mAIsk
Desktop privacy tool • local-first • works with ChatGPT, Claude, Gemini, Codex and more

Work with AI — without leaking confidential data.

mAIsk masks sensitive information before sending prompts to AI tools and restores it afterward — automatically and locally. Built for legal, healthcare, finance, education, IT, and anyone handling real-world confidential data.

100% localNo cloudNo telemetryDeterministic placeholdersDummy data substitution in Pro
Version 1.0 — early release. Stable core workflow, actively improved based on user feedback.
Download Community — FreeBuy Pro — $29

One executable. Community by default. Pro unlocked with an activation key.

Latest version: 1.0.0
1. Rewrite sensitive text

Use AI to improve wording while keeping names, IDs and internal links out of the prompt.

Original text
John Smith ([email protected])
Case: 882199
Portal: https://internal.example.local

Please rewrite this in a more polite tone:
"John Smith, your documents are still missing.
Upload them today or your case will be delayed."
↓
Masking for AI
Placeholders
[NAME_001] ([EMAIL_001])
Case: [ID_001]
Portal: [URL_001]

Please rewrite this in a more polite tone:
"[NAME_001], your documents are still missing.
Upload them today or your case will be delayed."
Dummy data (Pro)
Harry Potter ([email protected])
Case: 552014
Portal: https://portal.example.test

Please rewrite this in a more polite tone:
"Harry Potter, your documents are still missing.
Upload them today or your case will be delayed."
↓
AI reply (still masked)
Placeholders
Dear [NAME_001],

Some documents are still missing for case [ID_001].
Please upload them via [URL_001]
to avoid delays.

Kind regards
Dummy data
Dear Harry Potter,

Some documents are still missing for case 552014.
Please upload them via
https://portal.example.test
to avoid delays.

Kind regards
↓
Unmasked AI reply
Dear John Smith,

Some documents are still missing for case 882199.
Please upload them via https://internal.example.local
to avoid delays.

Kind regards
2. Analyze IT logs safely

Ask AI for troubleshooting help without exposing internal IPs, URLs or user details.

Original text
src=10.15.22.14 dst=172.31.44.9
User: [email protected]
URL: https://vpn.internal.company.local

Users cannot connect to the VPN.
What should I check first?
↓
Masking for AI
Placeholders
src=[IP_001] dst=[IP_002]
User: [EMAIL_001]
URL: [URL_001]

Users cannot connect to the VPN.
What should I check first?
Dummy data (Pro)
src=192.168.15.12 dst=10.10.45.22
User: [email protected]
URL: https://vpn.example.test

Users cannot connect to the VPN.
What should I check first?
↓
AI reply (still masked)
Placeholders
Likely checks:
- test connectivity from [IP_001] to [IP_002]
- confirm [URL_001] is reachable
- review policy changes affecting [EMAIL_001]
Dummy data
Likely checks:
- test connectivity from 192.168.15.12 to 10.10.45.22
- confirm https://vpn.example.test is reachable
- review policy changes affecting [email protected]
↓
Unmasked AI reply
Likely checks:
- test connectivity from 10.15.22.14 to 172.31.44.9
- confirm https://vpn.internal.company.local is reachable
- review policy changes affecting [email protected]
3. Draft replies with personal data

Use AI for admin or legal drafting while keeping names, emails and addresses out of the prompt.

Original text
Client: Maria Rossi
Email: [email protected]
Address: Via Roma 21, Milano

Please draft a confirmation email for receipt
of the signed agreement and mention the
details we have on file.
↓
Masking for AI
Placeholders
Client: [NAME_001]
Email: [EMAIL_001]
Address: [ADDRESS_001]

Please draft a confirmation email for receipt
of the signed agreement and mention the
details we have on file.
Dummy data (Pro)
Client: Laura Bianchi
Email: [email protected]
Address: Via Dante 8, Torino

Please draft a confirmation email for receipt
of the signed agreement and mention the
details we have on file.
↓
AI reply (still masked)
Placeholders
Subject: Agreement received

Dear [NAME_001],

This is to confirm receipt of your signed agreement.
We have recorded your email as [EMAIL_001]
and your address as [ADDRESS_001].
Dummy data
Subject: Agreement received

Dear Laura Bianchi,

This is to confirm receipt of your signed agreement.
We have recorded your email as [email protected]
and your address as Via Dante 8, Torino.
↓
Unmasked AI reply
Subject: Agreement received

