Comparison

Predictable Flex vs Alto AAC

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

Head to head
About

Predictable Flex

Features
Read full description

Predictable is a multi-award winning text-to-speech app for people with conditions such as ALS/MND, autism, cerebral palsy, Down's syndrome, and more. It aims to make it easier and quicker to communicate, using a range of access methods, rate enhancement features and customisation options. Word Prediction Using smart word prediction technology, the app makes speaking out a text-based message easy. Predictable learns from your pattern of use and predicts what you will type next, making typing easier and more efficient. Phases and categories Save and organise phrases that you need quick access to in a simple grid format. Further customise your phrases by adding symbols, images, audio recordings, links and more. Shortcuts Choose from a wide range of useful and exciting features such as notes, share, translate, ChatGPT and draw to customise your keyboard screen to include features that you want to use. Attach these to keyboard keys, hot corners, head tracking gestures or external keyboard shortcuts. The possibilities are endless! Multi Language Switch between any of our 43 languages* to create your personalised bilingual set up. You are able to choose a primary and secondary language and seamlessly transition between both on the go, with appropriate keyboards and voices selected for both. Languages supported include: Arabic, Bangla, Bulgarian, Catalan, Chinese, Croatian, Danish, Dutch, English, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Kannada, Korean, Maithili, Malay, Marathi, Norwegian (Bokmal), Persian, Polish, Portuguese, Punjabi, Romanian, Russian, Slovak, Spanish, Swedish, Tamil, Telugu, Thai, Turkish, Ukrainian, Vietnamese, Gujarati, Urdu, Somali *Some languages only offered with online voices Speech and Voice Options Compatible with standard iOS voices, including the enhanced voices available to download and your iOS personal voice. You can also use your voice-banked voice from ModelTalker, Acapela, SpeakUnique and The Voice Keeper. Accessibility Predictable offers a wide range of access methods and accessibility settings including: Direct touch features to handle accidental selection Screen tap - a scanning method where you touch the screen for selection and/or progression Switch access - accessible via Bluetooth switch box + switches (compatible with Therapy Box Switch Box and RJ Cooper Switch Interface) as well as Head tracking face gestures. Head tracking - use facial recognition to interact with the app with no calibration or extra hardware required. Auditory preview - hear the onscreen text before selection. Scanning - Build your own, is a brand new access method in Predictable. Customise your own scanning method by combining timer, screen tap, switch access and gestures. Appearance Customise the layout and appearance to truly optimise the app to your preferences by changing the layout, font size, colours and more. Different keyboard options (including QWERTY, Ten Key, Apple and Bluetooth) and different templates (including Dark, High Contrast and Low vision) are available to make this customisation clear and simple. Web Platform Log in remotely and manage your settings and grid content from our web platform. The web platform is compatible with the myMessageBanking.com format to make importing easy. Support User guides are available on your app, and on the Therapy Box website. Send any questions to support@therapy-box.co.uk. You can find more about Predictable at https://therapy-box.co.uk/predictable Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Alto AAC

This app offers a customizable communication aid using visual tiles and typing to speak messages aloud. Personalize vocabulary with photos and organize it into categories for quick access. It supports multiple languages and is completely free to use.

Highlights
  • Visual vocabulary tiles
  • Phrase building
  • Customizable categories
  • Photo integration
  • Favorites and recent phrases
  • Multi-language support
Read full description

Alto AAC is a simple, customizable communication aid for people who benefit from augmentative and alternative communication (AAC). Build a message with clear visual tiles, type your own words, and tap the speaker to say it aloud. COMMUNICATE QUICKLY • Tap large visual vocabulary tiles to speak • Build phrases one word at a time • Type any message with the keyboard • Use Favorites and Recent phrases for faster access • Organize vocabulary into easy-to-reach categories MAKE IT PERSONAL • Create words and complete phrases • Add your own photos from the camera or photo library • Choose tile colors and familiar emoji • Reorder tiles with touch and hold • Edit, delete, or restore the default board at any time PRIVATE RECOMMENDATIONS Alto AAC always provides useful built-in suggestions on device. On supported devices, Apple Intelligence privately enhances them with short words that may naturally continue the current message. If Apple Intelligence is off or still preparing, built-in suggestions remain available. Recommendations never replace existing words and are only added or spoken after you select them. FOUR LANGUAGES Use Alto AAC in English, Brazilian Portuguese, Spanish, or French on iPhone and iPad, in portrait or landscape. FREE COMMUNICATION FOR EVERYONE Alto AAC is completely free. Communication, typing, speech, personalized vocabulary, custom categories, photos, Favorites, Recent phrases, and private recommendations are available without subscriptions or in-app purchases. Alto AAC is a communication aid. It is not a medical device, medical service, or emergency service. Do not rely on it as the only way to contact emergency services.

Screenshots

Predictable Flex4 screens
Alto AAC4 screens

Verdict

The call

The clearest difference is in-app purchases: Alto AAC at none against Predictable Flex's 2. Predictable Flex's advantage is update cadence (daily vs every 6 days) and iOS requirement (15.5 vs 17.0). On price, ads and device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Predictable Flex sells 2 in-app purchases, starting at $9.99 per month. Alto AAC asks for nothing beyond the download.

UpkeepUpdate frequency

Predictable Flex ships an update daily, Alto AAC every 6 days. The most recent releases landed on November 13, 2026 and October 31, 2026 respectively.

Scorecard3 real differences · 6 level
Predictable Flex versus Alto AAC: the parameters behind the verdict, then further details
ParameterPredictable FlexAlto AAC
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyDaily — betterEvery 6 days
AdsNoNo
In-app purchasesYesNo — better
Monetization—Free
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.5 — better17.0
Further details — not scored
Size1.7 GB5 MB
Age rating4+4+
DeveloperPrentke Romich CompanyGabriel Dutra

In-app purchases

2 purchases

Predictable Flex

Subscriptions2
  • Monthly Subscription$9.991 Month
  • Yearly Subscription$99.991 Year
None

Alto AAC

No in-app purchases

Questions

Is Predictable Flex free?
Predictable Flex is free to download, with in-app purchases available.
Is Alto AAC free?
Alto AAC is free to download, with no in-app purchases.
Do Predictable Flex or Alto AAC have ads?
Neither Predictable Flex nor Alto AAC shows ads.
Which is updated more often, Predictable Flex or Alto AAC?
Predictable Flex ships an update daily, and Alto AAC every 6 days. Most recently, Predictable Flex was updated on November 13, 2026 and Alto AAC on October 31, 2026.

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