Codility vs CodeSignal_

Codility gives your engineers the full Claude Code CLI in a real VS Code environment and keeps every hiring decision with a human, on evidence they can inspect. CodeSignal hands more of the process to its own AI: an AI Interviewer that scores candidates, and agentic interviews as a single early-access question.

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Codility keeps the hiring decision with your team and makes it explainable. Every score follows criteria fixed before release and documented in a 92-page Technical Manual, and every integrity signal sits on the record for your reviewer. Assessment Scientists and solution engineers work alongside your team from rollout onward.

CodeSignal’s pitch is AI everywhere: an AI Interviewer that scores candidates itself, AI proctoring where CodeSignal’s own reviewers make the final call, and agentic coding as one early-access question in a live interview.

How Codility and CodeSignal compare

Capability	Codility	CodeSignal
Scoring	Fully deterministic scoring with full explainability. Criteria are fixed and weighted before release, and every score traces back to them	Marketed as validated by I-O psychologists. For the AI Interviewer, that means tuning the AI until its ratings match your reviewers’, so it learns to score the way your team already does, blind spots included
Task library	More than 1,300 tasks, each validated by Assessment Scientists, calibrated for difficulty and monitored for adverse impact, plus virtually unlimited custom tasks created with AI through Codility’s dedicated task creation MCP, drawing on your own codebase if you choose	Pre-built Certified Assessments by skill area
AI in the assessment	The full Claude Code CLI is available inside Screen, Interview and Skills Intelligence, preconfigured in the VS Code terminal. In Screen and Skills Intelligence you switch the AI Assistant on or off for each task, and every interaction is captured as reviewable AI activity. Where it is off, the integrity signals are designed to surface outside help	Cosmo, CodeSignal’s assistant, in a version picked per question from a preset menu, with account-level enablement through customer success
Coding agents in live interviews	The full Claude Code CLI runs in a terminal the interviewer and candidate share, on a multi-file project, with no separate account or API key. Interviewers write AI Instructions, hidden from the candidate, that the AI Copilot and Claude Code both follow, and every prompt, command and change is saved to the record and Replay	Agentic Interviewing is a single early-access question in a live interview. Switching agent clears the editor, and Cursor needs the candidate or interviewer to sign in with their own Cursor account
Who makes the hiring call	A human reviewer, on reviewable evidence. No AI or machine learning makes the automated hiring decision	An AI Interviewer runs interviews and scores candidates itself, tuned to your reviewers’ ratings
AI skills beyond engineering	AI for Business assesses real work produced with an AI assistant in business roles, scored deterministically	An AI Literacy Assessment, AI simulations and go-to-market assessments
Integrity	ID verification, behavioral monitoring, code evolution replay, secure desktop mode designed to detect invisible AI overlays, copy-paste controls and Similarity Check, plus typing pattern detection and cheating apps detection. Signals resolve into one deterministic Integrity Risk level that shows which signals contributed, route to a human reviewer and never auto-reject a candidate	A government ID check, then camera, microphone and screen recording with AI analysis and a Suspicion Score. CodeSignal’s own reviewers make the final call on flagged sessions
AI helper apps that hide from screen capture	The Codility Desktop App is designed to detect helper apps such as Cluely and InterviewCoder, which hide themselves from screen capture, and feeds the finding into the Integrity Risk level	Proctoring relies on a screen recording, and apps built to hide from screen capture do not appear in it
Live interviews	Codility Interview runs in VS Code with a terminal running the full Claude Code CLI, sidecar services, a whiteboard, a full transcript and one shared session, and stands on its own if screening is not the gap	A proprietary IDE with a Miro-powered whiteboard and interview coding replay
Integrations	80+ integrations across applicant tracking systems (ATS), human resources information systems (HRIS) and scheduling tools, with support for single sign-on (SSO) and SAML	Basic applicant tracking integrations on the Grow plan. Enterprise integrations and role-based access controls sit on the top tier
Data hosting	US and EU hosting options available	EU hosting is not documented as an option

Competitor capabilities change. Details checked against public sources.

