--- title: "Using SurveyTester with Incognito Mode" description: "When testing online surveys, browser state matters more than many teams realize. Cookies, local storage, cached scripts, and login sessions can all…" url: https://www.surveytester.com/academy/en/test-surveys/using-surveytester-with-incognito-mode/ language: en type: faq audiences: ["Project Managers"] published: 2025-12-21 updated: 2026-04-10 --- # Using SurveyTester with Incognito Mode _Test Surveys · SurveyTester Academy_ ### When it’s needed, why it matters, and what to watch out for When testing online surveys, **browser state matters** more than many teams realize. Cookies, local storage, cached scripts, and login sessions can all influence how a survey behaves — sometimes in subtle, hard-to-detect ways. That’s why **SurveyTester supports running surveys in Incognito mode**. This article explains: - When Incognito mode is required - Why regular browser mode is often not sufficient - How Incognito mode actually behaves in Chrome - An important caveat about **multiple Incognito windows and shared cookies** Check out this page if you want to learn how to switch on Incognito Mode: [Enable Incognito mode](https://www.surveytester.com/academy/en/test-surveys/enable-incognito-mode) * * * ## Why the browser state is critical in survey testing Modern survey platforms (such as Qualtrics, Forsta, Confirmit, Dimensions, and others) rely heavily on browser storage for: - Respondent identification - Quota tracking - Duplicate prevention - Resume / continue logic - Fraud detection - Device and session fingerprinting During testing, this can lead to problems such as: - A survey immediately disqualifies a tester - A test run is being treated as a continuation of a previous test - Quotas appear “full” even though no real respondents have participated - Unexpected routing behavior caused by stored flags or cookies These effects often **persist across page reloads** and even across different test runs when using the same browser profile. * * * ## Why regular browser mode is often not enough Running tests in your regular browser session means: - Cookies from previous test runs are reused - LocalStorage and sessionStorage may already contain survey data - Login states (e.g., panel accounts, SSO sessions) remain active - Vendor-specific tracking data is preserved Even if you: - Clear cookies manually - Open a new tab - Use a different URL …you may still be testing with a **contaminated state**. This is especially problematic when: - Running the same survey multiple times - Testing quota logic - Testing “first-time respondent” behavior - Testing re-entry prevention - Simulating different respondents * * * ## Why Incognito mode helps Incognito mode provides a **temporary, isolated browser profile** with: - No access to your regular cookies - No access to your regular local storage - No access to cached scripts or session data - Automatic cleanup when the Incognito session ends For survey testing, this means: - Each test starts from a clean baseline - No interference from previous test runs - More realistic simulation of a first-time respondent This is why SurveyTester allows surveys to be launched **directly into an Incognito window** when required. * * * ## Typical situations where Incognito mode is recommended You should strongly consider Incognito mode when: - Testing **Qualtrics** or similar systems with aggressive cookie usage - Testing quota logic or duplicate detection - Re-running the same survey URL multiple times - Testing screening or termination logic - Switching between different test personas - Comparing behavior across multiple test runs In many teams, Incognito mode becomes the **default** for survey execution, while regular mode is used mainly for configuration or debugging. * * * ## Important: How Incognito windows actually work A common assumption is: > “Each Incognito window is completely isolated from every other Incognito window.” ## This is not correct ### The actual behavior (Chrome, Edge, Chromium) - All Incognito windows share **one single Incognito browser profile** - Cookies, localStorage, and session data **are shared across all open Incognito windows** - Data is deleted **only when the last Incognito window is closed** This explains an observation many testers make: > “A Qualtrics survey opened in a new Incognito window still seemed to recognize a previous Incognito test run.” That behavior is expected. * * * ## What this means for SurveyTester users If you want a **fully clean browser state**, you must: 1. **Close all Incognito windows** 2. Ensure no Incognito window remains open 3. Start a new Incognito session 4. Then launch the survey again Only at that point are **all Incognito cookies and storage cleared**. Opening a “fresh” Incognito window while another one is still open is **not sufficient**. * * * ## Best practice recommendations ✔ Use Incognito mode for survey execution ✔ Close all Incognito windows between logically independent test runs ✔ Especially important for: - Quota testing - Duplicate prevention testing - Screening logic - Fraud / bot-detection testing ✔ Use regular browser mode only when persistent state is desired (e.g. debugging logged-in scenarios) SurveyTester’s Incognito integration is designed to make this workflow as smooth as possible — but understanding how the browser behaves helps avoid confusing test results. * * * ## Summary - Incognito mode isolates surveys from your regular browser state - This leads to more reliable and reproducible test results - However, **Incognito windows are not isolated from each other** - All Incognito data is shared until *all* Incognito windows are closed - For a truly clean start, always close all Incognito windows before restarting a test Using Incognito mode correctly is one of the simplest ways to significantly improve survey testing quality — and avoid hours of debugging caused by invisible browser state.