Comparison

Speech Assistant AAC vs Ratio S/Z

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

Head to head
About

Speech Assistant AAC

This text-to-speech app assists individuals with speech impairments by allowing them to create custom buttons with saved phrases for quick and easy communication. It offers extensive customization options for buttons, voices, and layout, and can be used during phone calls.

Highlights
  • Customizable phrase buttons with categories
  • Support for system and AI voices
  • Full-screen mode for large font display
  • Use during phone and FaceTime calls
  • Apple Watch integration
  • iCloud, Mail, and AirDrop backup
Features
Currently charting
Read full description

Speech Assistant AAC is a text-to-speech app designed for people who are speech impaired, for example due to Aphasia, MND/ALS, Autism, Stroke, Cerebral Palsy or other speech problems. With the app you can create categories and save phrases on buttons for quick access and easy communication. You can also type messages using the iOS keyboard. The app is affordable with a one-time payment and no subscription. Key features • Easy to use and fully customizable to your needs and preferences. • Categories and subcategories to organize your phrases. • History feature to quickly access previously entered phrases. • Option to add symbols, emoji or photos to the buttons. • Full screen mode to display your messages in large font. • Autocomplete feature to display phrase suggestions in a drop-down list. • Tabs for multiple conversations. • Designed for iPhone and iPad, supports both portrait and landscape orientation. • Supports Apple Watch. • Backup to iCloud, Mail or AirDrop. Voices • You can choose a voice from any of the iOS system voices. • Supports ElevenLabs voices, giving you the option to use highly realistic AI professional voice clones. • Supports Apple's Personal Voice. • Option to create voice recordings for the buttons and to import voice recordings. Phone calls • The app can also be used while making Phone and FaceTime calls. • This works with iOS system voices and with iOS 18 also with ElevenLabs voices and regular recordings (app setting). Categories and phrases • Add, change or delete your own (sub)categories and phrases. • You can create an unlimited number of categories to organize your phrases for quick access. • Create user profiles with their own categories, phrases and settings for multi-language support or different individuals. • Easily edit category and phrase buttons with a long press. • With Backup to iCloud or AirDrop you can transfer your categories and phrases to another iPhone/iPad. Fully Customizable • The size of the buttons, the textbox and the text can be adjusted. • The app has various color schemes and you can also create a personal color scheme. • You can change the order of the buttons with drag and drop. Full screen • Show your message full screen with a very large font. • Useful for communicating in a noisy environment. • You can rotate the text to show your message to the person opposite of you. Speech • The rate and pitch of the speech can be adjusted. • Option to speak each Word or Character directly while typing. • Optional highlighting of the spoken words. • Pause and resume speaking by tapping the speak button (optional setting). Apple Watch • The Watch app can especially be useful for communicating short messages. • On the go, you don't have to pick up your phone and can quicky communicate with the app on your wrist. Other features • Button to share your message to mail, text and social media. • Connect a bluetooth keyboard and create shortcuts for actions. • A custom keyboard can be enabled in the settings with customizable size, color and layout. • Abbreviations expansion to reduce keystrokes. • Attention sound button on Main and Full screen. • Option to select symbols from the set of 3400 Mulberry Symbols (mulberrysymbols.org). About the app • This app is developed by ASoft. • The app does not collect any data, so all your conversations stay private. • One-time payment, there is no subscription fee. • The app has won an innovation award: The Vodafone Mobiles For Good Challenge. • The app does not require an internet connection. • For feedback or questions, please contact: speechassistant@asoft.nl. • On www.asoft.nl you can find more information such as a user manual.

About

Ratio S/Z

Features
Currently charting
Read full description

Ratio S/Z is an app designed by Andreu Sauca, an experienced speech therapist and phoniatrician. It has been conceived as a tool for the evaluation and the monitoring of voice rehabilitation. Purpose: The app registers the maximum expiration and phonation time and the calculation of the phonation quotient (or ratio S/Z) by using the highest of the three values in each. The ratio S/Z test is a crucial part in every protocol of voice exploration. There might be different professional purposes for taking the test. In addition to the exploration purpose, the ratio S/Z can be used as a re-evaluation in case of being monitoring or before being discharged. In some cases, it can also be prescribed as a training for different objectives (this app can be used both by the speech therapist and by the patient) or as a screening tool to detect voice problems among some collectives such as teachers. Procedure: With the aid of the chronometers integrated in the ratio S/Z, the professional registers three samples of the highest time taken in the production of the [s] and other three samples on the highest time production of the [z]. Each chronometer shows the obtained values and highlights the highest one in blue. Automatically, the app uses these values to calculate the S/Z quotient, which appears in green or in red to indicate whether it is pathological or not. The interpretation of results varies according to some parameters (age and gender) is accessible through a specific button. As the age and sex of the patient can vary the interpretation of the results, a button allows the selection of which kind of patient is undergoing the test. This will give us not only a more accurate result, but it will also evaluate the phonation time length, this is a novelty of this app. Characteristics: -Careful design to enable an easy access and a right understanding of the results. -Two chronometers with three partial storing boxes each individually resettable. -Selection of the type of patient according to age and gender. -Resounding examples of the requested sound. -Color code to identify the result fields and buttons. -Start, stop and reset buttons for each chronometer. -Informative window about the test. -Help window to ease the interpretation of results, adapted to it. -Export your results to pdf. -Languages: Spanish, Catalan, Italian and English. More soon.

