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Does Codility Detect Tab Switching? Proctoring, Plagiarism, and Webcam Rules
Learn what Codility detects when you switch tabs, paste code, use a webcam, or share your screen, and how employers review integrity flags.
Updated August 22, 2026.
You are halfway through a Codility assessment when a notification appears. You click away for a second, return to the coding editor, and immediately wonder: did Codility record that tab switch, and can one accidental exit cost you the interview?
The direct answer is yes, Codility can track when its test tab loses focus. But that does not mean every Codility test records your screen or webcam, and it does not mean one tab switch automatically proves cheating. Employers choose which optional proctoring features to enable, and Codility tells candidates about enabled monitoring before the assessment begins.
This guide separates the signals Codility can collect from the conclusions a recruiter may draw. For the scoring side of the platform, read the Codility assessment guide.
Quick answer: Does Codility detect tab switching?
Yes. Codility's official proctoring documentation says its behavioral-events system can monitor whether a candidate navigates away from the Codility browser tab. Candidate reports can also show periods when the coding environment was out of focus and mark text pasted into the editor.
However, Codility proctoring is disabled by default and configured by the hiring team for each test. A company may enable only behavioral events, add webcam snapshots, record the screen, record camera and audio, require photo-ID verification, or use none of those optional features.
| Activity or feature | Can Codility capture it? | Is it universal? |
|---|---|---|
| Leaving the test tab | Yes, as an out-of-focus or tab-switch event | No; the report depends on enabled integrity settings |
| Pasting into the editor | Yes, with a timestamp and pasted-code context | Common integrity signal, but employer settings still matter |
| Copying the task description | Can be detected as a behavioral event | Only when the relevant signal is enabled |
| Webcam images | Yes, as snapshots or recorded video | Optional and disclosed before the test |
| Screen capture | Yes, as snapshots or continuous recording | Optional and requires screen-sharing permission |
| Photo ID and selfie | Yes, when identity verification is enabled | Optional premium feature |
What a tab switch looks like in the candidate report
Codility's candidate-report documentation shows a task timeline with a dark-blue line for time actively present in the IDE and a light-blue line for time out of focus. The report can therefore give a reviewer a play-by-play of when you were in the editor, when you left it, when code was pasted, when verification was attempted, and what the final submission looked like.
That timeline is more useful than a simple tab-switch count because it provides context. A brief focus loss after a browser notification is different from repeatedly leaving for several minutes and returning with a complete solution. Recruiters can inspect the sequence instead of treating every event as identical.
Codility explicitly warns employers that one behavioral signal is not, by itself, proof of cheating. Its guidance tells hiring teams to review the report and make an informed determination. When the evidence is unclear, Codility recommends following up with the candidate or using a live coding interview to discuss the solution.
Does Codility automatically fail you for switching tabs?
No official Codility rule says that one tab switch automatically produces a zero score or rejection. Automated coding scores are based on task correctness and, where applicable, performance. Integrity information appears alongside the technical result so the employer can decide how to interpret it.
The hiring company can still establish a stricter policy. If the invitation says that external resources are prohibited, repeated navigation away from the test may violate that company's rules even if Codility itself does not issue an automatic failure. Your invitation and the “Before You Begin” screen are the source of truth for your session.
If you leave the tab accidentally, return immediately and continue. Do not create more suspicious activity by opening several pages to investigate whether you were flagged. If a genuine technical or accessibility issue forced you to switch, write down what happened and contact the recruiter after submitting.
Does Codility record your screen?
It can, but screen recording is not present in every assessment. Codility offers screen snapshots at intervals and a video-proctoring mode that can make a continuous recording. When screen proctoring is enabled, candidates may be asked to share a browser tab, a window, or the entire screen.
The setup flow matters. Codility says candidates are notified of enabled features before proceeding, and screen sharing requires an explicit browser permission. For recording and screenshot functionality, Codility currently recommends an up-to-date supported browser and notes that Chrome is required for some recording features. Screen-sharing behavior may also require Chrome, Chromium Edge, or Opera at supported versions.
