COB vs Sign PDF
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
COB
This electronic office solution streamlines business operations with digital document management and workflow automation. It aims to enhance efficiency and accessibility for corporate users.
- Electronic office solution
- Digital document management
- Workflow automation
- Business operations enhancement
- Increased efficiency
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Giải pháp văn phòng điện tử dành cho doanh nghiệp
Sign PDF
Easily sign, fill, and scan documents directly from your iPhone. Add signatures, stamps, and text to PDFs without needing to print or use a computer. All your work stays private on your device.
- eSign PDFs by drawing, typing, or importing
- Add custom stamps and seals with background removal
- Built-in document scanner to PDF
- Instantly fill out PDF forms
- Save multiple signatures and stamps
- Export flattened, device-consistent PDFs
- Privacy-focused, on-device processing
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Sign PDFs in seconds. Scan paper documents into PDF, fill out forms, add a hand-drawn signature, a business stamp or seal, date, or initials — all on your iPhone, all private. Sign PDF turns your phone into a pocket-sized document signer. Built for real life: lease agreements, NDAs, contracts, tax forms, permission slips, invoices, waivers. Scan a paper, sign it, stamp it, send it — no sign-up, no ads, no paywall on the essentials. FEATURES • eSign any PDF — draw, type, or import a signature • Import a stamp or seal — add your business stamp, company seal, or an Approved / Confidential / Date mark; the background is removed automatically, on-device • Built-in document scanner — paper to clean PDF with one tap • Fill forms instantly — tap on any field and type • Add checkboxes, dates, and text overlays • Save multiple signatures and stamps — pick the one you need per document • Export flattened PDFs that look identical on every device • Privacy by design — everything stays on your iPhone, nothing uploaded WHY WE BUILT IT Signing a PDF shouldn't require a $10/month subscription to a corporate service. Sign PDF is built by an indie studio, not a legal giant — it does one thing well and respects your time and your data. DESIGNED FOR EVERYONE - Renters signing leases from their phone - Freelancers turning around contracts on the go - Small business owners stamping and signing their paperwork - Anyone tired of printing, signing, scanning, emailing PRO (OPTIONAL) Upgrade to Sign PDF Pro to unlock: • Batch sign — send multiple PDFs in one go • iCloud sync — your signatures and stamps on every device you own • Unlimited signatures and stamps — store as many as you need • No ads forever Free tier stays free: you can always sign and scan without paying a cent. SUBSCRIPTION PRICING • Weekly — 3-day free trial, then $1.99/week • Monthly — $4.99/month • Annual — $19.99/year (best value) Payment is charged to your Apple ID at confirmation. Subscription auto-renews unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in Settings. Terms of Use: https://pdfsign.nomly.space/terms Privacy Policy: https://pdfsign.nomly.space/privacy
Screenshots
Verdict
The clearest difference is in-app purchases: COB at none against Sign PDF's 10. COB also leads on iOS requirement (15.5 vs 18). Sign PDF's advantage is update cadence (every 2 weeks vs every 6 weeks). On price, rating, ratings volume 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
Both are free to download. Sign PDF sells 10 in-app purchases, starting at $2.99 per 7 days. COB asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for COB against 5.0 for Sign PDF. Both are backed by a comparable volume of ratings — 2 and 1 respectively.
COB ships an update every 6 weeks, Sign PDF every 2 weeks. The most recent releases landed on September 8, 2026 and September 4, 2026 respectively.
| Parameter | COB | Sign PDF |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) | 5.0 (1 ratings) |
| Number of ratings | 2 — better | 1 |
| Update frequency | Every 6 weeks | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.5 — better | 18 |
| Further details — not scored | ||
| Size | 45 MB | 43 MB |
| Age rating | 4+ | 4+ |
| Developer | Co-opBank | DECLAN JOHN NANTON |
Customer experience
COB
Sign PDF
In-app purchases
COB
No in-app purchases
Sign PDF
- eSign & Fill Contracts$2.997 Days
- Stamp, Seal & Scan Pass$3.997 Days
- Fill Forms Pro Monthly$6.991 Month
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- Paperwork Pass — 3 Months$7.993 Months
- PDF Editor & Scanner Plan$9.991 Month
- Sign Documents Quarterly$9.993 Months
- Contract Kit — 3 Months$12.993 Months
- Annual — Unlimited Signatures$19.991 Year
- Unlimited Signatures Annual$29.991 Year
- eSignature & Stamps Yearly$39.991 Year









