Comparison

TD Snap® vs SAILS

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

SAILS

This app helps children improve their speech clarity by listening to and identifying correctly articulated sounds. It offers interactive modules based on scientific research, showing accelerated progress in speech therapy when used alongside traditional programs. Available in multiple English dialects and French, with a free introductory module.

Highlights
  • Auditory discrimination of speech sounds
  • Interactive learning modules
  • Research-backed progress acceleration
  • Multiple language dialects
  • Free introductory module
Features
Read full description

The Speech Assessment and Interactive Learning System (SAILS) is an app-based tool for presenting children with recordings of other children's speech. The recordings represent children's efforts to perceive difficult sounds, some articulated correctly, some misarticulated. The child's task is to determine if each auditory stimulus is a correctly articulated variant of the target word. Four published studies have shown that a child's rate of progress in speech therapy will be double the usual rate if the program is included as part of a typical speech therapy program. SAILS is available in North-American English (8 speech sounds can be tested and trained across 21 modules) and Australian English (5 speech sounds can be tested and trained across 10 modules). You can try SAILS with the CAT module that is free in each language. One module (GRIS) is available for free in French. Project initiated and directed by Susan Rvachew Software development by Alexandre Herbay Australian speech sounds development by Stephanie Hearnshaw More information at www.dialspeech.com

Verdict

The call

The clearest difference is rating: TD Snap® at 4.1 against SAILS's 3.0. TD Snap® also leads on ratings volume (856 vs 1) and update cadence (every 2 months vs every 5 months). SAILS's advantage is monetization model (free with in-app purchases vs subscription) and iOS requirement (11.0 vs 13.0). On price, review sentiment, ads and in-app purchases 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 and SAILS sells 22 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

TD Snap® holds the better App Store score, 4.1 against 3.0. That said, the two scores are not equally well evidenced: TD Snap® has 856 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 31% of TD Snap®'s written reviews are positive against 33% of SAILS's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

TD Snap® ships an update every 2 months, SAILS every 5 months. The most recent releases landed on October 13, 2026 and September 30, 2026 respectively.

Scorecard5 real differences · 5 level
TD Snap® versus SAILS: the parameters behind the verdict, then further details
ParameterTD Snap®SAILS
PriceFreeFree
Rating4.1 (856 ratings) — better3.0 (1 ratings)
Positive reviews30.7% of reviews33.3% of reviews — better
Number of ratings856 — better1
Update frequencyEvery 2 months — betterEvery 5 months
AdsNoNo
In-app purchasesYesYes
MonetizationSubscriptionFree with in-app purchases — better
DevicesiPadiPad
Requires iOS13.011.0 — better
Further details — not scored
Size3.4 GB89 MB
Age rating4+4+
DeveloperTobii Dynavox LLCSusan Rvachew

Customer experience

TD Snap®

All ratings856 ratings
Positive77.1%
Neutral6.3%
Negative16.6%
Written reviews179 reviews
Positive30.7%
Neutral5.6%
Negative63.7%

SAILS

All ratings1 ratings
Positive0.0%
Neutral100.0%
Negative0.0%
Written reviews3 reviews
Positive33.3%
Neutral33.3%
Negative33.3%

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

SAILS

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
22 purchases

SAILS

One-time22
  • NAE - Sound K - Word CATFree
  • Français(Qc)- Son R - Mot GRISFree
  • NAE - Sound L - Word LAKE$1.99
Show 19 more
  • NAE - Sound R - Word RAT$1.99
  • NAE - Sound R - Word ROPE$1.99
  • NAE - Sound R - Word DOOR$1.99
  • NAE - Sound S - Word SOAP$1.99
  • NAE - Sound S - Word SUE$1.99
  • NAE - Sound S - Word BUS$1.99
  • NAE - Sound K - Word COAT$1.99
  • NAE - Sound SH - Word SHOE$1.99
  • NAE - Sound CH - Word CHIN$1.99
  • NAE - Sound L - Word LAMB$1.99
  • NAE - Sound K - Word BOOK$1.99
  • NAE - Sound TH - Word THUMB$1.99
  • NAE - Sound L - Word NAIL$1.99
  • NAE - Sound CH - Word CHAIN$1.99
  • NAE - Sound SH - Word SHEET$1.99
  • NAE - Sound TH - Word THIN$1.99
  • NAE - Sound F - Word FAT$1.99
  • NAE - Sound F - Word FEET$1.99
  • NAE - Sound F - Word KNIFE$1.99

Questions

Is TD Snap® free?
TD Snap® is free to download, with in-app purchases available.
Is SAILS free?
SAILS is free to download, with in-app purchases available.
Which has better reviews, TD Snap® or SAILS?
TD Snap® is rated higher. TD Snap® averages 4.1 out of 5 from 856 ratings, while SAILS averages 3.0 from 1 ratings.
Do TD Snap® or SAILS have ads?
Neither TD Snap® nor SAILS shows ads.
Which is updated more often, TD Snap® or SAILS?
TD Snap® ships an update every 2 months, and SAILS every 5 months. Most recently, TD Snap® was updated on October 13, 2026 and SAILS on September 30, 2026.

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