BootSelf
Check my readiness
Online compiler

Write code. Run it. Get it reviewed.

38 languages, nothing to install. Sign in and a live reviewer reads your code as you type: a note on the line and a hint, never the fix.

11 languages run today Live review: 5 a day free
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Most used

Interviews, backends and first languages
Py
Python
Online Python compiler · main.py
Jv
Java
Online Java compiler · Main.java
JS
JavaScript
Online JavaScript compiler · main.js
C++
C++
Online C++ compiler · main.cpp
C
C
Online C compiler · main.c
C#
C#
Online C# compiler · Program.cs

Web

Browsers, servers and the glue between
</>
HTML, CSS & JS
Online HTML, CSS & JS compiler · index.html
TS
TypeScript
Online TypeScript compiler · main.ts
php
PHP
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Rb
Ruby
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Systems and backend

Fast services and tools
Go
Go
Online Go compiler · main.go
Rs
Rust
Online Rust compiler · main.rs
Kt
Kotlin
Online Kotlin compiler · Main.kt
Sc
Scala
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Sw
Swift
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Dt
Dart
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Data and scripting

Queries, analysis and automation
SQL
SQL (SQLite)
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R
R
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$_
Bash
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Pl
Perl
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Lua
Lua
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Oct
Octave
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Functional

Different ways to think about code
λ
Haskell
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Ex
Elixir
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Erl
Erlang
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Clj
Clojure
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F#
F#
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ML
OCaml
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( )
Common Lisp
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:-
Prolog
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Classic and more

Where much of computing started
Gy
Groovy
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ObjC
Objective-C
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D
D
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F90
Fortran
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Pas
Pascal
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CBL
COBOL
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VB
Visual Basic .NET
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asm
Assembly (NASM)
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