Which is the right fit?

Choose Codility if

You need every score to follow fixed criteria, with the method documented in a 92-page Technical Manual
You want your own reviewers making the hiring call and the integrity call, on evidence they can inspect
You need integrity that reaches below the browser: the Codility Desktop App is designed to detect helper apps that hide from screen capture, and every signal resolves into one deterministic Integrity Risk level
Your loop includes an agentic round, with candidates directing the full Claude Code CLI through a multi-file project while the interviewer works in the same terminal
You want candidates measured against your own hiring standard, on tasks matched to the role or built from your codebase
You want experts in the loop: Assessment Scientists on task design and cut scores, solution engineers on rollout

Choose CodeSignal if

You are comfortable with CodeSignal’s AI and CodeSignal’s reviewers making calls about your candidates, and one early-access question covers your agentic interviews

What reviewers say on G2

Codility, 904 reviewsCodeSignal, 1,408 reviews

Ease of Setup

Codility92% 65 responses

CodeSignal81% 9 responses

User, Role, and Access Management

Codility85% 51 responses

CodeSignal79% 11 responses

Internationalization

Codility85% 33 responses

CodeSignal79% 13 responses

Quality of Support

Codility90% 101 responses

CodeSignal89% 118 responses

Integration APIs

Codility79% 37 responses

CodeSignal77% 8 responses

Source: G2 compare report, Summer 2026

Platform plus people

Enterprise customers work with a named team: Assessment Scientists and occupational psychologists on task design, cut scores and adverse impact, solution engineers on the platform, and advisory work on assessment strategy and AI best practices.

Rollouts are built around your engineering teams: solution engineers set up the tasks with them, and Assessment Scientists review the cut scores.

Agentic coding interviews

The full Claude Code CLI from Anthropic runs in the VS Code terminal of Codility Interview, preconfigured with no separate Claude account or API key. Interviewer and candidate share the terminal, and every prompt, command and code change is saved to the record and Replay.

Claude Code is available to every Codility customer, across Screen, Interview and Skills Intelligence.

Frequently asked questions

Does Codility offer an AI interviewer?

No, by design. A hiring decision delegated to a model is a decision nobody can explain afterward. Codility keeps a human accountable and gives them reviewable AI activity, a full transcript and a deterministic score to decide with.

How hands-on is Codility compared with CodeSignal?

How do Codility and CodeSignal score coding skills?

How do agentic coding interviews work in Codility compared with CodeSignal?

In Codility Interview, candidates work with the full Claude Code CLI in a VS Code terminal they share with the interviewer, on a multi-file project, with no separate account or API key. Interviewers write AI Instructions, hidden from the candidate, that the AI Copilot and Claude Code both follow, and every prompt, command and change is saved to the record and Replay. CodeSignal offers agentic interviewing as a single early-access question, where switching agent clears the editor and Cursor needs a personal Cursor sign-in.

How does Codility know whether a candidate tried to cheat?

Layered signals, and a reviewer who can see all of them in one place. Codility verifies identity with government-issued ID where you enable it, then measures what happens after: code pasted in from outside the environment, a copied task description, time away from the environment, abnormally fast completion, and a code evolution timeline that replays how the solution was built. Similarity Check compares submissions across candidates. Cheating apps detection is designed to surface helper apps that hide themselves from screen capture. When the AI Assistant is enabled, every interaction is captured as reviewable AI activity alongside the transcript.

Those signals resolve into one deterministic Integrity Risk level that shows which signals contributed. Signals route to a human reviewer and never auto-reject a candidate, and a similarity match ends in manual confirmation by design. CodeSignal checks identity and records camera, microphone and screen, and its own reviewers make the final call on flagged sessions. A screen recording cannot show helper apps built to hide from screen capture. The Codility Desktop App is designed to detect them, and your reviewer makes the call.

How do we move from CodeSignal to Codility?

See what your engineers can really do

Whether you are hiring your next engineer or understanding the team you already have, the first step is the same. Tell us what you are working on and we will show you how Codility can help you.