Comparison

Web PKI vs Sign App

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Web PKI

Perform digital signatures using certificates from your mobile device on compatible websites and applications. Securely authenticate documents and transactions on the go.

Highlights
  • Digital signatures with mobile certificates
  • Compatibility with websites
  • Compatibility with applications
  • Secure authentication
Features
Read full description

O Web PKI permite realizar assinaturas digitais com certificados do seu celular em sites ou aplicativos compatíveis.

About

Sign App

Easily sign PDF documents, scan paper files, and manage your paperwork. Create custom electronic signatures and apply them to documents in seconds. Organize, export, and share your signed files securely.

Highlights
  • Create and apply electronic signatures
  • Scan paper documents to PDF
  • Import and edit PDF files
  • Organize documents with folders
  • Export and share signed PDFs
  • Local document storage
Features
Read full description

"Sign App" is a fast and intuitive mobile app for e-signing PDF documents, scanning paper files, and managing all your signed paperwork in one place. Create your electronic signature once — draw, type, or upload — and apply it to any document in seconds with the signature maker. • Sign Documents Instantly • - E-sign PDF documents with a legally-binding electronic signature. - Create unique e-signatures: draw to sign with your finger or Apple Pencil, type to sign with elegant handwriting fonts, or upload your real signature from a photo. - Save multiple signatures and reuse them across all your documents. - Automatic background removal for uploaded signature images — clean, professional results every time. • Import & Scan Documents • - Import PDF files directly from the Files app. - Scan paper documents using your iPhone camera and convert them to PDF instantly. - Import images (JPEG, PNG) from your photo library and automatically convert to PDF. - Supports documents up to 50 MB for seamless PDF signing. • Powerful Document Editor • - Add e-signatures, text fields, dates, and checkmarks to any page of your PDF. - Drag and drop annotations to position them precisely on the document. - Navigate and sign multi-page PDF documents with ease. - Undo and redo edits — never worry about making a mistake. • Organize & Manage Documents • - Create folders to keep contracts, invoices, and agreements neatly organized. - Search, rename, and filter documents by status: Draft, Signed, or Shared. - Switch between grid and list views to browse your document library. - Automatic thumbnail previews for quick document identification. • Export & Share Signed Documents • - Share signed PDF documents via email, messaging apps, AirDrop, and more. - Save signed documents as PDF to the Files app for easy access. - Export individual pages as images to your photo gallery. - Track shared documents — every exported file is marked for your records. • Securely Stored on Your Device • - All documents and signatures are stored locally on your device — your data never leaves your phone without your permission. - No account or login required. Start signing documents immediately. - Your sensitive contracts and personal documents remain private and secure. • Free & Pro Plans • - Sign up to 3 documents per month for free with the document signer. - Upgrade to Sign App Pro for unlimited document signing, unlimited saved signatures, folder organization, all editing tools, and priority support. - Choose Monthly, Yearly, or Lifetime plans — cancel anytime. Whether you need to sign a contract, fill out a form, e-sign an invoice, or scan and digitize paper documents — Sign App is the fastest way to get documents signed on your iPhone. Download the #1 e-signature app and start signing documents today. • Subscription Information • Payment will be charged to your Apple ID account upon confirmation of purchase. The subscription automatically renews unless auto-renewal is turned off at least 24 hours before the end of the current billing period. You can manage your subscription and turn off auto-renewal in your device's Account Settings after purchase. No cancellation of the current subscription is allowed during the active subscription period. Lifetime purchase is a one-time payment with no renewal. Privacy Policy: https://kenansezginbas.com/privacy-policy/ Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Web PKI1 screens
Sign App4 screens

Verdict

The call

The clearest difference is rating: Sign App at 5.0 against Web PKI's 1.0. Sign App also leads on update cadence (every 3 weeks vs every 2 months). Web PKI's advantage is in-app purchases (none vs 3) and ratings volume (4 vs 1). On price and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Sign App sells 3 in-app purchases, starting at $4.99 per month. Web PKI asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Sign App holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

UpkeepUpdate frequency

Web PKI ships an update every 2 months, Sign App every 3 weeks. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

Scorecard7 real differences · 3 level
Web PKI versus Sign App: the parameters behind the verdict, then further details
ParameterWeb PKISign App
PriceFreeFree
Rating1.0 (4 ratings)5.0 (1 ratings) — better
Positive reviews25.0% of reviews—
Number of ratings4 — better1
Update frequencyEvery 2 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.0 — better26.2
Further details — not scored
Size31 MB13 MB
Age rating+44+
DeveloperLacuna SoftwareKenan Sezginbas

In-app purchases

None

Web PKI

No in-app purchases

3 purchases

Sign App

Subscriptions2
  • Subscription Monthly$4.991 Month
  • Subscription Yearly$14.991 Year
One-time1
  • Subscription Lifetime$19.99

Questions

Is Web PKI free?
Web PKI is free to download, with no in-app purchases.
Is Sign App free?
Sign App is free to download, with in-app purchases available.
Which has better reviews, Web PKI or Sign App?
Sign App is rated higher. Web PKI averages 1.0 out of 5 from 4 ratings, while Sign App averages 5.0 from 1 ratings.
Do Web PKI or Sign App have ads?
Neither Web PKI nor Sign App shows ads.
Which is updated more often, Web PKI or Sign App?
Web PKI ships an update every 2 months, and Sign App every 3 weeks. Most recently, Web PKI was updated on November 6, 2026 and Sign App on October 31, 2026.

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