Comparison

Sign PDF vs かんたん電子印鑑

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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://getsignpdf.pages.dev/terms Privacy Policy: https://getsignpdf.pages.dev/privacy

About

かんたん電子印鑑

Features
Read full description

名前を入れるだけ。10秒で印鑑が作れて、PDFにそのまま押せるアプリです。 見積書・請求書・納品書・社内文書に、印刷して押し直す手間なく捺印できます。テレワークや在宅勤務の「ちょっと押して送りたい」に。 ■ 名前から10秒で作成 名前を入力して、書体・色・サイズ・かすれを選ぶだけ。丸印(個人の認印)も、会社の四角い角印(社印)も作れます。 ■ PDFを開いて、押したい場所をタップ PDFをこのアプリで開き、印鑑を選んで押したい場所をタップするだけ。ドラッグやピンチで位置と大きさを微調整して、そのまま書き出せます。共有シートからすぐに送れます。 ■ 透過PNGで書き出し 背景が透明なPNGで書き出せば、Word・Excel・メールにそのまま貼れます。 ■ 安心してお使いいただけます 印鑑の作成も、PDFへの押印も、すべてお使いの端末内で完結します。印影も書類も外部に送信されません。 無料で印鑑を3個まで作れます。買い切りのProにすると、広告が消えて印鑑を無制限に作れます(サブスクではありません)。 ※ 本アプリで作成する印影は、電子署名法に基づく電子署名ではありません。社内文書・見積書など商慣行上の押印にご利用ください。契約書など法的効力が求められる書類には、電子契約サービスをご利用ください。 ■ 規約とプライバシー 利用規約(EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ プライバシーポリシー: https://rainbowtree.work/app/privacy-ja.html

Screenshots

Sign PDF3 screens
かんたん電子印鑑3 screens

Verdict

The call

The clearest difference is in-app purchases: かんたん電子印鑑 at none against Sign PDF's 10. Sign PDF's advantage is ads (none vs shown). On price, update cadence, device support and iOS requirement 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 PDF sells 10 in-app purchases, starting at $2.99 per 7 days. かんたん電子印鑑 asks for nothing beyond the download.

UpkeepUpdate frequency

Sign PDF ships an update every 9 days, かんたん電子印鑑 every 11 days. The most recent releases landed on October 25, 2026 and October 20, 2026 respectively.

Scorecard2 real differences · 7 level
Sign PDF versus かんたん電子印鑑: the parameters behind the verdict, then further details
ParameterSign PDFかんたん電子印鑑
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 9 days — betterEvery 11 days
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad — betteriPhone
Requires iOS1817.0 — better
Further details — not scored
Size43 MB25 MB
Age rating4+4+
DeveloperDECLAN JOHN NANTONRAINBOW TREE LLC

In-app purchases

10 purchases

Sign PDF

Subscriptions10
  • eSign & Fill Contracts$2.997 Days
  • Stamp, Seal & Scan Pass$3.997 Days
  • Fill Forms Pro Monthly$6.991 Month
Show 7 more
  • 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
None

かんたん電子印鑑

No in-app purchases

Questions

Is Sign PDF free?
Sign PDF is free to download, with in-app purchases available.
Is かんたん電子印鑑 free?
かんたん電子印鑑 is free to download, with no in-app purchases.
Do Sign PDF or かんたん電子印鑑 have ads?
かんたん電子印鑑 shows ads; Sign PDF does not.
Which is updated more often, Sign PDF or かんたん電子印鑑?
Sign PDF ships an update every 9 days, and かんたん電子印鑑 every 11 days. Most recently, Sign PDF was updated on October 25, 2026 and かんたん電子印鑑 on October 20, 2026.

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