Screenshots

Speech Assistant AAC4 screens
Ratio S/Z4 screens

Verdict

The call

The clearest difference is price: Ratio S/Z at $2.99 against Speech Assistant AAC's $24.99. Ratio S/Z also leads on iOS requirement (11.0 vs 15.5). Speech Assistant AAC's advantage is update cadence (every 3 weeks vs every 3 months) and chart position (#23 vs #115). On ads, in-app purchases 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

Speech Assistant AAC costs $24.99 and Ratio S/Z $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Speech Assistant AAC ships an update every 3 weeks, Ratio S/Z every 3 months. Both last shipped on November 6, 2026.

Scorecard4 real differences · 7 level
Speech Assistant AAC versus Ratio S/Z: the parameters behind the verdict, then further details
ParameterSpeech Assistant AACRatio S/Z
Price$24.99$2.99 — better
Rating4.5 (105 ratings) — better—
Positive reviews81.3% of reviews—
Number of ratings105 — better—
Update frequencyEvery 3 weeks — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
Best chart rank#23 — better#115
DevicesiPhone, iPad, iPod, Apple WatchiPhone, iPad, iPod, Apple Watch
Requires iOS15.511.0 — better
Further details — not scored
Size131 MB25 MB
Age rating4+12+
DeveloperTon SchalkeMarina Sauca

Bugs and requests

Speech Assistant AAC

Reported bugs

17 issues
  • Default category button cannot be deleted
  • Images with transparent backgrounds turn white
  • Color picker does not work
  • Blank word slot in new subcategories cannot be deleted
  • Recorded or imported audio on buttons doesn't play on phone calls
Show 12 more
  • Cannot send voice message to WhatsApp
  • App crashes on iOS 17.5.1 on iPhone XS
  • Hex codes keep changing after input
  • Return key to send/speak disabled in latest update
  • Syncing from iPad to iPhone not happening
  • Categories don't stay on conversation when switching tabs
  • App keeps crashing/freezing
  • Option to not read directly seems to no longer work
  • Speech button not working
  • Syncing between iPhone and iPad not working
  • App crashes when another app uses speaker
  • Voice output not heard during phone calls

Requested features

42 requests
  • Ability to move sub-categories
  • Toggle for reading category names
  • Sub-sub-categories
  • Option to choose image files
  • Color picker for customization
Show 37 more
  • Delete blank word slot in subcategories
  • Send text to speech to WhatsApp
  • Shortcut to Control Panel
  • Ability to reset element sizes
  • Ability to clone own voice
  • Drag option for moving positions
  • Syncing between devices
  • More symbols for basic words
  • Control AI devices (Echo, Google)
  • Child voices for TTS
  • Option to use only iPhone/iPad speaker easily
  • Better autocorrect
  • Fix mispronunciation of words
  • Ability to print phrases from app
  • Change font size of settings/documentation
  • More than 5 choices in 'Clear/Restore'
  • Ability to create sub-categories
  • Record/import audio on phone calls
  • Full screen mode
  • Option for UK female voice
  • Draw within the app and convert to text
  • Customize buttons with color
  • Add own voice to phrases
  • Eye control app
  • Make pictures on text buttons appear in read-out windows
  • Use own pre-recorded voice
  • Text can be shown in large print
  • Add a lock on app configuration
  • Use own voice for TTS
  • More advanced audio options
  • Better integration with other apps
  • Option to not read directly when disabled
  • Full functionality access for recording sessions
  • Return key to send/speak functionality
  • Sync categories with conversation tabs
  • Ability to delete default category button
  • Support for other languages

Ratio S/Z

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Speech Assistant AAC

No in-app purchases

None

Ratio S/Z

No in-app purchases

Questions

Is Speech Assistant AAC free?
Speech Assistant AAC costs $24.99, with no in-app purchases.
Is Ratio S/Z free?
Ratio S/Z costs $2.99, with no in-app purchases.
Do Speech Assistant AAC or Ratio S/Z have ads?
Neither Speech Assistant AAC nor Ratio S/Z shows ads.
Which is updated more often, Speech Assistant AAC or Ratio S/Z?
Speech Assistant AAC ships an update every 3 weeks, and Ratio S/Z every 3 months. Most recently, Speech Assistant AAC was updated on November 6, 2026 and Ratio S/Z on November 6, 2026.
Which is more popular, Speech Assistant AAC or Ratio S/Z?
Speech Assistant AAC currently peaks at #23 in the App Store charts, and Ratio S/Z at #115. Chart position reflects recent download velocity rather than total install base.

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