Comparison

TD Snap® vs Echo

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

Head to head
About

TD Snap®

This communication software assists individuals with speech and language disabilities by offering symbol-supported and text-based communication options. It features customizable page sets and editing tools, accessible via touch, eye gaze, and switch access. A subscription is required after a trial period.

Highlights
  • Symbol-supported and text-based page sets
  • Customizable editing tools
  • Touch, eye gaze, and switch access
  • Picture Communication Symbols library
  • Visual schedules and timers
  • Cloud-based content syncing
Features
Read full description

TD Snap® is a flexible, robust communication software for people with speech and language disabilities such as autism, cerebral palsy and aphasia. Created by Tobii Dynavox, a leader in augmentative and alternative communication (AAC), TD Snap provides a choice of evidence-based, professionally developed page sets designed to meet different communication needs and preferences, with both symbol-supported and text-based options. TD Snap includes easy-to-use editing tools to create a personalized experience, and is accessible via touch, eye gaze and switch access methods. A monthly subscription is required to enable speech following a 1-month trial period. Tobii Dynavox offers complementary resources to help communicators, caregivers, and professionals succeed with TD Snap. These resources can be found by visiting myTobiiDynavox.com or tobiidynavox.com. Have you purchased a Tobii Dynavox device and looking to use your companion TD Snap license on an iOS device? Download this app and log into myTobiiDynavox in the start-up wizard. Customizable TD Snap Page Sets: • Core First: A symbol-supported page set enabling a path to literacy at any stage of language development, now also available in High contrast • Motor Plan: A symbol-supported page set enabling efficient language acquisition at any age, custom designed for both touch and eye gaze • Express: A symbol-supported page set to help people express themselves using theme-based phrases and words, now also available in bilingual Spanish/English • Text: A page set for those who are literate or transitioning from symbol supports to literacy • Scanning: A page set for those who use scanning as their primary access method, • Aphasia: A page set to help adults with aphasia communicate while also supporting language recovery , now also available in bilingual Spanish/English • PODD*: A page set based on the Pragmatic Organization Dynamic Display vocabulary strategy, developed by AAC expert Gayle Porter • Gateway*: A page set based on the Gateway vocabulary strategy, developed by Joan Bruno *Denotes in-app purchase of an additional monthly subscription per page or symbol set. Developed by a third party. Powerful Set of Integrated TD Snap Tools: • Editing: An intuitive editing tool to help customize buttons to meet a communicator’s unique needs • Diversity: A variety of diversity settings that let you customize skin tone, hair shades, and more • PCS: A built-in library of over 75,000 Picture Communication Symbols translated into over 25 languages • Search: A search bar to locate words and symbols with an easy and accessible path to find them • Visual Supports: A set of supports like visual schedules, timers, and scripts • Google Assistant: An integrated tool enabling symbol-supported access to Google Assistant • QuickFires: A set of commonly used pre-programmed phrases to make communication smoother • myTobiiDynavox: A cloud-based resource for backing up, sharing, and syncing customized content. How Subscriptions Work Following the 1-month free trial, your Apple ID payment method on file will automatically be charged monthly unless you cancel 24 hours before the trial ends. Subsequent monthly payments will be charged to your Apple ID payment method 24 hours before the end of each period. Your subscriptions are managed in account settings on the App Store. TD Snap® is a trademark and registered trademark of Tobii Dynavox AB. Tobii Dynavox cannot guarantee compatibility of TD Snap with any non-Tobii Dynavox brand of hardware and will not offer technical support for compatibility issues. All downloads are governed by TD Snap License Agreement for Download.

About

Echo

This communication aid uses auditory scanning for individuals with visual and physical impairments. It offers sound cues and distinct voices for navigation and expression, accessible via switches, gestures, or arrow keys.

Highlights
  • Auditory scanning communication method
  • Sound cues for navigation
  • Separate voices for cues and speech
  • External switch access
  • Swipe gesture control
  • Arrow key navigation
Features
Read full description

Echo is an AAC app designed for those with a visual difficulty and physical difficulty to access communication. Echo is based around the concept of auditory scanning. Auditory scanning is a communication method using sound cues or auditory feedback rather than visual cues. This method is especially valuable for those with a visual impairment who cant access visual based AAC. Echo provides you with two different voices, one for your auditory cues and the another to represent your voice. You can access Echo using the following methods. - Any external switch (or combination of switches) - Swipe Gestures - Arrow Keys We have plans to extend this in the future to allow for more access methods.

Screenshots

Echo4 screens

Verdict

The call

The clearest difference is rating: Echo at 5.0 against TD Snap®'s 4.2. Echo also leads on in-app purchases (none vs 10) and update cadence (every 2 weeks vs every 2 months). TD Snap®'s advantage is ratings volume (810 vs 1) and iOS requirement (13.0 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. TD Snap® sells 10 in-app purchases, starting at $4.99 per month. Echo asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Echo holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: TD Snap® has 810 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

TD Snap® ships an update every 2 months, Echo every 2 weeks. The most recent releases landed on September 21, 2026 and June 1, 2026 respectively.

Scorecard6 real differences · 4 level
TD Snap® versus Echo: the parameters behind the verdict, then further details
ParameterTD Snap®Echo
PriceFreeFree
Rating4.2 (810 ratings)5.0 (1 ratings) — better
Positive reviews29.6% of reviews—
Number of ratings810 — better1
Update frequencyEvery 2 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationSubscriptionFree — better
DevicesiPadiPhone, iPad — better
Requires iOS13.0 — better17.0
Further details — not scored
Size3.4 GB9 MB
Age rating4+4+
DeveloperTobii Dynavox LLCAce Centre

Customer experience

TD Snap®

All ratings810 ratings
Positive77.5%
Neutral6.0%
Negative16.4%
Written reviews142 reviews
Positive29.6%
Neutral6.3%
Negative64.1%

Echo

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

TD Snap®

Reported bugs

4 issues
  • Voice disappearing after updates
  • Crashes on launch
  • Incompatibility with iPad Pro
  • Inability to restore purchased content

Requested features

5 requests
  • Ability to change undo symbol
  • Link to ACCIL image database
  • Ability to set user age for appropriate vocabulary
  • More robust core vocabulary
  • Easier grammar modeling

Echo

Not enough reviews yet to summarise bugs or requests.

In-app purchases

10 purchases

TD Snap®

Subscriptions4
  • Gateway Monthly1 Month trial$4.991 Month
  • PODD Monthly1 Month trial$4.991 Month
  • Metacom Monthly1 Month trial$4.991 Month
Show 1 more
  • Speaking Upgrade Monthly1 Month trial$9.991 Month
One-time6
  • Acapela Voices$39.99
  • Nuance Voices$39.99
  • Speaking Upgrade$49.99
Show 3 more
  • METACOM Symbols$49.99
  • PODD Page Sets$149.99
  • Gateway Page Sets$149.99
None

Echo

No in-app purchases

Questions

Is TD Snap® free?
TD Snap® is free to download, with in-app purchases available.
Is Echo free?
Echo is free to download, with no in-app purchases.
Which has better reviews, TD Snap® or Echo?
Echo is rated higher. TD Snap® averages 4.2 out of 5 from 810 ratings, while Echo averages 5.0 from 1 ratings.
Do TD Snap® or Echo have ads?
Neither TD Snap® nor Echo shows ads.
Which is updated more often, TD Snap® or Echo?
TD Snap® ships an update every 2 months, and Echo every 2 weeks. Most recently, TD Snap® was updated on September 21, 2026 and Echo on June 1, 2026.

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