This ASL Dictionary from the National Technical Institute for the Deaf is a modified version of their popular ASL Video Dictionary and Inflection Guide -- DIG. The program shows 2,700 signs and 650 sentences that demonstrate how signs change, or “inflect”, to convey different meanings. For example, modifications in hand movements and facial expressions can change the sign for “help” to mean help me, help them, help for a long time, etc. “Afternoon” can change to mean all afternoon, late afternoon or every afternoon. The sentences also show the full range of ASL grammar.

There is an option to show signs grouped into 24 categories: Countries, Animals, Numbers, States, Money, etc. As a self-test, users also have an option to choose when they see the English sentences – simultaneously with the ASL sentences, or afterwards.

What’s New

Version 2.1.1

remove "Rolls Royce" from the Bath category
bug fixes

Ratings and Reviews

4.1 out of 5
32 Ratings

32 Ratings

SilverHairM ,

The closest thing to a "Sign-to-English" dictionary!

This is my favorite sign lanuage app for many reasons, but the main reason I keep coming back to it, is it's one unique feature - it shows similar signs.

Why is this so awesome? How many times have you seen a sign you don't know - but unlike a written language - there is no way to look the definition of a sign up! Instead, you have to keep bothering your poor friends to death for definitions all the time. lol

So when I see a sign I don't know, now I can think of a sign that looks similar, look up that sign, and then drill down to the "similar" signs. Bam! I have found the definitions to so many signs this way! Just a bit ago, I was able to find the the sign for "appoint", by looking up a similar sign "find", which looks a bit like it.

My recommendation to the Developers: Keep developing this part of your app, because there is nothing else out there like it! But it is still in the infancy faze. Mnay similarities still need to be added. For instance, under the sign for goal, you could put the similar sign "stars", and visa-versa. If you fully develop the similar sign feature, you will have created the closest thing to a Sign-to-English dictionary ever made possible.

EasyasASL ,

Great Study Aid

This app has been incredibly helpful for studying ASL. It may not have as many definitions as a few other apps, but I still use it the most because of its great features and interface. It provides similar definitions, you can slow down and/or loop videos, there are example sentences, grammar help, and more.

By far my favorite feature is that in the options you can download all the videos (under 200mb) for offline use without an Wifi/cell connection. So you can study on a plane ride, while camping, or if you have an iPod touch and you're not near wifi.

Sign language for life ,

Best ASL app!

This is one of the best ASL apps I've ever purchased! I refer to this app more than any other ASL app I have on my phone or iPad. I've rely on this app to give me the accurate ASL sign for words I'm trying to learn. Also, it provides written English sentences translated in ASL with choices to see English, ASL or both at the same time. You can view videos at normal speed or slower. There's information on ASL grammar to you understand the proper word or when signing in ASL. This is the app for anyone who is serious about learning ASL! Love this app!!! 👍🏽👍🏽


Rochester Institute of Technology
7.2 MB

Requires iOS 6.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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