Codility vs TestGorilla_

Codility assesses engineers in a real VS Code environment, with multi-file projects, the full Claude Code CLI and live technical interviews. TestGorilla sells a broad test library, most of its programming tests are multiple choice, and it runs no live technical interviews.

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Codility goes deepest on engineering. Candidates build in a real coding environment, on multi-file projects with a terminal, tests and the full Claude Code CLI, and more than 1,300 tasks are validated by Assessment Scientists and monitored for adverse impact at measured cut scores. A human stays accountable for every decision, with reviewable AI activity in front of them.

TestGorilla’s pitch is breadth: more than 350 tests for every role. Its own comparison page sends buyers who need deeper coding challenges to HackerRank, Codility and CodeSignal.

How Codility and TestGorilla compare

Capability	Codility	TestGorilla
Scoring	Fully deterministic scoring with full explainability. Criteria are fixed and weighted before release, and every score traces back to them	Code-running tests score the share of hidden test cases passed, and a runtime error or failed compile scores 0%. AI interviews and simulations are AI-scored from 0 to 5 per criterion
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	More than 350 tests across every role. Most programming tests are multiple choice, around 10 minutes each, and custom coding tests sit on the Plus plan
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	An AI assistant for candidates is not documented. Its honesty policy bars AI use unless the employer allows it, and known AI browser agents are blocked
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	TestGorilla runs asynchronous tests only. Its own comparison with Codility marks live peer coding as unavailable
Who makes the hiring call	A human reviewer, on reviewable evidence. No AI or machine learning makes the automated hiring decision	AI interviews score candidates from 0 to 5 per criterion from the transcript, and a failed ID check disqualifies the candidate automatically
AI skills beyond engineering	AI for Business assesses real work produced with an AI assistant in business roles, scored deterministically	AI fluency tests and an AI Readiness interview, taken under an honesty policy that bars AI use unless the employer allows it
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	Browser-level signals: webcam snapshots every 15 seconds, full-screen and tab tracking, paste detection, IP location and a three-tier behavior classification. ID verification sits on the Plus plan
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	Monitoring runs in the browser, with no desktop app. Handling of apps that hide from screen capture is not documented
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	AI interviews by avatar or audio, video questions and role-play simulations. Its engineering simulations work without the candidate writing or running code
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	Applicant tracking system (ATS) integrations and API access sit above the entry plans
Data hosting	US and EU hosting options available	Hosted on AWS in Ireland, inside the EU
Security certifications	SOC 2 Type II and ISO 27001	SOC 2 Type II and GDPR. ISO 27001 is not listed in its trust center

Competitor capabilities change. Details checked against public sources.

Which is the right fit?

Choose Codility if

You hire engineers and need them assessed in a real coding environment: multi-file projects, a terminal, tests and the full Claude Code CLI
You run live technical interviews, with interviewer and candidate in one shared VS Code session
You want an agentic round, with candidates directing Claude Code and every prompt and command on the record
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
You need a human reviewer accountable for every decision, with no integrity signal rejecting a candidate automatically
You want experts in the loop: Assessment Scientists on task design and cut scores, solution engineers on rollout

Choose TestGorilla if

You need one library for many non-engineering roles, and multiple-choice checks are enough for your technical hires

What reviewers say on G2

Codility, 901 reviewsTestGorilla, 1,411 reviews

Technical Screening

Codility92% 116 responses

TestGorilla87% 23 responses

Coding Development

Codility89% 102 responses

TestGorilla78% 6 responses

Customization

Codility88% 66 responses

TestGorilla76% 14 responses

Meets Requirements

Codility90% 197 responses

TestGorilla86% 54 responses

Ease of Use

Codility91% 198 responses

TestGorilla88% 54 responses

Likelihood to Recommend

Codility93% 234 responses

TestGorilla88% 76 responses

Has the product been a good partner in doing business?

Codility93% 76 responses

TestGorilla91% 23 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

Can Codility assess roles outside engineering?

Yes. AI for Business assesses real work produced with an AI assistant in business roles, scored deterministically, on the same platform your engineering teams use. TestGorilla tests AI fluency under an honesty policy that bars AI use unless the employer allows it.

Does Codility offer an AI interviewer?

How do Codility and TestGorilla score coding skills?

How do Codility and TestGorilla handle AI coding agents?

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. TestGorilla monitors at browser level, with webcam snapshots, tab and paste tracking and a behavior classification, and a failed ID check disqualifies the candidate automatically. The Codility Desktop App is designed to detect helper apps that hide from screen capture, and every signal routes to your reviewer.

How do we move from TestGorilla 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.