Scrabble Library for Dart


Scrabble provides an API and command line tool for finding and scoring legal Scrabble words defined in the SOWPODS dictionary (see

  • The API includes methods to:
    • lookup legal words, perhaps includng the wildcard '?'.
    • get all legal anagrams of a string, perhaps including the wildcard '?'.
    • get the score for a word.
  • The command line tool provides access to the API from the command line.

Installing Scrabble

  1. Depend on it

    Add this to your package's pubspec.yaml file:

       scrabble: ^0.1.0
  2. Install it

    You can install packages from the command line:

     $ dart pub get
  3. Import it

    Now in your Dart code, you can use:

     import 'package:scrabble/scrabble.dart';
  4. Install Command Line tool

    Activate the command:

     $ dart pub global activate scrabble

    If this doesn’t work, you might need to set up your path.


Command Line Example

The command line tool has many options as described in the help text, run:

$ dart run scrabble --help

This example does a lookup for three letter words including 'a', 'b' and the wildcard '?'.

$ dart run scrabble lookup --expand ab?
Lookup ab? {aba, abb, abo, abs, aby}
Score aba = 5
Score abb = 7
Score abo = 5
Score abs = 5
Score aby = 8

Dart Example

See example/example.dart

import 'package:scrabble/scrabble.dart';

void main(List<String> args) {
  final scrabble = Scrabble();
  // Lookup arguments
  for (var word in args) {
    var matches = scrabble.lookup(word, expand: true);
    printMatches(scrabble, 'Lookup', word, matches);
  // Get anagrams of arguments
  for (var word in args) {
    var matches = scrabble.anagram(word, expand: true, sort: true);
    printMatches(scrabble, 'Anagram', word, matches);

// Print matches with scores
void printMatches(
    Scrabble scrabble, String command, String word, Set<String> matches) {
  print('$command $word $matches');
  for (var match in matches) {
    print('Score $match = ${scrabble.score(match)}');

Run the example with one or more sets of letters:

$ cd example
$ dart run example.dart abc
Lookup abc {}
Anagram abc {ab, ba, bac, cab}
Score ab = 4
Score ba = 4
Score bac = 7
Score cab = 7

Web Example

See example/web/web.dart.

This is a version of the Scrabble example at, modified to use the Scrabble package.

Run the example as follows:

$ cd example
$ webdev serve web
[INFO] There was output on stdout while compiling the build script snapshot, run with `--verbose` to see it (you will ne[WARNING] Throwing away cached asset graph because the build phases have changed. This most commonly would happen as a result of adding a new dependency or updating your dependencies.
[WARNING] Throwing away cached asset graph because the language version of some package(s) changed. This would most commonly happen when updating dependencies or changing your min sdk constraint.
[INFO] Cleaning up outputs from previous builds. completed, took 614ms
[INFO] There was output on stdout while compiling the build script snapshot, run with `--verbose` to see it (you will ne[INFO] Building new asset graph completed, took 2.7s
[INFO] Checking for unexpected pre-existing outputs. completed, took 5ms
[INFO] Serving `web` on
[INFO] Generating SDK summary completed, took 8.2s
[WARNING] No actions completed for 15.0s, waiting on:
  - build_web_compilers:sdk_js on asset:build_web_compilers/$package$
  - build_web_compilers:entrypoint on web/web.dart

[INFO] Running build completed, took 42.4s
[INFO] Caching finalized dependency graph completed, took 305ms
[INFO] Succeeded after 42.7s with 879 outputs (2958 actions)
[INFO] ----------------------------------------------------------------------------------------------------------------
[INFO] Injected debugging metadata for entrypoint at http://localhost:8080/web.dart.bootstrap.js

Then open the page

Package Development

This documentation is not needed to use the package, just for its development.

The package converts the cleartext dictionary file (lib/sowpods.txt) into a compressed string buffer at package development time, using the Dart builder_runner package and the command:

dart run build_runner build

This approach was adopted to provide web client-side access to the dictionary.


An API for finding and scoring legal Scrabble words.
Compress Scrabble word file into a compressed readable string.