About

Do I Need to Log in to Play?
No. Submitted solutions will be executed and checked without logging in, but nothing will be saved and you won't appear on the leaderboards.
Is Code Golf Free as in Speech?
Yes! It is written in Go, licensed under MIT, and available on GitHub; patches welcome!
Is Code Golf Free as in Beer?

Yes! However hosting isn't, so if you enjoy Code Golf consider donating to its continued existence and improvement via GitHub Sponsors.

Sponsors will receive a shiny “Sponsor” badge on their profile and a warm fuzzy feeling in their heart.

What Languages Are Supported?

><>

570 KiB
d1b38f9
github.com/primo-ppcg/fish-jit

Bash

1.15 MiB
5.0.18
gnu.org/software/bash/

brainfuck

1.59 MiB
1.0.0
github.com/code-golf/code-golf/tree/master/langs/brainfuck/

C

1.58 MiB
Tiny C Compiler 0.9.27
bellard.org/tcc/

C#

141 MiB
C# 8.0 on .NET Core 3.1.7
docs.microsoft.com/dotnet/csharp/

COBOL

6.12 MiB
GnuCOBOL 2.2.0
gnu.org/software/gnucobol/

F#

108 MiB
F# 4.7 on .NET Core 3.1.7
fsharp.org

Fortran

410 MiB
GNU Fortran 9.3.0
gcc.gnu.org/fortran/

Go

110 MiB
1.15.5
go.dev

Haskell

332 MiB
Glasgow Haskell Compiler 8.8.4
haskell.org/ghc/

J

3.3 MiB
9.01.01
jsoftware.com

Java

67.2 MiB
14.0.2
openjdk.java.net

JavaScript

21.1 MiB
V8 8.6.395.17
v8.dev

Julia

279 MiB
1.5.3
julialang.org

Lisp

35.4 MiB
GNU CLISP 2.49.92
clisp.sourceforge.io

Lua

314 KiB
5.4.1
lua.org

Nim

22.3 MiB
1.4.0
nim-lang.org

Perl

4.04 MiB
5.32.0
perl.org

PHP

10.5 MiB
7.4.12
php.net

PowerShell

185 MiB
PowerShell 7.1.0 on .NET 5.0.0
docs.microsoft.com/powershell/scripting/overview

Python

206 MiB
3.9.0
python.org

Raku

48.7 MiB
Raku 6.d on Rakudo 2020.10
raku.org

Ruby

14.9 MiB
2.7.2
ruby-lang.org

Rust

588 MiB
1.47.0
rust-lang.org

SQL

1.02 MiB
3.33.0
sqlite.org/index.html

Swift

869 MiB
5.3.1
swift.org

Zig

216 MiB
0.7.0
ziglang.org

If you'd like to see another language added then raise an issue.

Are Warnings Ignored?
Yes. Only STDOUT is checked against the solution, STDERR is however shown back to you to ease debugging.
How Are Arguments Passed to My Program?
Some holes pass arguments, for those your program should read them from ARGV.
How Are Solutions Scored?
There are two scorings in use, bytes and chars. Bytes is the number of bytes of a solution encoded in UTF-8. Chars is the number of Unicode codepoints of a solution. Users may submit up to two solutions per hole per language. This is handled automatically when you enter two solutions and each minimizes a different scoring. Each scoring has its own set of leaderboards. For the chars scoring, both “A” (U+0041 Latin Capital Letter A) and “😉” (U+1F609 Winking Face) cost the same despite the 1:4 ratio in byte count in UTF-8.
How Is My Overall Score Computed?
For each hole, the shortest solution is awarded 1,000 points, with the points descreasing in uniform decrements per rank. Your overall score is simply the sum of your points in each hole.
Are Submissions Resource Constrained?
Yes. Execution time is limited to 7 seconds, CPU & RAM usage is unbounded but this will probably change soon. The maximum length of each solution is 400 KiB.
Is there an API?
There is a read-only API that returns scores in JSON format. The URL is /scores/all-holes/all-langs/all. Note that all-holes and all-langs may be replaced by the names of specific holes and languages.
Can I See Other People's Solutions?
No, that way all holes stay competitive. If you're stuck on how to shave a couple of bytes off your solution then why not drop by our Discord server for some advice.