Speech AAC vs Prism
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Speech AAC
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Speech AAC Assist is a professional-grade Augmentative and Alternative Communication (AAC) app designed for people with speech disabilities, autism, ALS, stroke recovery, cerebral palsy, and anyone who needs a voice. COMMUNICATE INSTANTLY Tap words to build sentences and speak them aloud using real human voices (Adam & Liza) or your device's built-in text-to-speech. Every word is spoken clearly and naturally. REAL HUMAN VOICES Choose between two professionally recorded voices — Adam and Liza — with over 3,700 words recorded by real people. When a word isn't recorded, the app seamlessly falls back to text-to-speech so you're never left silent. YOUR BOARDS, YOUR WAY Build custom communication boards for every situation — medical appointments, school, home, social settings, and more. Pin your most-used boards to the top for instant access. Includes 12 professionally designed starter boards based on AAC research: • Core Vocabulary (36 high-frequency words covering 80% of daily communication) • Quick Phrases • Feelings & Emotions • Medical & Health • Food & Drink • People & Family • Places & Activities • Emergency (speaks immediately — no extra taps) QUICK ACCESS BAR Six emergency communication buttons — Help, Yes, No, Stop, Pain, I Need — are always visible on screen and speak instantly with one tap. No building a sentence required. FULLY ACCESSIBLE SpeakEasy AAC is built from the ground up for people with disabilities: • Section 508 and WCAG 2.1 AAA compliant • Full VoiceOver support with labels, hints, and traits on every element • Switch Control compatible • Auto-scan mode for single-switch users • Large touch targets (minimum 60×60pt everywhere) • High contrast mode • Adjustable button size, font size, and emoji size • Reduce Motion support • Caregiver PIN lock to protect settings KEYBOARD INPUT Prefer to type? Switch to keyboard mode and type anything — SpeakEasy will speak it instantly. Great for literate users who need faster input. MEDICATION REMINDERS Never miss a dose. Set up daily medication reminders with customizable times and get notified right on your device. COMMUNICATION LOG Track progress over time with a built-in communication log. See daily and weekly stats, most-used words, and share reports with therapists and caregivers via CSV export. WORKS OFFLINE Everything works completely offline. No internet connection required. No accounts. No subscriptions. Your communication is private and always available. CAREGIVER & THERAPIST FRIENDLY PIN-protected settings keep the app configured the way you need it. Caregivers and speech-language pathologists can set up boards, customize vocabulary, and lock the interface so users always see the right layout. CUSTOMIZABLE EVERYTHING • 6 background color themes • Adjustable speech rate and pitch • 4 word organization modes • Multiple language support • Dark mode compatible SpeakEasy AAC Assist is built with love by PayneBrain Studios — a team dedicated to making technology work for everyone.
Prism
This communication app provides on-device AI and supports 12 languages, offering a private and accessible way for nonverbal users to express themselves. It functions fully offline and can be controlled from an Apple Watch, making communication possible anywhere, anytime.
- On-device AI
- Apple Watch support
- 12 languages
- Offline functionality
- Customizable vocabulary
- No subscriptions or ads
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Prism AAC helps nonverbal children and adults talk. Tap pictures, build sentences, and hear them spoken aloud — in 25 languages, on iPhone, iPad and Apple Watch. Core communication is free and works without an account or an internet connection: communication boards with 22 categories, a keyboard with word prediction, saved phrases, device voices and cached speech, on-device AI, visual schedules, therapeutic games and emergency communication. No ads. No data harvesting. Your child's voice never depends on WiFi. PRISM AAC CLOUD — optional subscription US$4.99 per month adds a monthly allowance of 50,000 newly generated natural-voice speech characters and 100 cloud AI requests. Cached playback and device voices never use the allowance. The allowance resets on the first day of each month (00:00 UTC), and there are no overage charges. The same subscription works on iOS and on the web with one account. Boards, saved phrases, cached speech, device voices, on-device AI and emergency communication stay available without a subscription and after one ends. Payment is charged to your Apple Account when you confirm the purchase. The subscription renews automatically each month unless it is cancelled at least 24 hours before the end of the current period, and it can be managed or cancelled in your Apple Account settings after purchase. WHY PRISM AAC - Privacy first: on-device AI keeps your words on your device - Works offline: boards, saved phrases and cached speech need no connection - Apple Watch: communicate directly from your wrist - 25 languages, including Simplified, Traditional and Hong Kong Chinese - Customizable vocabulary, grid size, themes and motor accommodations - Hands-free input: head tracking, switch scanning, gestures and voice - Caregiver tools: schedules, notes, insights and a caregiver PIN Terms of Use: https://synalux.ai/terms Privacy Policy: https://synalux.ai/privacy
Screenshots
Verdict
The clearest difference is in-app purchases: Prism at none against Speech AAC's 6. On price, ads, 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
Both are free to download. Speech AAC sells 6 one-off in-app purchases. Prism asks for nothing beyond the download.
| Parameter | Speech AAC | Prism |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Number of ratings | — | 2 — better |
| Update frequency | — | Every 2 days |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | — | Free |
| Devices | iPhone, iPad | iPhone, iPad, Apple Watch — better |
| Requires iOS | 17.6 | 16.0 — better |
| Further details — not scored | ||
| Size | 129 MB | 13 MB |
| Age rating | 12+ | 4+ |
| Developer | Carlton Payne III | Synalux LLC |
In-app purchases
Speech AAC
- Small Tip$0.99
- Medium Tiip$4.99
- Large Tip$9.99
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- Huge Thank You!$19.99
- Champion!$49.99
- Legend!$99.99
Prism
No in-app purchases






