Proof Logo
Proof Field & Docs
VI Free Download
2-in-1 Suite: Field Work & Document Stamping

Proof: Field Work Camera & Doc

Site GPS Stamp, ID A4 & Sign

A specialized all-in-one suite combining a Tamper-Evident Field Proof Camera (real-time GPS coordinates, altitude, compass azimuth, SHA-256 Proof ID) and a True-Scale Document & PDF Studio (true-scale 1:1 A4 ID card layout, wet-ink PDF sign & offline OCR to Word) right on your iPhone.

Free Download on App Store
Coming Soon
Android Release Google Play
100% On-Device Processing
SHA-256 Proof ID Hash
No Account Required
Field GPS & Azimuth
1:1 A4 ID Card Scale
Field work camera screen with real-time GPS coordinates and timestamp
HIGHWAY EXPANSION (PK-02) INSPECTED
TIME: 2026-11-09 23:59:00 GMT+7
GPS: 21°01'42.4"N 105°49'38.2"E • ALT: 18.4m
AZIMUTH: 124° SE • TILT: -2.1°
ADDRESS: Nam Tu Liem, Hanoi
PROOF ID: 9F8E4A1C... SHA-256 VERIFIED
All-in-One Architecture

Two Essential Workflows in One Single App

Eliminate disjointed tools. Proof bridges tamper-evident field photography with precise job-site document and ID preparation.

Real-time Timestamp & GPS Stamping

Permanently print date/time, GPS coordinates, altitude, detailed address, device tilt angles, and compass azimuth directly onto every photo and video.

SHA-256 Proof ID Cryptographic Verification

Generates a tamper-evident cryptographic hash from capture metadata at the exact moment of capture to guarantee non-repudiation in job-site disputes.

Dedicated Templates: Attendance & Inspection

Smart clock-in / clock-out shift detection for distributed field staff; dedicated templates for Site Inspection, Handover, and Security Patrol.

Versatile Framing & Stamp Positioning

Toggle individual metadata fields, switch aspect ratios (3:4, 16:9, 1:1, Full Screen), and freely position the stamp card anywhere on screen.

Field shift attendance clock-in camera preview with GPS data

True-Scale 1:1 A4 ID Card Layout

Automatically arranges front and back of ID cards (85.6 × 53.98 mm), Driver's Licenses, and Passports on standard A4 paper at physical 1:1 scale.

Dual-Page Book & Site Log Splitting

Capture facing pages of construction logbooks or manuals in one shot; smart boundary algorithms flatten page curves and split them cleanly.

Wet-Ink Hand Signing & Red/Blue Seal Stamping

Sign multi-page PDF inspection reports with finger touch and overlay custom red/blue organization seals with intelligent white-background removal.

100% Offline OCR & Direct Export to Word (.docx)

High-accuracy on-device text recognition with full-text search across records and direct export to editable Microsoft Word documents.

A4 SPECIFICATION (210 × 297 mm) 1:1 SCALE VERIFIED
NATIONAL IDENTITY CARD
FRONT SIDE (85.6 × 54 mm)
BACK SIDE & QR CODE
BACK SIDE (85.6 × 54 mm)
PROOF TRUE-SCALE ENGINE NO DISTORTION / NO RESIZING
Privacy & Cryptographic Security

Why Field Records with Proof Are Irrefutable

Engineered to meet the highest digital integrity standards for construction contractors, site engineers, and field auditors.

SHA-256 Proof ID

Deterministic cryptographic hash created instantly from raw capture metadata and image bytes. Prevents retroactive tampering of time and GPS coordinates.

100% On-Device Processing

All photo stamping, A4 rendering, OCR text recognition, and PDF/DOCX generation run locally on your phone. No data leaves your device without your consent.

No Account or Sign-in

Ready the moment you download. Zero account registration, zero email prompts, zero phone number requests. 100% focused on immediate job-site utility.

Face ID & Passcode Lock

Protect confidential inspection files and sensitive ID copies with Apple LocalAuthentication (Face ID / Touch ID) powered by the hardware Secure Enclave.

0%
On-Device Processing
SHA-0
Proof ID Cryptographic Hash
Scale 0:1
True Physical A4 ID Layout
0 Byte
Sent to Remote Servers
Job-Site Scenarios

Built for High-Stakes Field Operations

Trusted by site supervisors, construction teams, security patrols, and operations managers.

Construction & Engineering Construction engineer inspecting structural rebar on site

Site Engineers & Supervisors

Capture rebar placement, concrete pours, and structural progress with verifiable GPS and tilt angles. Sign inspection records and handovers directly in PDF on site.

  • Tamper-evident handover documentation
  • Direct wet-ink sign and red seal on multi-page reports
Security & Patrol Security officer conducting perimeter patrol checks

Security & Patrol Verification

Record perimeter rounds and checkpoint visits with live second-accurate timestamps and street locations, completely eliminating fraudulent patrol logs.

  • Live second-accurate timestamp stamping
  • Reliable offline GPS in basements and remote posts
Human Resources Field staff clocking in for morning shift with GPS photo

Shift Attendance for Distributed Teams

Smart shift template detects morning clock-in and evening clock-out, capturing facial photos at assigned job sites with verifiable GPS coordinates.

  • Prevents proxy attendance and location spoofing
  • Fast batch export of daily attendance photo logs
Office & Compliance True scale ID card and driver license scanning onto A4 page

Administrative Paperwork & ID Filing

Place both sides of ID cards or driver's licenses onto standard A4 paper at physical 1:1 scale for official filing; perform offline OCR on paper contracts to Word.

  • Millimeter-accurate physical dimensions
  • Offline OCR conversion straight to Word (.docx)
Got Questions?

Frequently Asked Questions

Key architectural facts you should know about Proof.

Proof combines two specialized field workflows into one seamless tool: The Proof Camera stamps real-time GPS coordinates, compass azimuth, altitude, and a tamper-evident SHA-256 Proof ID hash directly onto photos; The Documents workflow features a true-scale 1:1 A4 ID layout engine, 2-page book splitting, wet-ink PDF signing/stamping, and offline OCR to Word.
Never. Proof processes 100% of your data locally on your device. We operate no cloud servers that receive your photos, videos, documents, or personal inputs. GPS coordinates are only passed to iOS built-in location services to translate coordinates into local street names.
Yes. Proof renders ID cards (85.6 × 53.98 mm) and passports (125 × 88 mm) to exact physical dimensions on a standard A4 page. When printed at 100% scale without page scaling, the printed copies match physical card dimensions precisely.
At the exact moment of capture, a cryptographic SHA-256 hash is computed from the capture timestamp, GPS coordinates, and hardware sensor readings. This deterministic Proof ID is printed onto the photo, providing tamper-evident proof that the image was taken at the specified time and location.
Yes. When working offline in remote construction sites or basements, GPS coordinates, altitude, compass tilt, and SHA-256 Proof ID stamping continue to function flawlessly. True-scale A4 ID card rendering and offline OCR to Word also execute 100% on-device.
No. Proof requires no account creation, no sign-in, and no personal email or phone registration. Simply download and start documenting your field work immediately.

Ready to Upgrade Your Field Documentation?

Experience the specialized 2-in-1 suite on your iPhone today. Free download on the App Store.

Free Download on App Store
Coming Soon
Android Release Google Play