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Privacy policy

Last updated: 27 October 2026

Who we are

Clairsmith is published by Clément Dehon, sole trader (EI), 25 rue Mozart, 59430 Dunkerque, France (see the legal notice). For any question about your data: hello@clairsmith.app.

The principle: what you enter stays with you

Clairsmith's tools (day rate calculator, quote and invoice generators, Factur-X export, Factur-X invoice reader, late payment penalty calculator, reminder letters) run entirely in your browser. The information you enter and the files you open in these tools are sent neither to Clairsmith nor to any third party. There is one exception, at your request: checking a client's SIREN, described below.

Clairsmith keeps nothing you type: there is no account and no database of your invoices or your clients. The Factur-X file is built in your browser; it does not go through our servers and is not stored there.

On-device memory (local storage)

The invoice and quote generators can remember your details so you do not type them again: your seller details (name, address, SIREN, VAT number, VAT scheme, payment terms), your client book (name, address, SIREN, VAT number), your frequent services (description, price, VAT rate), the last number downloaded in each series, a copy of your last invoice, and a few counters (number of downloads, date of the last backup).

  • Where: only in this browser's local storage, on this device (key “clairsmith.atelier.v1”).
  • This data goes neither to Clairsmith nor to anyone else: we have no access to it and cannot recover it for you.
  • When: only if you tick the “Remember my details on this device” box (unticked by default) before downloading the invoice or quote (PDF or Factur-X). While details are remembered the box stays ticked; unticking it offers to erase them.
  • How to erase it: the “Erase my data from this device” button, or “Erase everything” in “My data”; clearing this site's data in your browser erases it too.
  • Backup: “Download a backup” saves a .json file that you keep yourself; you can import it in another browser. Without a backup, clearing your browser loses this data.

The “Mention Clairsmith in the footer” box is not remembered: it is ticked by default on every visit (you can untick it).

When you move from one page to another (“Create my invoice” from the home page, “Turn into an invoice”, “Generate the reminder letter”), the information is passed through your browser's session storage, erased as soon as it is read or when you close the tab.

The opening animation of the home page and of the product pages plays only once per session: a simple flag (keys “clairsmith.forge.accueil” and “clairsmith.forge.piece”, value “1”) is saved in this browser's session storage. It contains nothing you type, is sent to no one and disappears when you close the tab.

SIREN check

In the invoice and quote generators, the “Check and fill” button looks up the official name and address of a French client. When you click it, only the SIREN typed in the client field is sent, directly by your browser, to the French government's public “Recherche d'entreprises” API (Annuaire des entreprises, recherche-entreprises.api.gouv.fr). The request does not go through Clairsmith, which neither receives it nor keeps any trace of it. As with any connection, that government service sees your IP address, your browser type and the site the request comes from. Nothing else you typed leaves your browser: neither your own details nor the rest of the invoice. If you never click the button, no request is sent.

Audience measurement

To understand how the site is used, Clairsmith uses Cloudflare Web Analytics, the audience-measurement tool provided by its host. It produces aggregated, anonymous statistics: pages viewed, referring site, country, device and browser type, and page-load performance. According to Cloudflare, this tool sets no cookies, uses no browser storage and does not attempt to identify you individually, including by “fingerprinting” your IP address or browser. Purpose: measuring traffic and improving the site. Legal basis: the publisher's legitimate interest (Article 6(1)(f) GDPR).

The Forge Log (Clairsmith's newsletter)

If you subscribe to the Forge Log, we collect your email address.

  • Purpose: sending you the Forge Log (regulatory deadlines, new or updated tools, tool tests, behind the scenes), sending you the e-invoicing checklist if you asked for it, and informing you about new tools and products (including Clairsmith Pro and the International Freelance Kit).
  • Legal basis: your consent (Article 6(1)(a) GDPR), collected through a checkbox and confirmed by a validation email (double opt-in).
  • Recipient: our email service provider, Brevo (a company established in France), acting as a processor.
  • Retention: until you unsubscribe. With no open or click for 3 years, your data is deleted.
  • Unsubscribing: in one click, through the link in every email, or on request at hello@clairsmith.app.

Purchases

When you buy a Clairsmith product, the sale is concluded with Polar (Polar Software, Inc.), which acts as the seller (Merchant of Record): it processes the payment, issues the invoice, collects the applicable tax, handles refunds and delivers the files. Polar is the data controller for the sale, under its own privacy policy. Your bank details are never passed on to us. As Polar Software, Inc. is based in the United States, your data may be transferred outside the European Union, under the safeguards described in its privacy policy.

Clairsmith receives from Polar, through an automatic notification (webhook), your name, email address, the product purchased, the language and the date of the purchase, and records in Brevo your email address, the product, the language and the date to provide support and send you the emails related to your purchase. Clairsmith is the controller of the data it records in Brevo. We do not keep your name; the billing country, if provided, is only used to determine the language. A purchase does not subscribe you to the newsletter.

To prove that you requested immediate access and waived your right of withdrawal (Article 6 of the terms of sale), Clairsmith also records in Brevo your answer to that box, its date and the order number, then confirms them to you by email. These three items are kept for 5 years after the purchase.

If you use the withdrawal form, your name, order number and email address are emailed, through our sending provider Brevo, to you (acknowledgement of receipt) and to Clairsmith. They are used only to handle your statement; that message is kept for 5 years as proof (the general limitation period, Article 2224 of the French Civil Code). Legal basis: sending the acknowledgement meets a legal obligation (Article 6.1.c GDPR; Article L221-21 of the French Consumer Code); keeping the message as proof rests on our legitimate interest in establishing that you exercised your right (Article 6.1.f).

  • Purpose: provide support and purchase-related emails (delivery, confirmation, help, refund); keep proof of the waiver of the right of withdrawal.
  • Legal basis: performance of the contract (Article 6(1)(b) GDPR); for the proof, our legitimate interest in being able to establish your consent (Article 6(1)(f)).
  • Retention: 3 years from your last purchase, then deletion; 5 years after the purchase for the proof of waiver. Billing data is kept by Polar.
  • Recipient: Brevo (a company established in France), acting as processor.

Clicking an affiliate link takes you to the partner's website, which applies its own privacy policy and may set cookies to credit the referral. Clairsmith adds no tracking script or pixel and passes no data about you; your browser does tell the partner which site you came from. Partners to date: Indy, Tiime, Abby, Shine, Pennylane, LegalPlace. Links to Tiime and Abby go through the affiliate platform Affilae (lb.affilae.com), which receives your visit before redirecting you and may set its own cookies. On the French invoice generator, a partner block can be hidden: that choice, which only records that you hid the block, is saved only in the local storage of this browser (key “clairsmith.encart.indy.masque”), it is sent neither to Clairsmith nor to the partner, and you erase it by clearing the site data in your browser. See our partners.

Cookies

The site sets no cookies, whether for audience measurement, advertising or tracking. No consent banner is therefore shown.

Hosting and security

The site is hosted by Cloudflare, Inc., which processes the technical data strictly needed to display the pages and to protect against attacks (IP address, requests). See Cloudflare's privacy policy: https://www.cloudflare.com/privacypolicy/

Your rights

You have the rights provided under the GDPR: access, rectification, erasure, objection, restriction, portability, and withdrawal of your consent at any time. To exercise them: hello@clairsmith.app. You can also lodge a complaint with the French data protection authority (CNIL, www.cnil.fr).

Changes to this policy

This page is updated whenever the site changes in a way that affects personal data. The last-updated date appears at the top of the page.