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Nova GuardNew

Use AI. Keep your data.

Before a message, a file or a screenshot goes to ChatGPT, Claude or Gemini, Guard reads it on your computer. It holds back what should not leave, and offers you a safe copy.

Try 7 days free Everything Guard checks

Included in the 7-day free trial. Then an option of your Nova subscription, from $7 a month.

Received an invitation? Open your administrator’s link.

Example 1 of 3

You drop a folder.Guard reads it before the AI does.

  1. 1You drag three files into the assistant
  2. 2Guard reads each one, on your computer
  3. 3It shows what it found and prepares copies
  4. 4You send the copies. The originals stay put.

Everything happens on the computer. Nothing is kept, no text is sent to Nova.

Sample data, made up for this demo.
Your AI assistantGuard is on
What would you like to do today?
Summarize this client folder for me.

Nothing is kept. No text is ever sent to Nova.

What it does

The AI does the work. Without seeing your data.

Write a friendly reminder to Claire Dubois at Lenoir & Fils: their €4,800 invoice is 15 days late. Add our IBAN FR76 3000 4000 0312.

Guard reads before it leaves
What it does, what it doesn’t

Clear, line by line. No empty promises.

6What Guard does

  • Reads before you sendWhat you type, paste or drop into an AI tool.
  • Replaces what is sensitiveNames, emails, IBANs, keys become stand-ins like [CLIENT 1].
  • Makes a safe copyOf your files and screenshots, marked “(anonymized)”.
  • Puts your real details backIn the AI’s answer, on your screen only.
  • Asks before risky movesA public share link, a service connected to an AI.
  • Follows 30 AI toolsOne by one, each with its own setting.

6What Guard doesn’t do

  • Keeps nothingNo text is stored. The history holds numbers, never words.
  • Sends nothing to NovaEverything happens on your computer.
  • Never touches your filesThe original stays as it is. You send the copy.
  • Shows no message to your companyIt sees numbers only, never the content.
  • Doesn’t stop you using AIThe AI still understands and answers the same way.
  • Doesn’t catch everythingIt helps you pay attention. It does not replace your judgment.
For companies

Your company decides.

It turns Guard on for the team, or not. It picks the allowed AI tools and, for each kind of data, lets it through, warns, or blocks.

  • Your AI policy becomes rules: let through, warn, or block.
  • Allowed tools, tool by tool.
  • Numbers only, never the content of a message.
Nova for companies Talk to us
Two ways to have Guard

On your own, or with your company.

  • Solo, student, or employeeOn your own

    You install Guard, choose your rules, and can turn it off or remove it at any time. Nothing leaves your computer.

  • One link sets Guard upSuggested by the company

    Your company’s rules arrive as a starting point. Everyone can change them, turn Guard off or leave.

  • Locked on every computerSet by the company

    Each person opens the invitation link and adds Guard to Chrome: no IT console needed. The rules apply as they are, leaving needs the admin code, and the company sees it if Guard is removed. Installed by the IT console, Guard cannot be removed at all.

Linked to a company, Guard sends Nova only daily numbers: checked, warned, blocked. Never a text, a file or a name.

Set it up in Nova
Where it looks

Wherever data can leave, Guard looks first.

  • What you type or pasteRead before you send, highlighted as you write.
  • Attached filesWord, Excel, PowerPoint, PDF, CSV and text files. Guard makes an “(anonymized)” copy; the original is untouched.
  • Images and screenshotsGuard reads the text in the image, on the computer, and covers what is sensitive.
  • Key files“.env”, “.pem” and other key files are held back by their name alone.
  • The AI’s answersStand-ins become your real details again, underlined, on your screen only.
  • What you copiedWith the desktop app: one shortcut checks your clipboard before you paste it anywhere.

30 AI tools followed one by one, each with its own setting: checked, free, or not allowed.

Other AI tools are recognized too, with one rule for those your company hasn’t listed. With the desktop app: the ChatGPT and Claude apps on your computer too.