If screen capture is enabled, use one monitor unless your instructions say otherwise. Codility's screen-proctoring guidance says candidates with multiple displays should keep only one screen open. Close personal messages, password managers, financial pages, and unrelated work before sharing so private information cannot appear accidentally.
Does Codility use your webcam or microphone?
Webcam use is also employer-configured. Codility can take periodic webcam snapshots, including snapshots around proctoring events, or record camera and audio throughout the session. Codility says webcam snapshots are retained for 30 days and can be opened from the candidate report.
For recorded video proctoring, the candidate sees a disclosure and must enable audio and video before starting. A recording indicator remains visible during the assessment. Candidates may decline and return later, but they cannot proceed with a test that requires those permissions until they agree or obtain an alternative arrangement from the sponsor.
A webcam problem should be treated as a technical issue, not something to hide. Test the browser permission, camera, microphone, lighting, and network before the timer starts. If the camera cannot connect, contact the test administrator promptly rather than repeatedly restarting a timed session.
How Codility plagiarism and similarity checks work
Codility's Similarity Check compares submitted code with a database of more than 12 million assessments and with solutions found on the web. It can recognize meaningful similarity even after identifiers are renamed, formatting is changed, or small structural edits are made.
The system also compares eligible submissions with a set of AI-generated solutions. Codility says it does not use AI to decide whether code should be flagged as potentially plagiarized. Instead, its similarity process applies defined indicators and sends suspicious matches for review.
A similarity warning is not a verdict. Codility notes that simple tasks can naturally produce similar answers and that the same person may submit related code in tests for multiple employers. Recruiters are encouraged to ask the candidate to explain the solution, reasoning, and implementation choices.
Similarity checks do not cover every task type. Codility lists exceptions including project tasks, bug-fixing tasks, multiple-choice questions, essays, uploads, SQL tasks, and VS Code content. In particular, Codility says SQL answers are not checked for plagiarism because valid SQL solutions often resemble one another by coincidence.
Copy-paste tracking and code playback
A paste event appears as a marker on the task timeline, and reviewers can inspect what was inserted. Codility's own report guide cautions that pasted code does not necessarily mean cheating; some candidates work in a permitted local IDE and paste their code back into the assessment editor.
The critical question is whether that workflow was allowed. If the employer permits a local IDE, a paste may be expected. If the rules require all work inside Codility or prohibit external code, the same event carries a different meaning.
Code evolution also gives reviewers context. They can see how the solution changed over time rather than judging only the final file. Writing the code yourself, testing incrementally, and keeping a compilable version naturally creates a coherent development history you can explain later.
What employers may see after you submit
A Codility report can combine the technical score with an assessment-integrity section. Depending on enabled settings, a reviewer may see tab switches, paste events, attempted task-description copying, unusual completion time, webcam evidence, screen captures, identity and network verification, and similarity results.
Codility's newer Integrity Risk feature summarizes enabled signals as None, Low, Moderate, or High. The underlying inputs can include behavioral activity, identity and network verification, and plagiarism checks. Codility says disabled signals are excluded, so the label does not imply that every possible monitoring method was used.
The product documentation consistently treats these items as review signals. Recruiters can inspect the evidence, acknowledge or resolve similarity warnings, and follow up with a candidate. A careful hiring team should evaluate the whole session rather than converting one ambiguous event into a character judgment.
What about hidden AI interview tools?
In 2026, Codility introduced Device Integrity in public preview. When an employer enables it, the candidate completes the assessment in the Codility App for macOS or Windows. The app can identify known hidden cheating tools that may not appear in ordinary screen sharing.
Codility says the app checks for the presence of known cheating tools and surfaces detections in the integrity report. Its interview documentation also says Device Integrity does not itself record the screen, monitor keystrokes, or collect additional personal data beyond the standard session. Screen or video recording remains a separate feature.
