The following is a list of useful apps to facilitate learning and play.
Lookups and Study
Ultimate Lookup Utility
by Seth Lipkin (iOS)
ULU is a free multipurpose app for players in any language. It provides word list lookup, pattern matching, word judging and a game clock.
Zyzzyva (Computer, Android, iOS)
Zyzzyva is a free program used for looking up words, anagrams and advanced searches, and quizzes. Zyzzyva is a well-known word study tool and word judge program. You can use either NASPA Zyzzyva or Collins Zyzzyva.
Quackle
by Jason Katz-Brown & John O’Laughlin (Computer)
Quackle is a free program used to simulate, record, annotate and play Scrabble games. Quackle is presently the best AI player in the world and has been known to defeat experts.
Word App
by Craig Hart (Android)
This free app is useful for performing basic anagram searches.
Wordlist Pro
by Robert Andersson (Android)
This app is useful for performing basic anagram searches. The Lite version is free with ads.
Scrabble Checker
by Pisanu Chaloemrattanaporn (Android)
A simple free app for judging the validity of words during games.
SCRABBLE® Word Finder
by Merriam-Webster (Computer, Android, iOS)
Search the OSPD and find definitions.
AnyMemo
by Haowen Ning (Android)
This is a free flash card app, which can be used to study a variety of subjects including word lists.
Playing Platforms
Scrabble GO
by Scopely (Computer, Android, iOS)
This is the official free ad-supported app that allows you to play against other people online including your friends.
OMGwords
by Woogles (Computer, Android, iOS)
This is a free computer application that allows you to play against other people online.
WordBiz
by Internet Scrabble Club (Computer, Android, iOS)
This is a free computer application that allows you to play against other people online.
Classic Words Solo
by Sébastien Leclerc (Android)
This is a Scrabble clone that also offers definitions for words played.
Clocks and Other Tools
Ultimate Lookup Utility
by Seth Lipkin (iOS)
ULU is a free multipurpose app for players in any language. It provides word list lookup, pattern matching, word judging and a game clock.
Scrabble Clock
by Jonatan Strömsten (Android)
This free app can be used as a game clock.
Scrabboard Solver
by jhautot (Android)
Use your smartphone camera to take a picture of the board and this app will keep a digital record for you and suggest hints.
Scorable
by Kios (iOS)
Use your smartphone camera to take a picture of the board and this app will do the math for you.