Privacy policy

In short

Comparr is a product comparison service. You do not need to create an account and we never ask for your identity to browse the site. We measure traffic, we know which offers are clicked, and that is about it. We do not sell data.

Data controller

The data controller is the site publisher, identified on the Legal notice page. For any question or to exercise your rights: hello@comparr.fr.

Data collected and purposes

1. Audience measurement

We use Google Analytics 4 to understand which pages are viewed and how the site is used. We process: page views, traffic source (search engine, AI assistant, direct link), device and browser type, and a measurement identifier stored in a cookie.

• Legal basis : legitimate interest in measuring and improving the service.
• Recipient : Google LLC.
• Retention : up to 14 months.

2. Clicks on retailer offers

When you click "View offer", we record the event to understand which offers interest visitors and to detect automated traffic. We process: the offer clicked, the date, country and region inferred from the IP address, the referring page and the browser user-agent.

• The IP address is not stored in plain text: it is used only to infer approximate location (country / region), then discarded.
• Legal basis : legitimate interest (activity measurement, click-fraud prevention).
• Retention : 25 months.

3. Feedback form and product suggestions

If you write to us via the "Help us improve" widget or suggest a product, we keep your message, the page concerned and — only if you provide it, this is optional — your email address, to reply to you. Your IP address is kept temporarily to limit spam.

• Legal basis : your consent (voluntary form submission).
• Retention : 24 months, or until you request deletion.

4. Searches

Queries entered in the search bar are saved and become public comparison pages. They are not linked to any visitor: do not enter personal information.

5. Price alerts and deal emails

If you request a price alert or subscribe to deal emails, we keep your email address, what you asked for, the sign-up and confirmation dates, and your IP address (to limit abuse). No deal email is sent to you until you click the confirmation link, and every message contains a one-click unsubscribe link that deletes your address. Emails are delivered by Brevo (France).

• Legal basis : your consent, confirmed by the click received at your address.
• Retention : until you unsubscribe; 7 days for a sign-up that is never confirmed.

6. API and MCP connector (AI assistants)

When an AI assistant (Claude, ChatGPT…) queries Comparr through our API or MCP server, we process the request itself (the tool or API endpoint called, the response and its processing time), the user agent and the Signature-Agent header to recognize the assistant, and the text of a search when it starts a new comparison, which then becomes a public page, like a search made on the site. We receive neither your identity nor your conversation with the assistant, only the parameters it sends us.

• The IP address is never stored in clear: a truncated fingerprint is used to count the daily quota and expires by the next day at the latest, and a pseudonymous measurement ID, recomputed every day (so two days cannot be linked), is used to count distinct connector clients and is sent to Google Analytics with these parameters.
• Legal basis : our legitimate interest in providing the service, protecting it from abuse and measuring its use.
• Retention : quota counters: until the next day; API usage statistics: 8 days; MCP connector usage statistics (daily pseudonymous ID): 13 months; Google Analytics: 14 months.

7. Rating the products you looked at

When you click an offer, your browser remembers the offer and the date (local storage, key comparr_offer_views) — this record stays in your browser. A week later, if you come back to the site, we ask you once whether you bought the product and, if so, how you would rate it. We then receive the offer concerned and the click date (to display the question), followed by your answer if you give one — rating and optional comment — with no IP address, e-mail or identifier. These answers are not published: they are used to improve our comparisons. The “Don't ask me again” link erases this data from your browser and stops the requests.

• Legal basis : our legitimate interest in improving the catalog; answering is optional.
• Retention : at most 45 days in your browser; 24 months for the answers.

Cookies

You can refuse or delete cookies in your browser settings, and enable the Do Not Track signal. The site remains fully usable without them.

Affiliate links

Some retailer links are affiliate links (including Amazon Associates): if you buy, we earn a commission, at no extra cost to you and with no effect on our rankings. These links add a tracking identifier so the retailer can attribute the sale to Comparr. Once on the retailer's site, their own privacy policy applies.

Sub-processors and hosting

The site is hosted by Railway Corp. (United States). We use technical providers for product analysis and price collection (Google Gemini, price aggregation services): no personal data is sent to them — only product names and queries. Cross-border transfers are governed by standard contractual clauses where applicable.

Your rights

Depending on applicable law, you may have rights of access, correction, deletion, restriction, objection and portability. Email hello@comparr.fr: we respond within 30 days. California residents may have additional rights under the CCPA.