WeCantSpell.Hunspell 4.0.0

.NET 6.0 .NET Standard 2.0
dotnet add package WeCantSpell.Hunspell --version 4.0.0
NuGet\Install-Package WeCantSpell.Hunspell -Version 4.0.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="WeCantSpell.Hunspell" Version="4.0.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add WeCantSpell.Hunspell --version 4.0.0
#r "nuget: WeCantSpell.Hunspell, 4.0.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install WeCantSpell.Hunspell as a Cake Addin
#addin nuget:?package=WeCantSpell.Hunspell&version=4.0.0

// Install WeCantSpell.Hunspell as a Cake Tool
#tool nuget:?package=WeCantSpell.Hunspell&version=4.0.0

WeCantSpell: Hunspell

A port of Hunspell for .NET.


Download and install with NuGet: WeCantSpell.Hunspell

NuGet version CI


  • Reads Hunspell DIC and AFF file formats
  • Supports checking and suggesting words
  • Ported to fully managed C#
  • Can be queried concurrently
  • Confusing LGPL, GPL, MPL tri-license
  • Compatible with .NET Core and .NET Standard
  • Compatible with multiple .NET framework versions
  • Uses .NET to handle cultures and encodings


"It's complicated"

Read the license: LICENSE

This library was ported from the original Hunspell source and as a result is licensed under an MPL, LGPL, and GPL tri-license. Read the LICENSE file to be sure you can use this library.

Quick Start Example

using WeCantSpell.Hunspell;

var dictionary = WordList.CreateFromFiles(@"English (British).dic");
bool notOk = dictionary.Check("Color");
var suggestions = dictionary.Suggest("Color");
bool ok = dictionary.Check("Colour");


To know how up to date this port is, check the hunspell-origin submodule.


"Good enough I guess"

The performance of this port while not fantastic relative to the original binaries and NHunspell is definitely acceptable. If you need better performance you should check out NHunspell.

Benchmark WeCantSpell.Hunspell net6 WeCantSpell.Hunspell net48 NHunspell
Dictionary Loads /s 🥌 4 🐌 3 🐇 14
Words Checked /s 🐇 1,244,387 🐢 670,525 🐇 1,319,847
Suggest Queries / s 🐇 167 🥌 93 🐢 38

Note: Measurements taken on an AMD 5800H.

To reproduce:

dotnet run -c Release --project .\WeCantSpell.Hunspell.Benchmarking.LongRunning\WeCantSpell.Hunspell.Benchmarking.LongRunning.csproj --output ./perf-reports/
dotnet run -c Release --project .\WeCantSpell.Hunspell.Benchmarking.NHunspell\WeCantSpell.Hunspell.Benchmarking.NHunspell.csproj --output ./perf-reports/

Specialized Examples

Construct from a list:

var words = "The quick brown fox jumps over the lazy dog".Split(' ');
var dictionary = WordList.CreateFromWords(words);
bool notOk = dictionary.Check("teh");

Construct from streams:

using var dictionaryStream = File.OpenRead(@"English (British).dic");
using var affixStream = File.OpenRead(@"English (British).aff");
var dictionary = WordList.CreateFromStreams(dictionaryStream, affixStream);
bool notOk = dictionary.Check("teh");

Encoding Issues

The .NET Framework contains many encodings that can be handy when opening some dictionary or affix files that do not use a UTF8 encoding or were incorrectly given a UTF BOM. On a full framework platform this works out great but when using .NET Core or .NET Standard those encodings may be missing. If you suspect that there is an issue when loading dictionary and affix files you can check the dictionary.Affix.Warnings collection to see if there was a failure when parsing the encoding specified in the file, such as "Failed to get encoding: ISO-8859-15" or "Failed to parse line: SET ISO-8859-15". To enable these encodings, reference the System.Text.Encoding.CodePages package and then use Encoding.RegisterProvider(CodePagesEncodingProvider.Instance) to register them before loading files.

using System.Text;
using WeCantSpell.Hunspell;

class Program
    static Program() => Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);

    static void Main(string[] args)
        var dictionary = WordList.CreateFromFiles(@"encoding.dic");
        bool notOk = dictionary.Check("teh");
        var warnings = dictionary.Affix.Warnings;
Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 is compatible.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.

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Version Downloads Last updated
4.0.0 133,656 5/15/2022
3.1.2 6,933 3/24/2022
3.1.1 5,044 2/21/2022
3.1.0 1,081 2/21/2022
3.0.1 580,470 9/6/2018
2.1.0 2,273 8/23/2018
2.0.1 3,673 7/23/2018
2.0.0 9,427 7/1/2017
1.1.0 1,217 6/20/2017
1.0.0 4,336 5/30/2017

# WeCantSpell.Hunspell Changelog
All notable changes to this project will be documented in this file.
## 4.0.0 - 2022-05
- Changes library target to net6.0 and netstandard2.0
- [Fixes suggest affix performance problems](https://github.com/aarondandy/WeCantSpell.Hunspell/issues/40)
- Adds `ReadOnlySpan<char>` overloads for Check and Suggest.
- General improvements to check and suggest performance
- CancellationToken support added to Check and Suggest calls
- Allows customization of timeouts and other options for Check and Suggest calls
## 3.1.2 - 2022-03-23
- [Fixes an index out of range bug](https://github.com/aarondandy/WeCantSpell.Hunspell/issues/71)
## 3.1.1 - 2022-02-21
- [Fixes a character classification bug](https://github.com/aarondandy/WeCantSpell.Hunspell/pull/54)
- Code simplification
## 3.1.0 - 2022-02-21
- Adds a target for net461
- Applies new changes and fixes to match origin
- Project and build has been modernized for newer .NET versions.
## 3.0.1 - 2018-09-05
- Adds a target for netstandard2.0
- References System.Memory
- Removes the net35 target
- A bunch of performance improvements
- Uses System.Memory instead of older custom solution
## 2.1.0 - 2018-08-22
- Allowed more usage of comments in ICONV and OCONV
- Performs BREAK check on 2nd word break
- Now uses SubStandard affix flag
- Adds phonetic entries to the replacement list
- Restricts compound replacement to using "middle" entries
- General suggesion improvements
- Reduce number of strange ngram suggestions
- Prefer suggestions for word pairs listed in dictionary
- Reduce compound word overgeneration
## 2.0.1 - 2018-07-22
- Applied upstream fixes for dotted `I` and Turkish
- Applied upstream fixes for forbidden words
- Applied upstream changes for Hungarian
## 2.0.0 - 2017-06-30
- Replaced .NET Framework 4.6.1 and 4.5.1 with a single 4.5 build (net45).
- Reduced nuget package size.
- Improved performance.
- Removed build for PCL Profile 259 (portable-net45+win8+wpa81+wp8).
- Removed build for .NET Standard 1.1 (netstandard1.1).
- Removed or made inaccessible members and types, including `WordEntrySet` and `WordEntry`.
## 1.1.0 - 2017-06-19
- New `WordEntryDetail` type to simplify storage.
- Reduced memory usage.
- Improved performance.
- Included fixes from source up to commit 77492a4.
- Project beautification 🐝.
- Able to read affix files with a flag mode of NUMBER.
## 1.0.0 - 2017-05-30
- Initial release of the project
The format is based on [Keep a Changelog](http://keepachangelog.com/) and this project tries its best to adhere to [Semantic Versioning](http://semver.org/).