Does Antidote send my texts to a server?

It depends on the version. Antidote 12 installed on the machine processes text locally and never transmits it to Druide's servers for base correction, according to its privacy policy. Antidote Web and AI rewording, on the other hand, send the text to a server, with a transfer to Canada for personal accounts.

How much does Antidote cost for professional use?

The Personal tier, one language, starts at 59 € the first year then 48 € on renewal. The Family tier (up to 5 accounts) starts at 99 €. An offer for organizations from 5 seats exists, with a declining rate not published online.

Does Antidote suit an organization that bans external servers?

Yes, for Antidote 12's multi-seat license: Druide presents it as meeting "the requirements of organizations that ban the use of external servers", with offline operation. This guarantee doesn't extend to either Antidote Web or AI rewording, which require a connection.

What's the difference with LanguageTool or MerciApp?

For its base correction, Antidote remains installed software that doesn't depend on a server; LanguageTool and MerciApp are online services first. Antidote covers mainly French and English with rich dictionaries and guides; the other two aim more at team use and integration with messaging tools.

Antidote: our review

Antidote proofreads and offers dictionaries and language guides from software installed on your machine, with a web and mobile version on top. Published by Quebec-based Druide, its base correction never leaves the computer; its connected features do.

Data outside the EUPaid·from €59/yearFrench

Go to Antidote's website

What we take away from it

What counts in its favor

Antidote 12, installed on the machine, processes text locally: its privacy policy states texts "are never transmitted" to Druide's servers for base correction.
The multi-seat license for organizations works offline and, according to Druide, meets "the requirements of organizations that ban the use of external servers" — a common case in a legal or accounting firm.
Text reworded by the AI feature is, per the same policy, neither kept nor used to train a model.

What counts against it

As soon as you use Antidote Web or AI rewording, text leaves the machine: the privacy policy mentions a data transfer to Canada for personal accounts, without naming a third-party AI provider.
No ISO 27001 or SOC 2 certification on the pages reviewed: Druide cites the NIST Cybersecurity Framework, OWASP ASVS and PCI DSS, frameworks less demanded by public buyers or French insurers.
The purchase page now offers only an Antidote+ subscription bundling the software, web and mobile: it's no longer possible to buy a perpetual license for the installed corrector alone, unlike Druide's former sales model.

The most consistent choice in this comparison for a firm that must keep its documents on the machine, provided it rules out AI rewording and Antidote Web for any confidential text.

The facts

First paid tier: €59/year — Antidote+ Personnel, one language, 1st year (€48/year on renewal)
Data hosting: Data outside the EU · source
Categories: Proofreading and rewriting
Data verified on: 30 July 2026

What happens to your data

Is your data used to train their models?: Depends on the plan, or an option you can turn off
Subprocessors: Druide names no third-party subprocessor on the pages reviewed. For personal and family accounts, correction via Antidote Web transfers data to Canada, according to the privacy policy; organizational accounts have the text destroyed as soon as correction is done, with no such transfer documented.
Retention: Antidote Web+ keeps the text for eight hours before deletion for a personal or family account. Organizational subscriptions have the text destroyed "as soon as correction is complete." An account is automatically deleted one year after the subscription expires.

Antidote in detail

Antidote corrects spelling, grammar and style, and offers detailed dictionaries and guides on language rules. The vendor, Quebec-based Druide informatique, has sold it for several decades as software installed on the machine, before adding a web version, a mobile version and, more recently, AI rewording.

What it actually does

The corrector plugs into Word, Excel, PowerPoint, Outlook or Edge, and flags mistakes and clunky phrasing directly in the document as you type. The dictionaries go beyond word meaning: synonyms, co-occurrences, conjugation, everything stays available without leaving the editor. The English Module adds a translation of 2.8 million words and expressions for anyone switching between the two languages in the same day. For organizations with five or more seats, Druide offers a multi-seat license deployable via an MSI package or group policy, with no individual account creation.

Why it interests us in particular

It's the only corrector in this comparison that clearly separates two processing modes depending on the version. Antidote 12, the installed software, corrects locally: the text doesn't leave the machine, as confirmed by Druide's privacy policy. For a law firm or an accountant reviewing a contract or a client file, that difference matters more than any side feature. Druide even presents its multi-seat license as an answer for "organizations that ban the use of external servers" — a clause we regularly find in the specifications of our clients in the legal sector and accounting.

Where it falls short

That local solidity stops the moment you turn on a connected feature. Antidote Web processes the text on a server, and AI rewording does the same regardless of the version used: the privacy policy mentions a data transfer to Canada for personal accounts, without naming the AI provider behind the rewording. Nothing points to an ISO 27001 or SOC 2 certification either; Druide highlights technical frameworks (NIST, OWASP, PCI DSS) that few French public buyers recognize at first glance.

The commercial model has also changed: the purchase page now offers only an Antidote+ subscription bundling the software, the web version and the mobile version. It's no longer possible to buy Antidote 12 alone, as a permanent license, the way it used to be — a team that only wants the installed corrector pays for three products.

Our recommendation

Antidote remains the safest choice in this comparison for anyone who must keep their documents on the machine: it's one of the few correctors that proves it through its own privacy policy. The condition fits in one sentence: leave AI rewording and Antidote Web aside as soon as a text is confidential, and check that your budget absorbs the bundled subscription rather than standalone software.

Who it's for, and who it isn't

Suited for

A firm or freelancer that must keep client documents on their machine and is satisfied with local correction, with no server involved
An organization that contractually bans the use of external servers: the multi-seat license works offline
A writer who works mostly in French, with occasional English

Not a fit

An organization that wants to pay for the corrector once and for all: only the Antidote+ subscription appears on the purchase page
A firm that must produce an ISO 27001 or SOC 2 certification for a client or insurer: neither appears at Druide
A user who wants AI rewording without the text leaving their computer: this feature sends the text to a server, outside the EU according to the privacy policy

Frequently asked questions

Does Antidote send my texts to a server?: It depends on the version. Antidote 12 installed on the machine processes text locally and never transmits it to Druide's servers for base correction, according to its privacy policy. Antidote Web and AI rewording, on the other hand, send the text to a server, with a transfer to Canada for personal accounts.
Can you still buy Antidote without a subscription?: On the purchase page reviewed, no: only the Antidote+ plan, an annual subscription bundling the installed software, the web version and the mobile version, is offered. The former buy-once-and-own license model no longer appears in Druide's current commercial offer.
How much does Antidote cost for professional use?: The Personal tier, one language, starts at 59 € the first year then 48 € on renewal. The Family tier (up to 5 accounts) starts at 99 €. An offer for organizations from 5 seats exists, with a declining rate not published online.
Does Antidote suit an organization that bans external servers?: Yes, for Antidote 12's multi-seat license: Druide presents it as meeting "the requirements of organizations that ban the use of external servers", with offline operation. This guarantee doesn't extend to either Antidote Web or AI rewording, which require a connection.
What's the difference with LanguageTool or MerciApp?: For its base correction, Antidote remains installed software that doesn't depend on a server; LanguageTool and MerciApp are online services first. Antidote covers mainly French and English with rich dictionaries and guides; the other two aim more at team use and integration with messaging tools.