Correction as you write
MerciApp catches spelling, grammar, punctuation, and typography mistakes, including those that depend on the meaning of the sentence. Each correction comes with a short explanation.
AI tools · Write, proofread, translate
MerciApp pricing, use cases, and first steps
MerciApp is a spelling and grammar checker designed in France. It installs in your browser and underlines your mistakes as you write: in Gmail, Slack, Notion, or your customer relationship tool. It can also rewrite a passage in one click and insert ready-made replies. AI is used for rewriting; correction relies on its own language engines.
MerciApp has a free plan. The recommended plan to start with: Free, €0. Prices checked on October 3, 2026 on the vendor’s official page.
MerciAppThe French grammar checker that proofreads your writing where you type it- Vendor
- MerciApp (France)
- Free plan
- Yes
- Recommended plan
- Free, €0
- Page checked on
- October 3, 2026
What MerciApp does
Who it’s for: anyone who writes to customers or colleagues, and especially customer service and sales teams.
Automatic correction and style advice
With the paid plan, obvious mistakes correct themselves, with no click. MerciApp also flags awkward wording, unclear sentences, and shifts in tone.
Transform: rewrite in one click
You select a passage and choose an assistant. There are more than fifteen ready to use: improve the style, make it more professional, shorten, turn into a list, switch to an informal tone, translate into English. No prompt to write.
Also
- Your own assistants and your favorites
- Expand: ready-made replies
- The company dictionary
- In Word, Outlook, and Windows software
- Statistics and team management
MerciApp pricing
Prices exclude VAT (20%). The yearly subscription comes to €144 per year per user. Payment by card. You can cancel at any time: paid access stays open until the end of the paid period.
| Plan | Price | Who it’s for |
|---|---|---|
| Free Recommended to start | €0 | To explore, or if you write little |
| Assist | €12 per user per month, billed yearly (€24 monthly), excl. VAT | For writing all day, alone or as a team |
| Enterprise | Custom pricing | Large teams |
What the free plan includes
Correction in the browser, limited to 600 words checked per day, and 3 Transform rewrites per day. Without ready-made replies (Expand), automatic correction, or style advice.
Nova’s advice
Start for free: the first 30 days give you access to everything, with no credit card. If the limit of 600 words per day then holds you back, or if you reply to customers all day, the yearly Assist plan is worth it. For an occasional email, the free version is enough.
A first try, in 3 minutes
Your data. MerciApp states hosting in France, no sharing with third parties, and no AI training on your texts.
What it does less well
- No extension for Safari, Opera, or Brave, and no phone app. The Word and Outlook add-ins don’t work on mobile either.
- The free version stops at 600 words checked and 3 rewrites per day. Over a workday, you reach that quickly.
Correct, then rewrite an email in three minutesMerciApp- Open your email in the browser and start a new message.
- Paste the text below: it contains four mistakes, slipped in on purpose.
- The small square turns red. Click each underlined word, read the explanation, then accept the correction.
- Then select all the text. Open Transform with the floating button, or with the Alt + M shortcut.
- Choose an assistant, for example the one that improves style, and compare the result with your text.
- Keep the version that sounds like you. You remain the author of the message.
The prompt to copy
Hello, I send you the quote yesterday. Can you confirm that you recieved it? I am available too discuss it at you’re convenience.
Jobs that use MerciApp
In the starter kit for 2 jobs.
Alternatives to MerciApp
Antidote
The reference checker for French, with its dictionaries and guides, installed on the computer.
LanguageTool
A European checker for more than thirty languages, with a generous free plan.
Grammarly
The usual choice if you write mostly in English.
Reverso
If translation is your main need, with example sentences in context.
DeepL
To translate a whole document and improve a text with DeepL Write.
Frequently asked questions about MerciApp
How much does MerciApp cost?
Free: €0; Assist: €12 per user per month, billed yearly (€24 monthly), excl. VAT; Enterprise: custom pricing. Prices checked on October 3, 2026 on the vendor’s official page.
Can you use MerciApp for free?
Yes. Correction in the browser, limited to 600 words checked per day, and 3 Transform rewrites per day. Without ready-made replies (Expand), automatic correction, or style advice.
What happens to my data with MerciApp?
MerciApp states hosting in France, no sharing with third parties, and no AI training on your texts.
What are the alternatives to MerciApp?
Antidote: The reference checker for French, with its dictionaries and guides, installed on the computer. LanguageTool: A European checker for more than thirty languages, with a generous free plan. Grammarly: The usual choice if you write mostly in English. Reverso: If translation is your main need, with example sentences in context. DeepL: To translate a whole document and improve a text with DeepL Write.
Official pages consulted
Page checked on October 3, 2026. Brands are named to identify the tools. No affiliation.