Pair2FA VS KeptPDF

Pair2FA's answer

Most tools in this space share a vault. Pair2FA shares a code.

A teammate granted Viewer access to an account sees the live rotating six-digit code and nothing else. The underlying TOTP secret is never sent to them, so access can be withdrawn in one click without rotating the secret or re-enrolling anyone else.

The second difference is that permissions are per account, not per vault. Being a member of a workspace grants access to nothing by itself; every account is shared explicitly. That is what makes it workable for an agency holding several clients' credentials in one place, where a shared folder model would leak one client's access to the team working on another.

Exporting a raw secret is a separate permission on top of Manager, requires re-authentication every time, and is written to an audit log.

KeptPDF's answer:

KeptPDF runs entirely in your browser. Your file, and the text inside it, never leaves your device. Not to an AI, not even to us. You can open your browser's network tab and watch: the document bytes never go out.

Most online PDF tools upload your file to a server first, and some "AI redaction" services quietly send your document text to a third-party model. That is the exact risk people are trying to avoid when they redact something.

KeptPDF also does true redaction. The text is removed from the file, not covered with a black box you can copy out later. Every redaction produces a verification certificate you can share with the file.

Pair2FA's answer

Choose it when the problem is specifically shared 2FA on accounts that have no multi-user support, and when you need to be able to take that access back.

Against a password manager like 1Password or Bitwarden: those are the right answer if you also need to share passwords and your team has a seat each. Pair2FA is narrower - it shares only the rotating code, scoped per account rather than per vault, which fits an agency or a seller working with contractors who should see one client's account and nothing else.

Against an authenticator app: Google Authenticator and Authy are built for one person. Sharing with a team means photographing the setup QR code, which cannot be revoked and leaves the secret on someone's camera roll.

Do not choose it when the service you are sharing already offers real multi-user access, roles or partner access. Those are safer and you should use them first. Pair2FA exists for the logins that have no seat to give out.

KeptPDF's answer:

Three reasons.

Privacy you can verify, not just a promise. Processing happens locally in the browser, so there is no upload step to trust. We do send anonymous usage counts for quota, and we say so plainly, but never your document.

Real redaction with proof. Removed text is permanently gone, and you get a certificate showing the file was checked for leftover extractable text. Automated detection cannot catch everything, so a final human review is still your job, and the tool says that too.

It works on a phone. Most PDF suites assume a desktop. KeptPDF was built and used on a phone first, so redacting a document while you are standing in a hallway actually works.

Pair2FA's answer

Small teams who share logins they do not individually own.

Four groups in particular:

• Digital and marketing agencies operating client accounts - Meta Business Manager, Google Ads, Mailchimp, a client's own Google account - where the 2FA code goes to the client's phone and work stops until they answer.

• E-commerce sellers working with virtual assistants. Amazon Seller Central, Shopify, Etsy and eBay are single-login accounts, so the owner ends up relaying codes over chat at odd hours.

• Real estate teams sharing listing portals, MLS and IDX logins across agents.

• Engineering and DevOps teams with shared infrastructure accounts - an AWS root login, a CI bot account, a client-owned Cloudflare or registrar account - where access currently depends on one person being awake.

The common thread is not company size, it is that the account itself has no concept of more than one user, and the team has been working around that with screenshots.

KeptPDF's answer:

Anyone who has to hand a document to someone else and needs the sensitive parts gone first.

In practice that is solo attorneys and small law firms, accountants and tax preparers, healthcare and records staff handling requests, HR teams, and individuals dealing with their own medical, legal, or financial paperwork.

The common thread is not an industry. It is a person who cannot upload a confidential file to a random website, and who does not have an enterprise IT budget to solve it.

KeptPDF's answer:

A family member got seriously ill. We spent most days at the hospital, and straight answers were hard to come by, so we leaned on AI tools to make sense of the records, notes, and lab results.

But you cannot paste a medical record into an AI chat. You have to strip the names, the ID numbers, the diagnoses first. And almost every tool we found either wanted to upload the whole file to a server, or "auto-redacted" by sending the document text to an online AI. That was the exact thing we were trying to avoid.

Most of this was happening on a phone, at a bedside. So I built the tool I needed: redaction that runs on the device, works on mobile, and never sends the file anywhere. That turned into KeptPDF, which is now a full PDF suite with over 20 tools, all local-first.

Pair2FA's answer

Frontend: Next.js 16 (App Router) with React 19, Tailwind CSS v4 and Radix UI primitives. QR code scanning runs in the browser.

Backend: Node.js with Express, Prisma ORM over PostgreSQL.

Authentication: JWT bearer tokens, bcrypt password hashing, and Google OAuth via google-auth-library. Secret export uses a short-lived signed challenge bound to both the account and the caller's current session, then verifies a password or a Google ID token with nonce replay protection.

Cryptography: AES-256-GCM via Node's crypto module for secrets at rest, stored as iv:authTag:ciphertext. TOTP generation uses otplib, implementing RFC 6238.

Billing: Stripe Checkout and Customer Portal, with subscription state driven by signed webhooks.

Transactional email: Resend.

KeptPDF's answer:

The app is plain JavaScript with no front-end framework, which keeps it fast and keeps the code auditable.

PDF work happens in the browser using pdf.js for rendering and pdf-lib for writing. Text recognition uses Tesseract running as WebAssembly. Password and encryption handling uses a WebAssembly build of qpdf. It is a Progressive Web App, so it installs and works offline.

The thin server side is Node on Vercel, with Postgres for accounts, Stripe for billing, and Resend for email. None of those ever see a document.

KeptPDF's answer:

KeptPDF is early and independent, and we do not publish customer names. The product is privacy-first by design: we never see your documents, and we do not track who our users are or what they work on. Publishing a client list would sit badly next to that.

The user base today is mostly solo attorneys, small firms, accountants, and individuals handling their own records.