Communicative Function: Why We Use AAC
Chad Sherman · on 24 July 2026 · 7 min read · Last reviewed 24 July 2026
Communicative function refers to the purposes and goals behind using assistive speech software, such as expressing needs, asking questions, or engaging in conversation.
- AAC supports up to six core communicative functions, including requesting and commenting.
- Over 1.4 million people in the U.S. rely on AAC, according to the NIDCD.
- Symbol-based AAC apps increase vocabulary use by 30-50% in early users.
- Touchscreen AAC devices now dominate the market, accounting for 70% of new sales.
What are the core communicative functions in AAC?
Assistive speech software serves six primary communicative functions: requesting, labeling, commenting, asking, answering, and protesting.
For example, the requesting function lets users express needs like hunger or thirst. A user might tap a picture of an apple on their device to ask for one. Similarly, the commenting function allows users to share observations or emotions. A child using an AAC app might point to a picture of a dog and say, 'I see a dog!' to share their excitement.
How AAC supports each function
- Requesting: Users ask for items, actions, or information (e.g., 'I want juice').
- Labeling: Users name objects, people, or actions (e.g., 'This is a cat').
- Commenting: Users share thoughts or observations (e.g., 'It's raining').
- Asking: Users pose questions (e.g., 'What's that?').
- Answering: Users respond to questions (e.g., 'I like apples').
- Protesting: Users express discomfort or disagreement (e.g., 'I don't like that').
How do AAC apps serve communicative functions?
Speech Assistant apps transform smartphones and tablets into powerful communication tools, offering features like text-to-speech, symbol-based vocabulary, and customizable layouts.
For instance, Proloquo2Go, a popular iPad app, uses research-based vocabulary organization to support all six communicative functions. Its grid-based layout allows users to customize pages for specific needs, such as requesting food or commenting on activities. Similarly, TouchChat by Saltillo offers pre-programmed phrases and social scripts, helping users navigate conversations with ease.
How to get an AAC device for free?
Many organizations and programs offer free or low-cost AAC devices, including loans, grants, and insurance coverage.
School districts often provide AAC devices for students through Individualized Education Programs (IEPs). Nonprofits like the Communication Fund offer grants to cover device costs. Additionally, some insurance plans, including Medicaid, may cover AAC devices with proper documentation. For veterans, the VA provides AAC evaluations and devices as part of healthcare benefits.
To explore funding options, start with your local school district's special education team or contact nonprofits specializing in AAC access.
What is the most popular AAC app?
Proloquo2Go is one of the most popular AAC apps, known for its intuitive design and comprehensive features.
The app uses Minspeak language, which combines symbols and text to create efficient communication. It offers over 14,000 symbols and customizable vocabulary. Another top contender, Grid by Smartbox, provides flexibility with grid-based layouts and integration with eye-gaze technology.
How much does an AAC device cost?
AAC device costs vary widely, from free apps to high-end dedicated devices priced at several thousand dollars.
Basic AAC apps like Speech Assistant AAC are free or low-cost, while comprehensive apps like Proloquo2Go cost around $250. Dedicated devices, such as the Tobii Dynavox, range from $3,000 to $8,000, depending on features. Insurance, schools, or nonprofits often cover these costs.
Cost comparison of popular AAC options
| Option | Cost | Platform |
|---|---|---|
| Speech Assistant AAC | $0 | iOS, Android |
| Proloquo2Go | $249.99 | iOS, Android |
| TouchChat | $299.99 | iOS, Android |
| Tobii Dynavox | $3,000 - $8,000 | Dedicated device |
What is the speech assist app for free?
Speech Assistant AAC is a free app that turns Android devices into communication tools with text-to-speech and symbol support.
Here's the gist: Free speech assist apps democratize communication, offering essential features without financial barriers.
Pre-programmed phrases, customizable vocabularies, and personal message creation are all features of the app. It supports multiple languages and allows users to share messages via email or social media. For iOS users, Predictable offers a free trial with similar features, including word prediction and customizable voices.
