Comparison

SightKey vs Prism

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

SightKey

Features
Read full description

This is an innovative accessibility app that allows you to freely operate your iPhone just by moving your eyes. Track your gaze in real-time using ARKit's facial recognition technology. Even people who cannot use their hands and fingers as they would like can still type, communicate, and browse the web just by moving their eyes. ■ Line of sight dial You can operate the keyboard, which supports Japanese 50 sounds and English QWERTY, just by looking at it. Characters are entered just by looking at them (dwell input), and predictive conversion makes it even smoother. It also supports finger tapping. ■ Voice reading Read the entered text out loud on the spot. We provide easy support for communication for people who have difficulty expressing themselves. ■ Fixed phrase panel Pre-register frequently used words such as "Thank you" and "Give me some water." You can quickly call it up with your gaze and read it aloud right away. ■ Bookmark If you save frequently visited web pages, you can quickly access them using eye movements. ■ Calibration Custom adjust gaze accuracy according to eye characteristics. You can set the operation feeling that is best for your eyes. --- This app requires a TrueDepth camera (iPhone with a depth sensor on the front camera). This app is a must-use for people who have difficulty operating a smartphone due to physical conditions such as ALS, muscular dystrophy, spinal cord injury, or the aftereffects of a stroke, as well as their families and supporters. Towards a world where everyone can freely express their will. SightKey turns your "eyes" into your "hands." --- Support site: https://adolfoi.info/ Privacy Policy: https://adolfoi.info/page_id197/ Terms of Use: https://adolfoi.info/page_id501/ Contact us: https://adolfoi.info/support/ A Premium subscription (separate purchase) is required to use this app. After purchase, you can use all features, including eye-gaze browsing, text input, phrases, bookmarks, and advanced settings. Please check the in-app purchase screen for pricing and plans.

About

Prism

This app assists nonverbal individuals in communicating by tapping pictures to form spoken sentences. It supports 25 languages and offers features like word prediction, customizable boards, and on-device AI for privacy. Emergency communication and crisis phrases are always free.

Highlights
  • Picture-based sentence building
  • Speech output in 25 languages
  • On-device AI for privacy
  • Offline functionality
  • Apple Watch integration
  • Customizable vocabulary and grids
  • Hands-free input options
Features
Read full description

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. PRISM AAC SUBSCRIPTION Prism AAC is a subscription app: US$4.99 per month, with a 2-week free trial for new subscribers. Subscribe in the app with your Apple Account. Your subscription is linked to a free Synalux account, which you can create in one tap with Sign in with Apple, so the same subscription also works in the web app. Emergency communication, crisis phrases and bedside cards always stay free, with or without a subscription. Your subscription includes communication boards with 22 categories, a keyboard with word prediction, saved phrases, device voices and cached speech, on-device AI, visual schedules and therapeutic games. Each month it also includes 50,000 newly generated natural-voice speech characters and 100 cloud AI requests. Cached playback and device voices never use this allowance. The allowance resets on the first day of each month (00:00 UTC), and there are no overage charges. No ads. No data harvesting. Payment is charged to your Apple Account when you confirm the purchase, or when the free trial ends. The subscription renews automatically each month unless it is cancelled at least 24 hours before the end of the current period. You can manage or cancel it in your Apple Account settings. The price in your country is shown in the app before you subscribe. 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

SightKey4 screens
Prism4 screens

Verdict

The call

SightKey and Prism are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. SightKey sells 2 in-app purchases, starting at $4.99 per month and Prism sells 1 in-app purchase, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

ScorecardNo meaningful differences
SightKey versus Prism: the parameters behind the verdict, then further details
ParameterSightKeyPrism
PriceFreeFree
Rating—5.0 (3 ratings) — better
Number of ratings—3 — better
Update frequency—Every 5 days
AdsNoNo
In-app purchasesYesYes
Monetization—Subscription
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS15.0 — better16.0
Further details — not scored
Size11 MB26 MB
Age rating17+4+
DeveloperMitsuhiro HashimotoSynalux LLC

In-app purchases

2 purchases

SightKey

Subscriptions2
  • Premium (Monthly)$4.991 Month
  • Premium (Yearly)$49.991 Year
1 purchases

Prism

Subscriptions1
  • Prism AAC Cloud14 Days trial$4.991 Month

Questions

Is SightKey free?
SightKey is free to download, with in-app purchases available.
Is Prism free?
Prism is free to download, with in-app purchases available.
Do SightKey or Prism have ads?
Neither SightKey nor Prism shows ads.

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