The practical rule is simple: do not use an unapproved live-answer copilot. If AI is explicitly allowed, follow the permitted workflow and be ready to defend every line. If the invitation is silent, ask the recruiter instead of assuming that a tool is allowed because it is technically accessible.
How to take a Codility assessment without unnecessary flags
Your goal is not to manufacture a perfect-looking activity log. It is to remove avoidable distractions so normal, independent problem solving is easy to recognize.
| When | Action | Why it helps |
|---|---|---|
| Day 1 | Read the invitation, allowed-resource policy, and monitoring disclosure. | Prevents guessing about IDE, notes, AI, or internet use. |
| Day 2 | Open Codility's demo environment and verify the language version. | Reduces navigation and setup mistakes during the assessment. |
| Day 4 | Test camera, microphone, browser permissions, and screen sharing if required. | Finds technical failures before the timer starts. |
| Day 5 | Close messaging, remote access, overlays, and unapproved AI tools. | Protects privacy and avoids accidental integrity signals. |
| Day 6 | Run a full simulation and leave five minutes for final tests. | Creates a realistic submission rhythm. |
| Day 7 | Confirm the room, one-screen setup, charger, network, and support contact. | Keeps test day calm and recoverable. |
If you need an accommodation, use Codility's option to inform the test sponsor before beginning. Codility supports accessibility requests and lets employers adjust the session or arrange another interview format. Asking early is more useful than trying to force an unsuitable proctored setup.
Frequently asked questions
Can Codility see when I change tabs?
Yes, when the relevant behavioral monitoring is enabled. The candidate report can show time when the Codility IDE was out of focus. The assessment intro should disclose which behaviors the hiring team will receive.
Does one tab switch mean I cheated?
No. Codility tells reviewers that one behavioral event alone is not proof of cheating. The employer can examine duration, repetition, pasted content, screen evidence, and the rest of the session before deciding what happened.
Does Codility always record your screen?
No. Screen snapshots and continuous screen recording are optional proctoring features. If enabled, Codility asks for screen-sharing permission and shows a disclosure before the assessment begins.
Does every Codility test require a webcam?
No. Webcam snapshots and video recording are employer-configured. When required, the setup page requests camera and, for video proctoring, microphone access.
Can Codility detect copy and paste?
Yes. Paste events can appear on the candidate timeline, and recruiters can inspect the inserted code. A paste is not automatically cheating; whether it violates the rules depends on the assessment's permitted tools.
Can Codility detect ChatGPT or AI-generated code?
Codility can compare eligible submissions with AI-generated solutions and flag similarity for review. Its optional Device Integrity feature can also detect certain hidden cheating tools. Neither capability means every AI-like solution is automatically rejected.
What should I do if proctoring fails?
Stop troubleshooting loops that consume the test window. Record the exact error if permitted, contact Codility support or the recruiter, and explain the time and permission that failed. If you need an accommodation, notify the sponsor before starting.
Final takeaway
Codility can detect tab switching, copy-paste behavior, and other integrity signals, but the employer controls which optional monitoring features are enabled. Screen recording, webcam capture, audio, identity checks, and Device Integrity are separate capabilities, not universal defaults.
Read the disclosure, use only approved resources, minimize distractions, and document genuine technical problems. Then focus on the part you control: solving the problem correctly and explaining your reasoning.
Sources and Further Reading
- Codility: Proctoring and Behavioral Events Detection
- Codility: Reading a Candidate Test Report
- Codility: Similarity Check and What to Do
- Codility: Plagiarism Prevention and Fraud Detection
- Codility: Video Proctoring
- Codility: Supported Browsers and Devices
- Codility: Introducing Device Integrity
- Codility: Are SQL Solutions Checked for Plagiarism?
Research note: This guide was checked on August 22, 2026. Codility features and employer policies can change; the disclosure and instructions attached to your assessment are authoritative.