# MerciApp

> Write better, faster, wherever you work.

Canonical page: [https://chrome-stats.com/d/merciapp](https://chrome-stats.com/d/merciapp)

## Overview

- **ID:** `merciapp`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** MerciApp
- **Category:** language-support,social-communication
- **Daily users:** 2,422
- **Weekly downloads:** 96
- **Rating:** 3.97 / 5 (36 ratings)
- **Version:** 3.110.1
- **Last updated:** 2026-09-03
- **First published:** 2020-09-09
- **Size:** 3.71 MB
- **Data as of:** 2026-09-07
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/merciapp/)
- **Website:** [https://www.merci-app.com](https://www.merci-app.com/)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/merciapp/privacy/](https://addons.mozilla.org/firefox/addon/merciapp/privacy/)

## Description

MerciApp is your AI writing assistant in the browser. It corrects, rewrites, and structures emails, messages, and notes in real time without interrupting your workflow. Correct spelling, grammar, tone, and clarity as you type across Gmail, Outlook, CRM tools, chat apps, and collaboration platforms, with explanations for every suggestion to help you learn.

Beyond correcting, MerciApp offers Transform and Expand features: generate clearer rewrites, translate, and create smart snippets and team assistants. Define a corporate dictionary, reusable templates, and centralized governance for consistent, on-brand communication—while ensuring GDPR compliance and easy deployment across your team.

## Rankings

- #1,950 — Overall
- #81 — Language Support
- #225 — Social & Communication
- #20 — app
- #20 — merlin
- #32 — writing

## Permissions and access

### Permissions

- `activeTab`
- `alarms`
- `clipboardRead`
- `clipboardWrite`
- `cookies`
- `storage`
- `tabs`
- `management`
- `http://*/*`
- `https://*/*`
- `https://*.merci-app.com/*`

### Content script matches

- `*`
- `docs.google.com`

## Safety

- **Risk impact:** Very high risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- This extension was recently updated in the past month. New updates may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Review summary

MerciApp is praised for its effective and accurate error detection, particularly for French writing, and good privacy practices. The free version is sufficient for occasional users and the tool is practical and easy to use. However, multiple users complain about the low daily correction limit, sluggish performance causing typing delays on Firefox, outdated or incorrect examples in tutorials, and some inaccurate alerts on slang. Additionally, some find the premium payment prompts intrusive. Overall, it is useful but has notable limitations and usability issues on Firefox.

### Pros

- Effective and reliable at detecting errors, helping improve text quality quickly.
- Good privacy data management as confirmed by discussions with the founders.
- Free version usable and helpful for occasional users.
- Easy to use and practical for improving French writing.

### Cons

- Limited daily free quota (600 words) too low for occasional writers to correct small articles properly.
- Somewhat slow and heavy extension causing text input lag on Firefox, unlike on Chrome.
- Examples used in tutorials contain outdated or incorrect language usages, reducing credibility.
- Issues with false positives on slang or abbreviated words leading to some inaccurate corrections.
- Aggressive premium payment prompts locking the screen reported by at least one user.

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Source: [Chrome-Stats](https://chrome-stats.com/d/merciapp)