Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
App Overview
Zap eSign-Scan & Sign PDF
Zap eSign is an e-Signature service that lets you scan documents, sign and send signed PDFs, contracts, agreements, and forms quickly without any hassle
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.2
4 ratings · Below Average
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included16 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Zap eSign-Scan & Sign PDF: map the core Business workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Implement better organization features like folders or tags.
Assumption to check: Limited functionality for document management
Validate with people who use this workflow before building.
Hypothesis 2
Create a modern, clean UI with better navigation.
Assumption to check: User interface feels outdated
Validate with people who use this workflow before building.
Hypothesis 3
Optimize camera features for better scanning accuracy.
Assumption to check: Inconsistent performance when scanning
Validate with people who use this workflow before building.
Hypothesis 4
Add options for sharing and collaborating on documents.
Assumption to check: Lack of collaboration features
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Zap eSign is an e-Signature service that lets you scan documents, sign and send signed PDFs, contracts, agreements, and forms quickly without any hassle. It works on all Apple devices and integrates readily with your everyday apps for a seamless signing experience. Welcome to a paperless world! Zap eSign is perfect for anyone who needs to sign business documents. primarily for Consultants, Freelancers, HR, Legal, Finance, and Sales functions. - Sign documents on the go. - Sign and send, secure and legally binding documents. - Save your signature and reuse them on all Apple devices KEY FEATURES: - Scan Documents - Sign Documents - Convert to PDF - Supported document types include pdf, jpeg, doc, png, and more. - Import files from other applications using the "Open In" functionality. - Add resizable signature, text, and notarization stamps initials, name, company, date, and annotations to the document. - Preview and make changes to the document using the document viewer. - Share completed documents through iMessage, Whatsapp, Email, and more. Documents that can be signed: - NDAs - Invoices - Sales contracts - Business proposals - Purchase orders - Lease agreements - Partnership agreements - Employment offers and more. Legal & Security - We do not store any data regarding the uploaded documents or signatures. Everything remains in your Apple ecosystem. Zap Credits - Pay only for the documents you sign, no subscriptions. All unused credits are retained and can be used to sign documents anytime.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
react-navigation
@react-native-async-storage/async-storage
expo-camera
TypeScript
BUILD KIT DIFFICULTY
Advanced
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.
