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
Video Calls with Tooth Fairy
* #1 TOOTH FAIRY APP ON ITUNES *
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
48 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.
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included18 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 Video Calls with Tooth Fairy: map the core Lifestyle 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
Allow users to customize fairy appearance or voice.
Assumption to check: Limited customization options for calls.
Validate with people who use this workflow before building.
Hypothesis 2
Introduce bundled calls or subscription plans.
Assumption to check: High price for a single call.
Validate with people who use this workflow before building.
Hypothesis 3
Implement push notifications for upcoming calls.
Assumption to check: Lack of reminders for scheduled calls.
Validate with people who use this workflow before building.
Hypothesis 4
Add a rating and feedback system post-call.
Assumption to check: No user feedback mechanism.
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
* #1 TOOTH FAIRY APP ON ITUNES * * FROM THE MAKERS OF #1 CHRISTMAS APP "VIDEO CALLS WITH SANTA" * * NO HIDDEN COSTS, BUY IT ONCE, USE IT FOREVER * * CALLS ARE AUTOMATICALLY VIDEO RECORDED * * PROCEEDS BENEFIT THE NATIONAL CHILDREN'S ORAL HEALTH FOUNDATION * * SIMPLE TO USE, NO SET-UP REQUIRED, JUST DOWNLOAD AND START CALLING * * CREATE THE PERFECT MEMORY OF WHEN KIDS LOSE THEIR TEETH * * HELPS KIDS WANT TO BRUSH TEETH, GO TO DENTIST, AND MUCH MORE * Why settle for a boring old phone call with the Tooth Fairy, when you can have a super-cool INTERACTIVE VIDEO CALL with her instead?! Choose from three amazing pre-recorded, interactive video calls right after download. Three additional calls are available through in-app purchase. "Video Calls with Tooth Fairy" is a fun new app that lets you have realistic video chats with the Tooth Fairy any time you want! Even very young children love actually seeing the Tooth Fairy as she talks directly to them! Choose from six pre-recorded interactive calls about loose teeth, lost teeth, brushing your teeth, going to the dentist, and much more! HOW IT WORKS: Just select a call and start speaking with the Tooth Fairy! Whenever you're done answering a question, tap anywhere on the screen, and she will say his next line of dialogue. Calls are automatically video recorded! It’s that easy! *** WATCH YOUR KIDS GO NUTS! ***
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
Supabase
React Navigation
Date-fns
React Native Paper
BUILD KIT DIFFICULTY
Intermediate
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.
