Sign PDF vs Codex.
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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://getsignpdf.pages.dev/terms Privacy Policy: https://getsignpdf.pages.dev/privacy
Codex.
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An archive, hidden behind a focus timer. Start a session. Watch the hour take shape. When you finish, it becomes part of your archive. a quiet record of the days you showed up. No streaks to maintain. No points to earn. Just your work, collected over time. The timer Choose from Pomodoro, Eisenhower, 52·17, HIITT Focus, or build your own. A single arc marks the passing hour. Nothing else competes for your attention. The archive Every session is recorded. Browse by day, by month, by year. Watch the pages fill. The passages As your focus deepens, Codex reveals short literary passages, written reflections on attention, patience, and the quiet work of becoming. Codex Unbound Full access to all features, including the archive and passages. Available monthly or yearly. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://codexbymeridian.netlify.app/privacy
Screenshots
Verdict
The clearest difference is update cadence: Codex. at every 3 days against Sign PDF's every 9 days. Codex. also leads on iOS requirement (13.0 vs 18). On price, ads, 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. Sign PDF sells 10 in-app purchases, starting at $2.99 per 7 days and Codex. sells 1 in-app purchase, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.
Sign PDF ships an update every 9 days, Codex. every 3 days. The most recent releases landed on October 6, 2026 and October 10, 2026 respectively.
| Parameter | Sign PDF | Codex. |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 9 days | Every 3 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18 | 13.0 — better |
| Further details — not scored | ||
| Size | 43 MB | 137 MB |
| Age rating | 4+ | 4+ |
| Developer | DECLAN JOHN NANTON | Niels De Jong |
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
Codex.
- Codex Unbound Monthly7 Days trial$2.991 Month









