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.
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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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for SignNow: e-Signature app: map the core Productivity workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
SignNow is used by over 6 million people worldwide to sign, send, and manage documents — wherever they are, on any device. Skip printing, scanning, and waiting. With SignNow, you can get legally binding e-signatures in minutes. SIGN & SEND DOCUMENTS • Sign PDFs, Word files, and other formats in just a few taps • Send documents to one or more recipients via email or link • Set the signing order and assign roles • Get notified in real time when documents are opened or signed • Collect in-person signatures with Kiosk Mode — ideal for events, front desks, or check-ins FILL & EDIT DOCUMENTS • Fill out forms, add text, checkboxes, dates, and stamps • Convert images (JPEG, PNG, BMP, etc.) into PDFs • Import files from email, Google Drive, Dropbox, OneDrive, and more • Create reusable templates for documents you send often MANAGE YOUR DOCUMENT WORKFLOW • Collaborate with your team on shared documents • Track document status and view detailed audit history • Organize files into folders for quick access • Store all signed documents securely SECURITY & COMPLIANCE • 256-bit encryption for data in transit and at rest • Legally binding e-signatures compliant with ESIGN, UETA, and eIDAS • Detailed audit trails with timestamps, IP addresses, and signer info • Works offline — sign and edit documents without internet, sync when back online • Supports MobileIron AppConnect for enterprise-grade security MORE WAYS TO WORK • Sign in with your Google or Apple account • Access documents from mobile or web • Print documents directly from the app • Use widgets for quick access to key actions Start with a free 7-day trial — no credit card required. SUBSCRIPTION INFORMATION Payment will be charged to your iTunes account upon confirmation. The subscription automatically renews unless auto-renewal is turned off at least 24 hours before the end of the current billing period. Manage your subscription in Account Settings after purchase. Privacy Policy: https://www.signnow.com/privacy_policy Terms of Service: https://www.signnow.com/terms
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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
Assumption to check: Limited free features compared to paid plans
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Occasional bugs during document upload
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Difficulties in signing long documents
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Notifications may not be timely
Validate with people who use this workflow before building.
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.