HNB Authenticator vs PlainPDF
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HNB Authenticator
This app provides a secure and straightforward method for authenticating sign-ins and transactions. It also allows for offline generation of One-Time Passwords (OTPs) via SMS for mobile data usage.
- Secure authentication
- Transaction authentication
- Offline OTP generation
- SMS-based OTPs
- Simple interface
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Use HNB Authenticator from HNB PLC which offers a simple & a secure way to authenticate sign-ins and transactions. For mobile data offline use, generate OTPs via SMS.
PlainPDF
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Scan, merge, compress and sign PDFs — every tool is free, with no watermarks, no account and no subscription. Your files are processed on your device and never uploaded. SCAN • Scan documents with automatic edge detection • Crisp black & white mode for text, plus colour and greyscale • Re-crop, rotate and reorder pages before saving • Make scans searchable with on-device text recognition EDIT • Sign PDFs: draw or type your signature, add the date, text and ticks • Organize pages: reorder, rotate, delete, duplicate, insert and extract • Add watermarks like CONFIDENTIAL or COPY • Add page numbers in six positions and four formats CONVERT • Merge PDFs and photos into one file • Split PDFs by page, by range or every few pages • Compress PDFs for email and upload limits — or set a target size, like "under 2 MB" • Turn photos into PDFs with A4, Letter or fit-to-photo pages • Copy text from any scan or photo PDF • Extract images from PDFs, or save pages as images SECURITY • Add a password to a PDF • Remove a password you know QR CODES THAT NEVER EXPIRE • Create QR codes for links, Wi-Fi, contacts, email, phone, SMS, UPI payments and locations • The information is stored in the code itself, so it keeps working without any server • Every code is tested before you save it • Printable sheets with 1, 4, 12 or 24 codes per page, with cut lines • Scan QR codes and see where a link really goes before opening it WORKS THE WAY YOU DO • Files app and "Open in PlainPDF" from Mail, Messages and other apps • Designed for iPhone and iPad, in light and dark mode FREE, HONESTLY Every tool is free with ads. PlainPDF Pro is a one-time purchase that removes ads, adds batch processing for many files at once, and unlimited text recognition on large documents. No subscription, ever. No account. Your files never leave your iPhone. Questions or ideas: hello@smileappsstudio.com
Screenshots
Verdict
The clearest difference is ads: HNB Authenticator at none against PlainPDF's shown. HNB Authenticator also leads on iOS requirement (14.0 vs 17.0). On price, update cadence, in-app purchases and device support 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
HNB Authenticator ships an update every 2 months, PlainPDF every 4 months. The most recent releases landed on October 12, 2026 and October 6, 2026 respectively.
| Parameter | HNB Authenticator | PlainPDF |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 2 months — better | Every 4 months |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 24 MB | 8 MB |
| Age rating | 17+ | 4+ |
| Developer | Hatton National Bank | Swaminathan L |
In-app purchases
HNB Authenticator
No in-app purchases
PlainPDF
No in-app purchases