Who would benefit from an AAC app?
AAC apps benefit individuals with speech impairments, including those with autism, cerebral palsy, or aphasia.
A child with autism might use an AAC app to request favorite foods or express emotions. An adult recovering from a stroke could rely on an AAC device to reconnect with family. Even temporary speech loss, such as after surgery, can be managed with AAC apps.
How to choose the right AAC app for your needs?
Choosing the right AAC app involves assessing communication goals, device compatibility, and customization options.
Start by identifying primary goals, such as requesting items or engaging in conversations. Consider the device you'll use, as some apps are platform-specific. Evaluate customization options, like symbol libraries or vocabulary organization. Trials and demos help test usability before committing.
Steps to choose an AAC app
- Identify primary communication goals (e.g., requesting, commenting).
- Choose a compatible device (iOS, Android, or dedicated AAC device).
- Explore customization options (symbols, vocabulary, layouts).
- Take advantage of free trials or demos.
- Consult with speech-language pathologists for personalized recommendations.
What are AAC apps?
Software applications designed to support communication for individuals with speech impairments, AAC apps offer features like text-to-speech and symbol-based vocabulary.
For example, Grid by Smartbox offers grid-based layouts and eye-gaze technology, while Predictable focuses on text-to-speech with word prediction. These apps empower users to communicate effectively in various settings, from classrooms to workplaces.
Why I love Grid by Smartbox
Grid by Smartbox is notable for its flexibility and advanced features, like eye-gaze technology and customizable layouts.
In my experience: Grid by Smartbox adjusts perfectly to personal communication styles, providing exceptional customization.
An app's grid-based system allows users to organize vocabulary in intuitive ways. Its compatibility with eye-tracking devices makes it accessible for users with limited mobility. Grid also supports integration with other assistive technologies, enhancing its versatility.
Review of TouchChat AAC App
TouchChat by Saltillo is a comprehensive AAC app offering pre-programmed phrases and customizable vocabulary.
Simply put: TouchChat combines ease of use with powerful features, making it a top choice for many AAC users.
An app features research-based vocabulary organization and social scripts for common situations. Its user-friendly interface supports quick navigation, while advanced features like word prediction enhance efficiency. TouchChat also offers multilingual support, catering to diverse communication needs.
Looking at AAC curriculum options
An AAC curriculum provides structured learning paths to develop communication skills using assistive speech software.
For example, the PACE Curriculum focuses on language development through AAC, while LAMP Words for Life follows a structured approach to teach vocabulary and grammar. These curriculums often include training for educators and caregivers to support consistent learning.
Incorporate AAC curriculum into daily routines to reinforce communication skills. Work with speech-language pathologists to tailor the curriculum to individual needs.
As you explore AAC options, consider how each app or device supports the core communicative functions essential for meaningful interactions.
Frequently asked questions
What is AAC and who benefits from it?
AAC, or Augmentative and Alternative Communication, supports individuals with speech impairments. It includes tools like speech-generating devices, sign language, and picture boards. People with conditions like cerebral palsy, autism, or aphasia often benefit significantly from AAC.
How does AAC improve daily interactions?
AAC bridges communication gaps by providing alternative ways to express needs, thoughts, and emotions. For example, a child with autism might use a picture exchange system to request a snack or indicate discomfort, fostering independence and reducing frustration.
Can AAC be used alongside natural speech?
Absolutely. AAC isn’t just for nonverbal individuals. It can complement natural speech for those with partial speech loss. For instance, a person with aphasia might use a combination of spoken words and a communication app to convey complex ideas more effectively.
What are common misconceptions about AAC?
Many assume AAC stunts speech development, but research shows the opposite. AAC provides a scaffold for language growth. Others think it’s only for severe disabilities, yet it’s also used by individuals with mild speech challenges or temporary conditions after surgery.