Naosuu Review (2026): Pricing, Features & Honest Verdict

TLDR

Naosuu is a Chrome extension that redacts confidential client data inside ChatGPT, Claude, and Gemini before the prompt leaves your browser. It runs fully local, with a review step so you approve every replacement. Best for: solo lawyers and small firms. Price: from $19.99/user/mo, no free plan. Rating: 7.1/10.

What is Naosuu?

Naosuu is a browser extension that sits between you and the big AI chatbots and scrubs sensitive information out of your prompts before they are sent. When you type a message into ChatGPT, Claude, or Gemini, Naosuu detects identifiers like client names, Social Security numbers, and case numbers, swaps them for placeholders, and then restores the originals in the AI’s response. The whole point is to let lawyers use public AI tools without handing privileged data to a third party.

It is built by Naosuu LLC, a small outfit based in Albany, New York, and aimed squarely at the legal market. We dug into how it works, and the design choice that stands out is that it does not use AI to do the redaction. Detection runs on rule-based pattern matching and named entity recognition, entirely on your machine, so nothing, not even anonymized data, is sent to Naosuu. For a confidentiality tool, that local-only model is the right call and the reason it can credibly market to attorneys.

The timing is what makes it relevant. Lawyers are already using ChatGPT and Claude to draft, summarize, and research, often quietly, and bar associations have started warning about the ethics of feeding privileged material into third-party models. Naosuu is a pragmatic answer to that tension: it does not try to ban the tools or replace them with a walled-garden legal AI. It just sits in front of the chatbots you already use and strips the parts that should never leave the firm. That practical stance is a big part of why it resonates with solo and small-firm attorneys who do not have an IT department writing AI policy for them.

What Are Naosuu’s Key Features?

Local-only redaction

Everything happens inside your browser. Naosuu intercepts the prompt before it reaches the AI platform, replaces the sensitive bits, and never transmits the raw text anywhere. There is no cloud step and no server-side log of what you redacted. That is the feature that makes it usable for privileged material, because the redaction itself is not creating a new leak.

Pre-flight review panel

Before a prompt goes out, Naosuu shows you a panel of every replacement it is about to make. You can approve, edit, or reject each one. This matters because automated redaction is never perfect, and a lawyer needs to confirm that a client name was caught and that a harmless word was not over-redacted into nonsense. The human-in-the-loop step is what separates this from a blind find-and-replace.

Legal-tuned detection

The pattern library is calibrated for the identifiers that show up in briefs, contracts, and client files, not just generic personal data. So case numbers, docket references, and party names get caught alongside SSNs and emails. Document upload is supported for PDF, Word, and plain text, so you can run a file through detection rather than pasting raw text.

Automatic restoration

Once the AI replies using your placeholders, Naosuu swaps the real values back in so the answer reads naturally. You get a usable response without ever exposing the underlying data to the model. It is a small touch, but it keeps the workflow from feeling like you are constantly translating between fake and real names. Without it, redaction tools become annoying enough that people stop using them, which defeats the purpose, so the restoration step is what keeps the habit sustainable.

Document upload support

Beyond inline prompts, Naosuu accepts document uploads in PDF, Word, and plain text, runs detection across the whole file, and shows you what it would redact before anything moves. That is handy when you want to summarize a contract or pull facts out of a brief rather than retyping passages into the chat box. The important caveat, which Naosuu is upfront about, is that the AI platform’s own attachment button bypasses the extension entirely. If you click the chatbot’s paperclip instead of Naosuu’s document button, your file goes straight to the model unredacted. The protection only holds if you route everything through Naosuu’s own controls.

How Much Does Naosuu Cost?

Naosuu starts at $19.99 per user per month, or $179 per user per year if you pay annually, which works out to a $60 saving. Both plans include a 30-day free trial, and the model is individual licensing, so there are no firm tiers or per-seat minimums to negotiate.

Compared with enterprise data-loss tools, that is cheap. Strac and similar AI governance platforms typically run $10 to $50 per user per month and bill on custom enterprise contracts with no public free tier. Grepture, a developer-focused PII redaction API, is free for up to 1,000 requests a month but is built for engineers wiring it into their own apps, not for a lawyer pasting into ChatGPT.

For a solo practitioner, $20 a month to avoid accidentally leaking client data is an easy yes. The catch is that the per-user model gets less attractive at firm scale, where you would want centralized billing and admin controls that Naosuu does not offer.

Who is Naosuu Best For?

Use Naosuu if you are a solo lawyer or a small firm that already relies on public AI chatbots and wants a simple, local safeguard against pasting privileged information. The legal-tuned patterns and the review panel fit that workflow well, and the price is low enough to expense without a second thought.

It is also a good fit for non-legal professionals who handle sensitive personal data in regulated work, like accountants or HR consultants, though the detection patterns are tuned for legal identifiers first, so you will get the most accurate coverage if your data looks like case files and contracts. The 30-day trial is long enough to run it against your real workflow before deciding, which lowers the risk of committing.

Skip Naosuu if you need organization-wide data-loss prevention with audit logs, admin policies, and coverage across Slack, email, and cloud storage. That is an enterprise DLP job, and Naosuu is deliberately narrower. Also skip it if your team uses the AI platforms’ native file attachment buttons heavily, because those bypass the extension and send documents straight to the model. And if your firm has a strict policy against any use of public AI tools at all, an extension that makes that use safer is not the same as a tool that makes it compliant; you will still need sign-off from whoever owns that policy.

Best Naosuu Alternatives

Strac

Strac is an enterprise DLP browser extension that intercepts prompts across 50-plus AI tools and also covers SaaS apps, cloud storage, and endpoints. It is far broader than Naosuu, with shadow-AI discovery and admin controls, but it sells on custom enterprise pricing (roughly $10 to $50 per user per month) and is overkill for a solo attorney. Choose Strac if you are protecting a whole company, not one practice.

Grepture

Grepture is a developer-first PII redaction API with public pricing and a free tier covering up to 1,000 requests per month. It offers reversible redaction for prompts hitting OpenAI or Anthropic models, which is technically similar to Naosuu. The difference is audience: Grepture is for engineers building it into software, while Naosuu is a ready-to-use extension for non-technical lawyers.

PiiBlock

PiiBlock is a lighter consumer-grade tool for masking personal data in ChatGPT, Claude, and Gemini. It is a reasonable cheaper-feeling option for general privacy, but it lacks the legal-specific pattern tuning that makes Naosuu credible for case files and contracts. Pick PiiBlock for casual personal use, Naosuu for actual client work.

Final Verdict: Is Naosuu Worth It?

Naosuu does one thing and does it well: it lets a lawyer use mainstream AI chatbots without leaking confidential client data, and it does so without ever phoning home. The local-only architecture and the pre-flight review panel are the right design decisions for privileged material, and at $19.99 a month it is priced like the small, focused tool it is.

The rating of 7.1 reflects a tool that nails its niche but stays inside it. There is no firm-wide administration, the browser-only approach can be bypassed by native file uploads, and detection is tuned for legal rather than every regulated field. For a solo attorney or small firm, it is a confident recommendation, and the 30-day trial means you can confirm it fits your practice before paying a cent. For an enterprise that needs centralized policy enforcement and real DLP coverage, look at Strac instead, but understand you will be paying enterprise prices for that breadth.