VerbaClara is a browser extension that helps you correct writing and learn from mistakes. VerbaClara does not operate a backend that receives your emails or documents.
What we store on your device
These are kept in chrome.storage.local in your browser, not on a VerbaClara server:
- Settings: languages, provider, server URL, model name and voice code.
- An optional API key you paste. It is sent only to the endpoint you configure.
- Short grammar “crumbs”: wrong phrase → correct phrase, plus a rule label, category and mastery level. Each side is capped at 80 characters; history is capped at 500 entries.
- Practice mastery scores and the result of the last daily practice.
Full messages and documents are not saved. A short sentence can appear only as an 80-character fragment. You can clear history at any time in Settings.
Text you ask VerbaClara to fix
- Harper (default): English grammar and spelling are checked inside the extension, using WebAssembly on your computer. The text is not sent to VerbaClara or to any AI provider. Each catch is filed into a learning category on your device.
- Offline first explanation: the first explanation for common Harper categories is generated locally from a bundled phrase pack. It uses no model, API key or network connection.
- Local model (Ollama / LM Studio) or Local-only mode: a rewrite is sent only to localhost on your machine. It does not leave your computer. Local-only mode blocks every non-localhost AI endpoint, even if a cloud provider is selected.
- Online API (your OpenAI or Google key, or a supported compatible server you configure): the selected or auto-detected sentence is sent to the endpoint you configure. Emails, phone numbers, URLs and long digit sequences are masked with placeholders before the request, then restored in the corrected text shown to you.
Masking reduces accidental exposure; it does not anonymise everything. Names, context and the rest of the sentence still go to the provider you chose, and that provider’s privacy policy applies to the remaining text. If that matters, use Ollama or turn on Local-only mode.
Practice lessons
When you start a Practice Lab lesson, only the short crumbs are sent to the model you chose for lessons: wrong phrase, correction, rule label and category. The original email or document is not sent. With Harper selected as the checker, lessons use the separate lesson model you configure under Practice lessons. PII masking applies to fix and rewrite requests; lesson prompts contain only short crumbs and are not PII-masked. Choose a local lesson model if you want those to stay on your device.
Permissions and network access
A content script runs so the floating Fix interface can appear where you write. Password fields and non-text inputs are excluded from the capture helpers. The extension ships with network access only for local model addresses on localhost and the AI provider domains listed in its manifest. VerbaClara does not sell your writing, does not use it for advertising and does not include an analytics SDK.
Children and contact
VerbaClara is not directed at children under 13. For privacy questions, email hello@verbaclara.app.
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