This Privacy Policy describes how Dejavu English (the "Site", "App", "we", "us", or "our") collects, uses, and discloses your personal information when you visit, use our services, or make a purchase from https://dejavuenglish.com/ (the "Site"), use our mobile applications "Dejavu English" for iOS and Android, use our browser extension "Send to Dejavu Reader", or otherwise communicate with us (collectively, the "Services"). For purposes of this Privacy Policy, "you" and "your" means you as the user of the Services, whether you are a customer, mobile app user, website visitor, browser-extension user, or another individual whose information we have collected pursuant to this Privacy Policy. Please be informed that Dejavu English (https://dejavuenglish.com) is proprietary software owned and operated by Seljuk Solutions Ltd, a registered company headquartered in the United Kingdom.
This section specifically describes the data practices of the Dejavu English browser extension "Send to Dejavu Reader" (Chrome Web Store item ID hmdcfiapjlflajgoieaifmocmaelanog), and the equivalent build distributed through other browser-extension stores. It supplements, and where it conflicts with, takes precedence over the more general statements elsewhere in this Privacy Policy with respect to the extension.
The single purpose of the extension is to let an authenticated Dejavu English user save the article they are currently reading to their personal Dejavu Reader archive and, optionally, run language analysis on it (vocabulary extraction, CEFR-level assessment, definitions, translations, text-to-speech). The extension does not run in the background, does not act on pages the user has not explicitly chosen, and does not include any analytics, advertising, or third-party tracking code.
When you use the extension, the following categories of data are processed:
The extension does not collect: financial or payment information, health information, authentication information for any third-party service, personal communications (email, SMS, chat), location data, web history beyond the pages you explicitly act on, user-input form data from third-party websites, keystrokes, screenshots, or any content from pages whose URL starts with chrome://, chrome-extension://, moz-extension://, about:, or edge:// — these internal pages are explicitly excluded in code.
Data collected by the extension is used solely to provide the user-facing features described above, namely:
We do not use extension-collected data to serve advertising, to personalize advertising, for behavioural retargeting, to build user profiles outside the Dejavu English service, to train machine-learning or artificial-intelligence models for any third party, or for any purpose unrelated to the single purpose of the extension stated above. We do not sell, rent, or trade data collected by the extension.
Data is stored in two places:
All data in transit between the extension and our API is encrypted with HTTPS (TLS). Data at rest on our servers is stored within access-controlled, hosted database systems.
The extension transmits data only to our own backend API at https://api.dejavuenglish.com. The extension's host_permissions in its manifest are restricted to this single origin, and its Content Security Policy explicitly forbids connections to any other host. The extension does not include, load, or communicate with any third-party analytics provider, advertising network, error-tracking service, A/B-testing service, or behavioural-tracking pixel.
Behind our API, we rely on a small, defined set of sub-processors strictly to deliver the service:
Each sub-processor is contractually bound to process data only on our behalf and only to the extent necessary to perform its function. We will otherwise disclose extension-collected data to third parties only where (i) you have explicitly consented, (ii) we are required to do so by a binding legal obligation (such as a valid court order), or (iii) it is strictly necessary to protect the rights, safety, or property of Dejavu English, our users, or the public.
The extension requests only the browser permissions necessary to perform its single purpose:
The use and transfer of information received by the extension to and from any browser-extension store API adhere to the applicable User Data Policies of the corresponding store — including the Chrome Web Store User Data Policy and the Mozilla Add-on Policies — and to the Limited Use requirements thereof. In particular: the extension only requests permissions that are strictly necessary for its single, user-facing purpose; data collected by the extension is used only to provide or improve that user-facing purpose; data is not transferred to third parties except as needed to provide or improve user-visible features, to comply with applicable laws, or as part of an explicit user-initiated action; data is not sold, rented, or used to determine creditworthiness or for lending purposes; and data is not used for advertising, including personalized, retargeted, or interest-based advertising.
You can stop the extension from collecting any further data at any time by signing out from the popup, by removing the extension from your browser, or both. Uninstalling the extension also deletes any locally stored access token. To delete data that was previously saved to your Dejavu English account through the extension (saved articles, saved vocabulary, the account itself), use the account-management screens in the Dejavu English web application or contact us using the details in the "Contact" section at the end of this Privacy Policy.
The extension is not directed to children under 13 (or the equivalent minimum age in your jurisdiction). We do not knowingly collect personal information from children through the extension. If you believe a child has provided us with personal information through the extension, please contact us using the details in the "Contact" section so we can delete it.
This section explains how the Dejavu English mobile application on Apple iOS/iPadOS and Google Android handles device permissions, third-party Artificial Intelligence (AI) processing, subscriptions, and account deletion.
The mobile application requests device permissions strictly on an opt-in, user-initiated basis:
AI Data Sharing Summary: Before you use AI-powered writing, grammar, or mnemonic tools in the Dejavu English mobile app, we display an explicit in-app disclosure and ask for your permission. You can review or withdraw your AI data-processing permission at any time in Settings → AI Features & Data Privacy.
When you actively initiate AI or speech features, our backend API securely transmits only the minimum required learning input over HTTPS (TLS) to the following service providers acting as data processors on our behalf:
The Dejavu English mobile app does not access Apple's Identifier for Advertisers (IDFA) or Google's Advertising ID, does not embed third-party ad networks, does not track you across apps or websites owned by other companies, and does not sell your personal information.