Set it up

Ready in two minutes. Three steps.

  1. 1Start the free trial7 days, Nova Guard included
  2. 2Add Guard to ChromeChrome, Edge, Brave or Arc, on a computer. Guard links itself
  3. 3Invite your teamOne link to send. Your employees need no Nova account

Safari or Firefox: the app for Mac and Windows, coming soon. It will also cover your files, the clipboard and the ChatGPT and Claude apps.

On a phone? Guard installs on a computer: open this page there.

Try 7 days free
Everything Guard checks

The full list. Nothing hidden.

Your sector suggests, you choose everything. For each line: let it through, warn or block. Here are Guard’s default settings.

A few stand-ins, as examples 11

  • Keys and passwordsBlock

    OpenAI, Anthropic, Stripe, AWS and Google keys; GitHub, Slack and JWT tokens; private keys; addresses that hold a password; “password: …”; any token that looks random.

    sk-proj-4fX9…
  • Email addressesWarn

    Any address, except the domains your company allows.

    julie.laporte@verdier-capital.fr
  • Phone numbersWarn

    French and international numbers.

    06 12 34 56 78
  • Bank detailsBlock

    IBANs and payment cards, checked by calculation.

    FR76 3000 4000 0312…
  • ID numbersBlock

    French social security numbers (checked), passport numbers.

    1 85 05 78 006 084 36
  • People’s namesWarn

    A first name and a surname, “Mr Smith”, “Mrs Jones”.

    Julie Laporte
  • Client namesWarn

    The names on the list your company gives Guard.

    Verdier Capital
  • Internal termsWarn

    Projects, codes, words your company listed.

    Project Hermes
  • Private linksWarn

    Google Docs and Drive, Notion, SharePoint and OneDrive, Dropbox, Box, WeTransfer, Figma, Miro, Airtable, Jira, Confluence, Trello, Salesforce, HubSpot, Loom, intranet.

    docs.google.com/d/1x…
  • Code and internal serversWarn

    Internal IP addresses, servers, databases, configuration variables.

    10.0.4.12
  • Company IDsLet through

    French SIREN and SIRET numbers, checked. Let through unless you say otherwise.

    552 100 554 00025

Everything it sees, by family 49

49 rules in Guard 0.11.0. Each one can be set to let through, warn or block, for the whole company, a team or one AI tool.