Dear Maria Rossi,

This is to confirm receipt of your signed agreement.
We have recorded your email as [email protected]
and your address as Via Roma 21, Milano.
“I want to use AI, but I can’t paste client data.”Typical legal workflow pain point
“We need speed, but not at the cost of confidential records.”Healthcare administration reality
“Names, emails, URLs and IDs are exactly what staff keep pasting.”IT and operations concern
“The safest prompt is the one that never contains the real data.”mAIsk positioning
“I want to use AI, but I can’t paste client data.”Typical legal workflow pain point
“We need speed, but not at the cost of confidential records.”Healthcare administration reality
“Names, emails, URLs and IDs are exactly what staff keep pasting.”IT and operations concern
“The safest prompt is the one that never contains the real data.”mAIsk positioning
How it works

A simple safety layer between you and the AI.

mAIsk is designed for real work, not demos. It keeps sensitive data off the prompt while preserving a practical workflow for daily use.

Mask

Sensitive elements such as names, emails, URLs, IDs, IPs and other patterns are replaced locally with deterministic placeholders.

Use AI

Send the masked text to ChatGPT, Claude, Gemini, Codex or any tool you use. The AI never sees the original values.

Restore

Paste the answer back into mAIsk and restore the original data locally, in place, without cloud dependencies.

Who it is for

Built for professionals who handle real confidential data.

If your daily work includes names, emails, internal systems, identifiers, case numbers, or sensitive operational details, mAIsk makes AI usage more practical and safer.

Legal

Lawyers, conveyancers, legal assistants, compliance teams, contract reviewers.

Healthcare admin

Scheduling, referrals, back-office staff, patient-record workflows, medical administration.

Finance and accounting

Accountants, payroll, client file handling, invoice and reconciliation support.

Education

School administration, safeguarding-related notes, university support operations.

IT and operations

Engineers, sysadmins, support teams, log handling, ticketing and infrastructure work.

Consulting

Advisors who need AI speed but cannot expose customer, project or internal data.

Features

Practical privacy, not theoretical promises.

The product is intentionally focused: stable masking, predictable placeholders, local restoration, and a workflow that makes sense under time pressure.

Deterministic placeholders

Stable, reversible placeholders using the format ⟦CATEGORY_###⟧ to preserve context and enable safe restoration.

Local-only processing

Masking and restoration happen on your machine. No cloud dependency is required for the core workflow.

Automatic + manual masking

Built-in detectors cover common data types. Manual masking handles the rest when judgment matters.

Dummy data substitution

Pro can replace sensitive values with realistic fake data when placeholders are too disruptive for the prompt.

Session-oriented workflow

Designed for actual iterative work with AI rather than one-off toy examples.

Activation-key unlock

One executable. Community by default. Pro unlocked through a local activation flow without turning the app into a SaaS.

Pricing

Simple enough to buy. Useful enough to keep using.

No subscription. No activation drama. Start with Community, upgrade to Pro when you need the full workflow.

Community
Free

For evaluation and light usage.

  • Up to 10 placeholders per operation
  • Basic masking and restore
  • Built-in categories
  • Local-only processing
  • No dummy data substitution
  • No custom categories
  • No session persistence
Download Community
Pro
$29 lifetime

For professionals working with real confidential data.

  • Unlimited masking and restoration
  • Dummy data substitution
  • Session save and reload
  • Custom categories
  • Priority fixes and updates
  • Single executable, activation-key unlock
Buy Pro — $29
Important: mAIsk reduces prompt leakage risk significantly, but it is not magic. If information is left unmasked or is obvious from context, the AI can still infer it. Use it as a strong safety layer, not as an excuse to stop thinking.
Why this problem is real

Prompt leaks are not theoretical.

Public incidents and restrictions around generative AI keep showing the same pattern: people paste sensitive information into tools faster than policies can stop them.

Samsung and ChatGPT: internal code and confidential data entered into prompts

A well-known example of employees pasting sensitive material into an AI system during real work.

 ChatGPT history/billing exposure bug

A reminder that even major platforms can have software bugs that expose information unexpectedly.

 Why enterprises restricted AI tools

Some organizations limited generative AI use because staff were pasting code, strategy and confidential records.
View all incident pages
Launch

Use AI more confidently with a safer workflow.

Start with Community or unlock Pro when you need unlimited masking, dummy data substitution and the full professional workflow.

Download Community — FreeBuy Pro — $29
Questions or enterprise interest: [email protected]