Sono Flex 4+

Tobii Dynavox LLC

    • 4.2 • 13 Ratings
    • $99.99



Tobii Sono Flex is an easy to use AAC vocabulary app that turns symbols into clear speech. It offers language to nonverbal users who are not yet in full control of literacy.
Sono Flex combines the benefits of structure and flexibility, providing a framework for language development, quickly matching individual and situational communication needs.
Tobii Sono Flex has been designed to be easy to operate and easy for SLPs, teachers, parents, caregivers or other communication partners to setup and customize.

--- Version and pricing ---
Tobii Sono Flex is a universal application available for iPhone, iPod and iPad. Users need only to buy the application once to run it on either device.
Tobii Sono Flex is also available in a slightly limited, but fully functioning evaluation version called Tobii Sono Flex Lite.
Educational institutions are eligible for a 50% Educational Discounts through Apple’s Volume Licensing Program for Education when buying more than 20 licenses (currently only available in the USA). Please contact your local Tobii representative for more information.

--- Some of the features of Tobii Sono Flex ---

- Combines core and topic-based vocabulary in a unique and dynamic way
- Provides an easy, and highly motivating, start with over 50 pre-made context vocabularies
- Comes with more than 11,000 SymbolStix® symbols
- Use the camera and photo albums of the iPhone or iPad to create your own symbols
- Comes with 5 US English, high quality Acapela voices; one boy, one girl, two women and one male voice.
- Offers a solid structure to build up a large common vocabulary and enables versatile communication
- Great flexibility in tailoring the vocabulary to individual and situational needs
- Develop within Tobii Sono Flex, into other Sono Suite products or even switch hardware platforms
- Tobii Sono Flex is available for iPhone, iPod, iPad and on regular PCs and dedicated speech devices running Tobii Communicator.
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--- Read what others say about Sono Flex ---

"Awesome, awesome, awesome! I wonder why it hasn’t been developed before. It is great to have the situational modules at hand so easily. This is just perfect for us to prepare sessions with clients with a minimum of time consumption. It is really nice that you have chosen very interactive and playful contexts that are age independent."
Alycia Berg, MS, CCC-SLP, Boston Children’s Hospital

"I have to say, I really like Sono Flex. I believe that the control that a user has over it is going to be very helpful and prove to be successful over other currently available products where one can just flip through screens without having access to a full communication system that supports interaction.
I really love the Context-based pages. It is great that you include phrases in these as well for quick interactions that are specific to the context-based pages. Glad to see About Me as a context page.
The way you can swap out context-based pages is really brilliant and helps to expand the communication opportunities without increasing the navigation demands."
Judy Lariviere, M.Ed., OTR/L, Communication Specialist, Rett Clinic, Oakland Children’s Hospital

"Looks good. I like the way the vocab is laid out and you can change one bottom bar it’s possibly the fastest way of changing vocab I have seen."
Will Wade, Lead Occupational Therapist at Kent Communication and Assistive Technology Service, Researcher at Oxford Brookes University, Operator of Apps for AAC website

"I love the vocabulary and the mix of core words and situations.
What I like: Layout of pages; no vertical scroll; grammar feature; situations, situations, situations. Editing is very different, but once I got used to it I liked it (I like to see the whole page as a list, that is cool)."
Kate Ahern, M.S.Ed., AT Specialist and Operator of ‘Teaching Learners with Multiple Special Needs’ Blog

What’s New

Version 2.0.0

This app has been updated by Apple to display the Apple Watch app icon.

Added iOS 11 compatibility.

Ratings and Reviews

4.2 out of 5
13 Ratings

13 Ratings

CosmicGoddess ,

Awesome AAC App!

I’m an Autistic person who uses this app when under extreme stress. More importantly, I introduced the lite version to my cousin, who is nonspeaking, Autistic, and has intellectual disability, some months ago, and went ahead and purchased the full version because it’s that great. It’s very intuitive for both of us and through it, he has expressed things he’s never before been able to.

The only complaint I have about this app is that editing pages is tedious and can rearrange things too much if you’re not careful, which impacts motor planning. Otherwise, I love Sono Flex and would recommend it for anyone who needs a relatively-inexpensive AAC solution.

Albie125 ,

Good, but...

I like most things about this AAC app, including simplicity. However, there are a few things that keep it from being 4-5 stars. First...the voice! The choices are awful...artificial and robotic. The child choices are especially awkward, which surprises me knowing a majority of this app's users are children. Second, there is no way to change the positioning of the context buttons. This is not functional for individuals with limited fine motor control who need frequently used buttons near the bottom or sides. You are able to change position of the word buttons within a context, but only in top to bottom order. This is completely contrary to the written word and speech which flows left to right, not top to bottom. Please consider changing these two big items. Otherwise, not sure it is worth $100 as is.

Teacher Tracey ,

Good but could be great with a few tweaks!

Sono flex is well organized and has many great boards for different themes. The quick phrase feature is very handy. It can be easily programmed with additional buttons and has features to choose the part of speech to be added into the Fitzgerald keyboard arrangement.

This app could move to being great if it had the option of speaking as each button is pressed. In the current version, one puts in a phrase by pressing any number of buttons but it does not speak each word while it is entered. it only speaks the completed phrase after touching a separate area. The quick phrase page is the only one to speak an entire phrase immediately when a button is pushed.

App Privacy

The developer, Tobii Dynavox LLC, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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