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
Vampify - Turn into a Vampire
Vampify - The #1 Vampire face app!
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
156 ratings · Top 15%
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.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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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/
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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 Vampify - Turn into a Vampire: map the core Entertainment 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
Offer more diverse and customizable effects.
Assumption to check: Limited effects and transformations available.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize performance for faster results.
Assumption to check: Image processing can be slow.
Validate with people who use this workflow before building.
Hypothesis 3
Implement local processing to enhance privacy.
Assumption to check: Requires user to upload photos to a server.
Validate with people who use this workflow before building.
Hypothesis 4
Integrate more sharing options for social media.
Assumption to check: Lack of social sharing 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
Vampify - The #1 Vampire face app! USA TODAY - "I can't get enough of turning myself into an animated Vampire (Vampify), Werewolf (Wolfify), [or] Zombie (Zombify)" - Jennifer Jolly Come back to life as a 3D animated vampire! Your immortal self will blink, snarl, bite, grow fangs and more. You'll scare the pants off your friends and family with Vampify's frighteningly realistic bloody effects and animations. Trust us, it's simply FANG-tastic! NOW BECOME A DAYWALKER! - Get Wolfify and Vampify to unlock the Daywalker effect in Wolfify SHARE VIDEOS and PHOTOS - Sophisticated, realistic face-morphing technology will make your Vampify videos scarier than horror films! - Easily share photos and videos with MMS, Instagram, YouTube, Twitter, Facebook, and Email. WANT MORE?! - Upgrade to burn your vampires with sunlight, add bloody tears, smoke explosions and other fun effects! Who will YOU bite? Follow along with us on Instagram at @apptly and share your SCARIEST creations using #vampify. WARNING: Don't use Vampify in the daylight! (just kidding... you can)
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
Zustand
react-navigation
expo-image-picker
expo-sharing
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.
