Real-Time Collaborative Code Editor for Interviews

Run a technical interview or a live coding session from a single link: a shared editor and code execution in 11 languages. No sign-up needed to start.

Without an account and with one

FeatureWithout an accountAfter signing in — free
A session behind one link, up to 5 people in one editor. The link is short enough to type by handYesYes
Run code in 11 languages, with program input (stdin) — everyone sees the outputYesYes
Write the task in Markdown right in the sessionYesYes
A bank of 2234 tasks with hidden tests: open one in a session, no account neededYesYes
Bank tasks marked «Any language»: starter and tests in Python, JavaScript, TypeScript, Java or GoYesYes
Practice: 2234 tasks with tests and hints, collections for interviews and by topic, a plan for the topics where you got stuck, progress with no accountYesYes
Complexity estimate (big O) of a solution: time and memory, for part of the bank tasks in Python and JS/TSYesYes
Practice: a level in each topic (Novice, Advanced, Expert), counted from tasks solved without hints or «I give up»NoYes
Your own tasks, stars and copies of bank tasksNoYes
Interview mode: a playlist of timed tasks you can change mid-interviewNoYes
Interview templates — saved playlistsNoYes
Candidate scoring: your own criteria, stars and a verdictNoYes
Private notes — only you see themNoYes
Interview history: code, whiteboard and scoresNoYes
Interview recording: replay how the code was writtenNoYes
A whiteboard for the interviewerNoYes
Activity monitoring — optional, 3 sessions a month plus one per answered cheating question*NoYes

Without signing in, a session doesn't reach your history: after it ends you can copy the code, or sign in within 7 days on this device.

* Notices switches to another tab, window or app, copying and pasting text from outside, screenshot shortcuts, a small browser window (another one may be open beside it) and sharp window resizes — but not every method. The candidate sees a notice and agrees; the interviewer sees the events during the session, then a summary in the history and marks in the recording. An event is a reason to ask, not proof of cheating. A free account turns monitoring on in 3 sessions a month, plus one more for each monitored session whose evaluation answers the cheating question (any answer, “Unsure” too).

The interviewer writes the task and sees the candidate's code live. Both see the run and its output.
Interview mode: tasks from the bank, a timer for each; save the set as a template.
The result in your history: code for each task, scores and the final verdict.
Interview history in your account: every interview with its verdict.

Practice: from school to job interviews

2234 coding tasks with tests and hints. Pick your stage and solve in the browser. No sign-up needed to start.

Start practicingAll tasks by topic

Task Bank

CodeShare tasks with hidden tests and tasks from other interviewers. Browse them and open one in a session without signing in

Discover

Ready-made tasks by language and difficulty

Save

Add the best ones to your favorites

Reuse

Start a session from any task

Create

Share your own tasks with other interviewers

Browse Tasks →

How it works

  1. 1. Create

    Click the button and pick a mode — the session is ready in a second

  2. 2. Share

    Send the link to a candidate or colleague

  3. 3. Code

    Write code together in real time

An editor for your language

A page per language: a code sample, typical interview tasks and limitations

How to run a live coding interview onlineCollaborative code editors compared

Frequently Asked Questions

CodeShare is a free online code editor for conducting technical interviews. Multiple participants can write and edit code simultaneously in real time.

11 languages are supported: JavaScript, TypeScript, Python, Java, C++, Go, Rust, C#, Pascal, BASIC, and SQL. All languages have syntax highlighting and code execution.

Not for an interview: create a session, send the link, write and run code together. The task bank and practice are open without an account too. Signing in (free) adds your own tasks, interview mode with a playlist of tasks, notes and scores, session history, links that keep working for a day after everyone leaves, the whiteboard and activity monitoring.

Up to 5 participants can be in a single session simultaneously. Each participant sees the cursors and changes of others in real time.

Yes. Code runs in an isolated sandbox with strict resource limits — memory, CPU time, and process count are all capped. Your code cannot access the host system or other sessions.

Create a session and send the link to the candidate. Write the task right in the session or pick one from the task bank, no account needed. After signing in you can build a playlist of timed tasks and turn on activity monitoring. Write and run code together — a signed-in interviewer finds the code, notes and scores in their history afterwards.

As long as someone is in the session. A session created after signing in survives everyone leaving and server restarts: its link works for up to a day after the last visit. Without an account a session closes 5 minutes after everyone leaves. An ended session does not open again; a signed-in interviewer finds it in the history.

It is the stage of a technical interview where the candidate solves a task and writes code while the interviewer watches. In CodeShare, live coding happens online in a shared editor: you both see the code and the run output, and the candidate never signs up.

CodeShare has a bank of 2234 tasks with hidden tests, plus tasks that other interviewers share. No mandatory registration, 11 languages with real code execution, and real-time collaboration — all in the browser.