DAF Pro vs DAF+N
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DAF Pro
This app uses delayed auditory feedback to help individuals who stutter or have Parkinson's speak more fluently. By hearing your voice with a slight delay, it naturally slows your speech rate, improving clarity and smoothness. It's designed for personal use and speech therapy sessions.
- Adjustable delay and pitch shift
- Low latency audio
- Background operation
- Speech recording and playback
- Wired and Bluetooth headset support
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DAF Pro helps people who stutter and people with Parkinson's slow down and speak more fluently. Put on headphones, speak, and hear your own voice a fraction of a second later. How It Works Delayed auditory feedback (DAF) is a clinically recognized speech therapy technique. Hearing your voice on a short delay naturally slows your speaking rate, which can make speech smoother and clearer. Research suggests DAF helps around 1 in 3 people who stutter, and it is also used to help people with Parkinson's control their speaking rate. Who It's For * People who stutter or stammer * People with Parkinson's disease * People with dysarthria * People who clutter * Speech-language pathologists, for therapy sessions and home practice Features * Adjustable delay and pitch shift * Very low latency, so short delays stay short * Keeps working in the background and with the screen off * Record and play back your speech * Works with wired and Bluetooth headsets. Bluetooth adds extra delay that varies by headset, so wired headphones work best for short delays. Getting Started Put on headphones, set the delay to around 50–100 ms, press Start and speak. Then adjust until your speech feels slower and steadier. Built by a UK speech and language therapist. One-time purchase: no subscription, no ads, no account needed. Questions or feedback? Contact us at support@speechtools.co
DAF+N
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DAF+Nは、自分の話した音声を少し遅らせて自分にフィードバックするアプリです。 フィードバックする際にスピーチノイズを加えることも可能です。 吃音などの構音障害の訓練用にご活用下さい。パーキンソン病などで発話制御が困難な方にも有効かもしれません。 なお、アプリを使用する際はイヤホンやヘッドフォンをご利用下さい。そのまま使用するとハウリングが起こります。
Screenshots
Verdict
The clearest difference is update cadence: DAF Pro at every 3 weeks against DAF+N's every 18 months. DAF Pro also leads on price ($5.99 vs $8.99) and chart position (#36 vs unranked). On ads, in-app purchases, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
DAF Pro costs $5.99 and DAF+N $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.
DAF Pro ships an update every 3 weeks, DAF+N every 18 months. Both last shipped on November 6, 2026.
| Parameter | DAF Pro | DAF+N |
|---|---|---|
| Price | $5.99 — better | $8.99 |
| Rating | 4.5 (97 ratings) — better | — |
| Positive reviews | 62.7% of reviews | — |
| Number of ratings | 97 — better | — |
| Update frequency | Every 3 weeks — better | Every 18 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Best chart rank | #36 — better | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 | 16.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Speechtools Ltd | Arcadia, Inc. |
In-app purchases
DAF Pro
No in-app purchases
DAF+N
No in-app purchases