You can permanently delete your Dejavu English account and all associated personal data at any time:
https://dejavuenglish.com/account-deletion) or email info@dejavuenglish.com
from your registered email address.To provide the Services, we collect and have collected over the past 12 months personal information about you from a variety of sources, as set out below. The information that we collect and use varies depending on how you interact with us.
In addition to the specific uses set out below, we may use information we collect about you to communicate with you, provide the Services, comply with any applicable legal obligations, enforce any applicable terms of service, and to protect or defend the Services, our rights, and the rights of our users or others.
The types of personal information we obtain about you depends on how you interact with our Site and use our Services. When we use the term "personal information", we are referring to information that identifies, relates to, describes or can be associated with you. The following sections describe the categories and specific types of personal information we collect.
Some features of the Services may require you to directly provide us with certain information about yourself. You may elect not to provide this information, but doing so may prevent you from using or accessing these features.
On our website, we automatically collect certain information about your interaction with the Site ("Usage Data") using cookies and session tokens ("Cookies") necessary for authentication, language preference persistence, security (CSRF protection), and service reliability. Usage Data may include device/browser type, network connection metadata, and IP address.
Finally, we may obtain limited information from service providers who support our Services on our behalf, such as:
Any information we obtain from third parties will be treated in accordance with this Privacy Policy.
Providing Products and Services: We use your personal information to provide you with the Services in order to perform our contract with you, including to authenticate your account, synchronize your vocabulary and study progress across Web, iOS, Android, and Browser Extension, process subscription entitlements, and send transactional notifications related to your account (such as email verification and password reset codes).
Optional Study Notifications & Updates: Where you opt in, we send study reminders or product updates, which you can disable at any time in Settings or via the unsubscribe link in emails.
Security and Fraud Prevention: We use your personal information to detect, investigate or take action regarding possible fraudulent, illegal or malicious activity. If you choose to use the Services and register an account, you are responsible for keeping your account credentials safe. We highly recommend that you do not share your username, password, or other access details with anyone else. If you believe your account has been compromised, please contact us immediately.
Communicating with You: We use your personal information to provide you with customer support and improve our Services. This is in our legitimate interests in order to be responsive to you, to provide effective services to you, and to maintain our business relationship with you.
We use Cookies on our Site to keep you signed in, remember your interface language and theme preferences, and protect your session. Most browsers automatically accept Cookies by default, but you can choose to set your browser to remove or reject Cookies through your browser controls. Please keep in mind that removing or blocking Cookies may cause authenticated website features to stop functioning properly.
In certain circumstances, we may disclose your personal information to third parties for legitimate purposes subject to this Privacy Policy. Such circumstances may include:
We do not sell your personal information and we do not use or disclose sensitive personal information for the purposes of inferring characteristics about you.
Your vocabulary notebooks, personal notes, attached images, and study archives are private to your account by default. If you choose to submit feedback or comments to any public area of the Services (such as blog comments), that content may be viewable by others.
Our Site and App may provide links to external websites or articles you choose to read (for example, news sources or dictionary references). If you follow links to sites not affiliated or controlled by us, you should review their privacy and security policies. We are not responsible for the privacy or security practices of third-party websites.
The Services are not directed to children under 13 (or under 16 where applicable under UK/EU data protection law), and we do not knowingly collect personal information from children. If you are the parent or guardian of a child who has provided us with their personal information, please contact us using the contact details set out below so we can promptly delete it.
All communication between our Web, Mobile App, Browser Extension, and API is encrypted in transit using HTTPS (TLS), and passwords are stored solely as salted one-way cryptographic hashes. On mobile devices, authentication tokens are stored inside hardware-backed encrypted storage (iOS Keychain / Android Encrypted Keystore).
We retain your personal learning data for as long as you maintain an active Dejavu English account. When you delete your account in the mobile app or via https://dejavuenglish.com/account-deletion, your personal profile and learning data are permanently deleted from our active database, subject only to de-identified system logs and statutory tax/accounting retention obligations.
Depending on where you live (including under the UK GDPR, EU GDPR, and applicable US state privacy laws), you may have some or all of the rights listed below in relation to your personal information:
We will not discriminate against you for exercising any of these rights. We may verify your identity (for example, via your registered email address or account password) before fulfilling a request, and we respond within the timeframes required by applicable law.
If you have complaints about how we process your personal information, please contact us using the details below. Depending on where you live, you also have the right to lodge a complaint with your local data protection supervisory authority (such as the Information Commissioner's Office (ICO) in the United Kingdom).
Please note that we may transfer, store, and process your personal information outside the country you live in, including in the United Kingdom, the European Economic Area, and the United States (where certain cloud or AI sub-processors operate). Where personal data is transferred outside the UK or EEA, we rely on recognized legal transfer safeguards such as the UK International Data Transfer Addendum and the European Commission's Standard Contractual Clauses.
Should you have any questions about our privacy practices or this Privacy Policy, or if you would like to exercise any of your rights:
For the purpose of applicable data protection laws, Seljuk Solutions Ltd (United Kingdom) is the data controller of your personal information.