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
Little Tiger: Firefighter Kids
In this app, children can experience many exciting adventures with a fire truck, a spaceship, and a submarine
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.2
656 ratings · Top 30%
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 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.
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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 Little Tiger: Firefighter Kids: 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
Regular updates with new games and features to retain user interest.
Assumption to check: Limited content variety leading to quick user disengagement.
Validate with people who use this workflow before building.
Hypothesis 2
Clear pricing and value communication for purchases.
Assumption to check: In-app purchases can be confusing or misleading.
Validate with people who use this workflow before building.
Hypothesis 3
Incorporate more educational content to enhance learning.
Assumption to check: Lack of educational depth in games.
Validate with people who use this workflow before building.
Hypothesis 4
Add features for kids to share their achievements with friends.
Assumption to check: No social features for kids to share achievements.
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
In this app, children can experience many exciting adventures with a fire truck, a spaceship, and a submarine. Children have complete control over each vehicle and can even choose their own driver and co-driver. ▶ 4 cute, funny animals: panda, tiger, unicorn, and elephant. ▶ Super exciting interactive games and challenges. ▶ Stunning day and night scenes. PLAY WITH THE FIRE TRUCK • Become a firefighter and take the fire truck on tour • Put out fires with your finger • Rescue the cat from the tree • Clear obstacles from the road using the crane FLY WITH THE SPACESHIP • Ready, set, go: Launch your rocket into space • Assemble your crew • Head for undiscovered planets and collect stones, hearts, and diamonds using the crane • Activate the super boost and discover new planets DIVE THE SUBMARINE • Go water-skiing and show off your cool jumps • Race your boat over boat jumps • Relax during a round of fishing • You can convert the boat into a submarine: go on an underwater adventure. Dear parents, children, siblings, uncles, aunts, and grandparents! We hope you will enjoy our app! Many young and slightly older testers have helped us to make this app great fun for young and old. This app can help children especially with: ▶ Refining their motor skills: Skillfully guide the fire hose with your finger so that the water jet hits the fire. ▶ Promoting logical thinking: Which tool should I use to lift the tree off the road? ▶ Developing their patience and imagination: What planets should I visit to get stars, hearts, and stones for my spaceship? WHAT ELSE? ▶ No advertising ▶ No in-app purchases ▶ No text, no pop-ups, easy navigation for children ▶ No time limits, no high-scores, no nonsense: just play time. ▶ For children from 3-7 years. Let us know what you think: fb.com/wonderkind twitter.com/_wonderkind
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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
@react-native-reanimated
expo-constants
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.
