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
Ink Cards: Send Custom Cards
*Featured in the App Store for Making Family Memories and Photo Projects*
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
41,653 ratings · Top 5%
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
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included17 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.
JavaScript is required to complete mailbox verification.
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 Ink Cards: Send Custom Cards: map the core Photo & Video workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Continue in Rork >
Affiliate link: CloneChart may earn a commission at no extra cost
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
Offer a broader range of templates and allow user-generated designs.
Assumption to check: Limited template options can lead to repetitive designs.
Validate with people who use this workflow before building.
Hypothesis 2
Provide more affordable pricing options or ad-supported free features.
Assumption to check: High cost of in-app purchases for premium features.
Validate with people who use this workflow before building.
Hypothesis 3
Partner with local printing services for faster delivery.
Assumption to check: Long shipping times for physical cards.
Validate with people who use this workflow before building.
Hypothesis 4
Improve photo picker with better organization and search functionality.
Assumption to check: Difficulties in photo selection can frustrate users.
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
*Featured in the App Store for Making Family Memories and Photo Projects* *Rated Best Photo Quality by Digital Photography Review* Mail REAL one-of-a-kind cards without a trip to the store! Create cards right from your iPhone or iPad and send them straight to your lucky recipient’s mailbox. And now, you can let us do the writing with our newest feature, MagicMessage™! Just tell us their name, the occasion and other detail you’d like and watch the magic happen! For a more personalized touch, use our NEW RealScript® technology. Choose real handwriting options for your cards and envelopes for a true pen-to-paper style! Upgrade to a premium card and embossed envelope or order packs of personalized cards, ideal for holiday photo cards and thank you cards. Customizable cards for every occasion: - Holidays - Thank You - Birthdays - Grandparents - Babies - Weddings - Graduations - Travel - Invitations - Valentine’s Day - Easter - Father’s Day - Mother’s Day - Anniversary & Love - Thinking of You - Get Well Soon - Congratulations - Thanksgiving Ink Cards are printed on thick, glossy 5x7-inch cardstock at a resolution of 300 dpi. (That’s printing-nerd-speak for “super detailed on really nice paper.”) And they cost just $2 each (with free postage)! Upgrade from postcard-style to a premium card to mail a thicker, matte card in an envelope. You can even make your card extra special by adding a gift card for virtually any special occasion! Choose from dozens of brands and restaurant gift cards. Purchase with Apple Pay, PayPal or scan your credit card at checkout. You create. We deliver. - Cards are delivered to the U.S. and Canada in 3-7 business days and to anywhere else in the world in one to three weeks. - Card packs are delivered in just days to anywhere in the U.S. - Receive email and push notifications to know when your card has been ordered and shipped. - SATISFACTION GUARANTEE: You are going to love Ink Cards. We guarantee it. One card and you'll be hooked! And your recipient will love your personalized greeting just as much. In fact, we guarantee that every card you make will be perfect – or your money back. Our app is FREE to download. We can’t wait for you to make someone’s day! ----- Contact Us ----- We’d love to hear from you! https://www.sincerely.com/contact
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
< Scroll to see more >
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
Supabase
React Navigation
Expo Image Picker
Zustand
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.
