Pearson TELL vs TD Snap®
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Pearson TELL
This app offers a self-administered online language proficiency assessment for K-12 students. It includes various tests to monitor progress and provide schools with insights into students' language skills, informing instructional decisions. Results are available quickly thanks to innovative speech and writing evaluation technology.
- K-12 language proficiency assessment
- Screener, diagnostic, and progress monitoring tests
- Measures listening, reading, writing, and speaking skills
- Innovative speech and writing evaluation technology
- Fast, reliable scored results
- Detailed reporting for schools and districts
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Pearson’s TELL is a self-delivered online language proficiency assessment for students in grades K-12. TELL consists of a single screener, two diagnostic, and eight progress monitoring assessments that are administered throughout the course of an academic school year. The results from TELL provide schools and districts with a complete understanding of their students’ current language proficiency and allows them to measure their progression. This robust reporting that also helps inform instructional decisions. With minimal set-up time, students can begin testing. During test administration, students watch video clips and interact with pictures and words on a tablet, then answer questions out loud. They listen, write, read, and speak—all with no mark-ups or grading by teachers. Short, effective testing allows users to monitor student progress on the development of core English language skills necessary for learning academic content. TELL’s unique items types allow for measuring multiple skills in a single item. TELL’s innovative speech recognition and writing evaluation technology yields highly reliable scored but also means that results are available in minutes! TELL scores are provided at the Overall level, for the four foundational skills (listening, reading, writing and speaking), and for the following sub-skills : pronunciation, fluency, grammar, vocabulary, reading comprehension, reading rate, expressiveness, and pre-literacy.
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.
- 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
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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.
Verdict
The clearest difference is review sentiment: Pearson TELL at 100% against TD Snap®'s 31%. Pearson TELL also leads on rating (4.7 vs 4.1) and in-app purchases (none vs 10). TD Snap®'s advantage is ratings volume (873 vs 3). On price, update cadence, 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
Both are free to download. TD Snap® sells 10 in-app purchases, starting at $4.99 per month. Pearson TELL asks for nothing beyond the download.
Pearson TELL holds the better App Store score, 4.7 against 4.1. That said, the two scores are not equally well evidenced: TD Snap® has 873 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 100% of Pearson TELL's written reviews are positive against 31% of TD Snap®'s.
Pearson TELL ships an update every 3 months, TD Snap® every 2 months. The most recent releases landed on October 29, 2026 and November 1, 2026 respectively.
| Parameter | Pearson TELL | TD Snap® |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (3 ratings) — better | 4.1 (873 ratings) |
| Positive reviews | 100.0% of reviews — better | 30.7% of reviews |
| Number of ratings | 3 | 873 — better |
| Update frequency | Every 3 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Subscription |
| Devices | iPad | iPad |
| Requires iOS | 11.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 12 MB | 3.4 GB |
| Age rating | 4+ | 4+ |
| Developer | Pearson Education, Inc. | Tobii Dynavox LLC |
Customer experience
Pearson TELL
TD Snap®
Bugs and requests
Pearson TELL
Not enough reviews yet to summarise bugs or 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
In-app purchases
Pearson TELL
No in-app purchases
TD Snap®
- Gateway Monthly1 Month trial$4.991 Month
- PODD Monthly1 Month trial$4.991 Month
- Metacom Monthly1 Month trial$4.991 Month
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- Speaking Upgrade Monthly1 Month trial$9.991 Month
- Acapela Voices$39.99
- Nuance Voices$39.99
- Speaking Upgrade$49.99
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- METACOM Symbols$49.99
- PODD Page Sets$149.99
- Gateway Page Sets$149.99









