Ready to Start
Connect headphones and tap to begin
Wired headphones required for best results
Tap to Start
Voice Level
Quiet Target Zone Loud

This tool provides Delayed Auditory Feedback (DAF) and Frequency Altered Feedback (FAF) to help improve speech fluency. Used in therapy for stuttering, Parkinson's, and other speech conditions.

Delay (DAF)
Feedback Delay 75 ms
50-80ms for instant fluency at normal rate. 100-200ms for slow speech training.
Pitch Shift (FAF)
Frequency Shift 0 (Off)
Shift pitch up or down (±½ octave). Combined DAF+FAF can improve fluency up to 80%.
Audio Settings
Playback Volume 80%
Mic Boost 1.0x
Increase if your voice is too quiet in the feedback.
Therapy Presets
Instant Fluency
60ms delay, no pitch shift. Normal speaking rate.
DAF + FAF Combined
75ms delay, -2 pitch. Maximum effectiveness.
Slow Speech Training
200ms delay. Stretch vowels, speak slowly.
FAF Only
No delay, -3 pitch shift. Choral effect.
Tips for Best Results
Use wired headphones (Bluetooth adds latency)
Start with short delay (50-75ms) at normal speaking rate
For slow speech therapy, use 200ms and gradually reduce
Practice "constant voicing" - link words together smoothly
Work with a speech therapist for best outcomes

About Speech Feedback

Speech Feedback is a free daf/faf app from Sensory Shock. Delayed and frequency altered feedback. It's part of our learning and speech toolkit for early learners, special-education classrooms, and practice at home. Like every app on the site, it opens instantly in your web browser — no download, no account, and no cost — and works on tablets, phones, computers, and classroom touchscreens.

Frequently asked questions

What is Speech Feedback?

Delayed and frequency altered feedback. It's one of 115+ free accessibility apps on Sensory Shock.

Is Speech Feedback free?

Yes. Every Sensory Shock app is free forever — no paywalls, no accounts, and no sign-up. Open it and use it.

Do I need to download or install anything?

No. Speech Feedback runs entirely in your web browser on phones, tablets, Chromebooks, laptops, and interactive whiteboards.

Can I use Speech Feedback in a classroom?

Yes — it works on classroom touchscreens, Chromebooks, and tablets, and there's nothing to install, so it's easy to use at school.

Last updated: · Part of Sensory Shock — 115+ free accessibility apps, free forever.