium.
Siri
Say it and Unda opens and starts Water Eject. “Clean my speaker with Unda” works too.
Widgets
Tap the widget and Unda opens straight into Water Eject.
Reminder
An optional nudge on Sunday evenings to run the gentle 45-second Weekly Care program.
Private
No ads and no analytics. Cleaning history, noise readings and settings stay on your device.
Unda is free to download, with no ads and no account. Unda Premium is $4.99 a week or $19.99 a year with a 3-day free trial, $9.99 a month, or $29.99 once for life. Prices are in US dollars. Or get a year of Premium free with AppHunt.
Free
Water Eject, Deep Clean, Dust Removal, Turbo, Earpiece, Headphones and Weekly Care, every speaker and microphone test, the tone generator and the noise meter. No limits.
Unda Premium
The Full Care and Vibration programs, dB Camera photos stamped with the noise level, square, triangle and saw waveforms, and the hearing-check and ultrasonic presets.
Yearly
Starts with a 3-day free trial. Works out to about $1.67 a month.
Weekly
Starts with a 3-day free trial, then renews every week until you cancel.
Monthly
Renews every month. Cancel anytime in your Apple Account settings.
Lifetime
Pay once and keep Unda Premium. No subscription.
AppHunt special project
Unlock the AppHunt offer for 100 Hunt Points and redeem your code with Apple for one free year of Unda Premium. Earn points by signing up and checking in to AppHunt.
For new subscribers. Limited to 1,500 redemptions. Redeem before March 1, 2027 (Pacific Time). After one free year, Premium renews at the standard price unless canceled in Apple Account settings. Apple shows your local renewal price before you redeem.
It helps with water in the speaker grille. The 165 Hz tone makes the speaker membrane vibrate, which shakes droplets loose and helps push them out; it can't dry the inside of the phone. Run it as soon as possible after the phone got wet, with the speaker facing down and the volume at maximum, and repeat 2–3 times. If crackling remains after four cycles, the speaker may be damaged.
No. Unda can only help move water and dust out of the speaker grille with sound. It can't repair a damaged speaker or reverse water damage inside the phone, so if the sound stays distorted, a repair shop is the next step. Wait a few hours before charging a phone that got wet.
Yes. Unda plays clean tones within the normal range of a phone speaker, fades in and out to avoid clicks, and limits every program to a few minutes. Don't hold the phone to your ear while a program runs, and never wear headphones while one plays.
The speaker programs always play through the phone's own speaker, even when headphones are connected. The Headphones program plays through connected AirPods or headphones at a reduced level: take them off and lay them mesh-side down first. The tone generator and the headphones test play through whatever is connected.
It's an estimate. Unda measures through your phone's microphone and shows an A-weighted level in dBA, but phone microphones aren't calibrated instruments, so Unda isn't a certified sound level meter. If you have a reference meter, use the calibration offset in the Meter tab to match it.
Yes. Water Eject, Deep Clean, Dust Removal, Turbo, Earpiece, Headphones and Weekly Care, every test, the tone generator and the noise meter are free with no limits. Unda Premium adds Full Care, Vibration, dB Camera, extra waveforms and the hearing-check and ultrasonic presets.
No. The noise meter analyses sound on your device while it runs and keeps no audio. The microphone test keeps one short recording in temporary storage so you can play it back, and the next test overwrites it. Nothing is uploaded, and there's no account.
Yes. Unda runs on iPhone and iPad and tunes the water eject tone to the device: 165 Hz on most iPhones, 175 Hz on compact iPhones and 155 Hz on iPad. It supports light and dark mode and 32 languages.
Unda for iPhone. Free to download, with no limits on Water Eject or any test.