  • People and contacts8
    • People’s namesA first name and a surname, “Mr Smith”, “Mrs Jones”Warn
    • Email addressesAny address, except allowed domainsWarn
    • Phone numbersFrench and international numbersWarn
    • Postal addressesNumber, street, postcode and cityWarn
    • Dates of birthA date after “born on”, “date of birth”Warn
    • Personal situationAge, nationality, marital statusLet through
    • Email signaturesName, job title and phone at the end of a messageWarn
    • Lists of peopleMore than five emails or names in one textWarn
  • ID numbers7
    • ID numbersSocial security (checked), passportBlock
    • ID documentsID card, driving licence, residence permit (announced)Warn
    • Foreign ID numbersUK, US, Spain, Italy, Belgium… (checked)Warn
    • Tax ID numbersFrench tax number (SPI), announced by nameWarn
    • Benefits numbersCAF, France Travail, health insurance, Vitale card (announced)Let through
    • Student IDsINE, student number, NUMEN (announced)Warn
    • Healthcare IDsRPPS (checked), ADELI, FINESSWarn
  • Money and banking5
    • Bank detailsIBANs and payment cards (checked)Block
    • AmountsSums in €, $, £ (depending on the amounts setting)Let through
    • Security codes (ISIN)Shares and bonds (checked)Let through
    • Crypto walletsBitcoin and Ethereum addresses (checked)Let through
    • Promo and gift codesA code after “promo code”, “coupon”, “gift card”Let through
  • Company and clients13
    • Client namesNames on the company listWarn
    • Supplier namesSuppliers on the company listWarn
    • Project namesProjects on the company listWarn
    • Internal termsProjects, codes, words the company listedWarn
    • Company rulesIn-house numbers described by an exampleWarn
    • Company namesA name with its legal form (SAS, Ltd, LLC, GmbH…)Let through
    • Company IDsSIREN, SIRET, French and EU VAT numbers (checked)Let through
    • File numbersInvoices, contracts, files, orders, claims (announced by a word)Warn
    • Key figuresRevenue, EBITDA, net income followed by an amountLet through
    • Commercial termsMargins, discounts, purchase prices followed by a figureLet through
    • Sensitive clausesThe amount of a severance, a penalty clause, a non-competeLet through
    • Patents and trademarksPatent (EP, FR, US, WO) and trademark numbers (announced)Let through
    • Confidentiality markers“Confidential”, “do not share”…Warn
  • Health and sensitive data3
    • Sensitive data (GDPR)Health, salary, discipline, religion, unionWarn
    • Medical informationConditions and treatments (diabetes, chemotherapy…)Let through
    • Medical codesICD-10, CCAM, prescriptions, drug batches (announced)Let through
  • Legal, property and transport7
    • Court case numbersRG, Portalis, appeal numbersWarn
    • Parties to a caseThe name after “claimant”, “defendant”, “Smith v. Jones”Let through
    • Land registry referencesParcel, section and numberWarn
    • Property referencesLease, tax property ID, energy rating (DPE), building permitLet through
    • License platesFrench plates AA-123-AA, VIN numbersWarn
    • GPS coordinatesPrecise latitude and longitudeLet through
    • Shipping numbersContainers (checked), parcel tracking, waybillsLet through
  • Keys and tech4
    • Keys and passwordsAPI keys, tokens, private keys, passwordsBlock
    • Code and internal serversInternal IP addresses, servers, databases, .env filesWarn
    • Private linksGoogle Drive, Notion, SharePoint, Dropbox, Figma, intranetWarn
    • Public IP addressesIPv4 and IPv6, not version numbersLet through
  • Risky actions2
    • Sharing a chat publiclyThe “Share” button in ChatGPT, Claude, Gemini…Warn
    • Connecting a service to an AIGoogle Drive, Gmail, Outlook, SharePoint, Slack, GitHub…Warn

Sectors you switch on in one tap 20

Your sector suggests, you choose everything. A sector raises a few rules; you change any line afterwards.

  • Healthcare
  • Legal
  • Banking
  • Accounting
  • Human resources
  • Real estate
  • Tech and IT
  • Sales and CRM
  • Manufacturing and construction
  • Education
  • Public sector
  • International
  • Consulting and audit
  • Insurance
  • Transport and logistics
  • Marketing and communications
  • Recruitment and staffing
  • Pharma and clinical research
  • Hospitality and food service
  • Non-profits

Questions

Can my company lock Guard?

Only if it chooses “set by the company”: its rules apply as they are, and leaving needs the admin code. If Guard is removed from Chrome, it sees that. Installed by its IT console, Guard cannot be removed at all. In suggested mode, or on your own, you stay in control.

Does Guard read my conversations?

Guard reads, on your computer, what you are about to send. Nothing is kept, and no text is sent to Nova: linked to a company, Guard only sends daily numbers. Its history keeps the last 50 events as numbers, never the text.

Does Guard stop everything?

Guard spots what looks like sensitive data. It can miss some. It helps you pay attention; it does not replace your judgment.

Does the AI still understand my message?

Yes. It gets stand-ins in place of names and numbers, so it can write the same answer. Guard puts your real details back on your screen.

Which browsers?

Chrome, and the browsers built on the same base: Edge, Brave and Arc.

What about my original files?

They do not move. Guard makes a copy, and that copy is what you send.

AI at work, without letting anything slip.

Try 7 days free