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
Pettson's Inventions 3
in the third game about pettson’s inventions you get to explore pettson and findus farm while completing even more of their amazing inventions.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
13 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
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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 Pettson's Inventions 3: map the core Education 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
Implement full offline mode with downloadable puzzles.
Assumption to check: Limited offline functionality
Validate with people who use this workflow before building.
Hypothesis 2
Introduce more varied puzzles and challenges.
Assumption to check: Repetitive gameplay
Validate with people who use this workflow before building.
Hypothesis 3
Offer more affordable subscription tiers.
Assumption to check: High price point for full access
Validate with people who use this workflow before building.
Hypothesis 4
Add social sharing and collaborative features.
Assumption to check: Limited user engagement 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
in the third game about pettson’s inventions you get to explore pettson and findus farm while completing even more of their amazing inventions. enjoy 36 brand new inventions divided into 6 different areas, each with it’s own unique theme. construct a ferris wheel in the woodshed, create an egg-painting machine in the henhouse or build a wake-up invention by combining an apple, a dog and some paint! look for the missing bike parts and see if you can complete the final mission, to fix pettson’s bike! drag and drop the items onto the unfinished invention and put them in the right place. press play and see what happens! follow pettson’s instructions and help him to finish all inventions. the simple interface combined with challenging tasks makes this game appealing for both kids and parents who are interested in learning more about physics and creativity. pettson’s inventions 3 is a pedagogic app that practices logic and stimulates creativity for preschoolers. - 36 brand new amazing inventions - 6 fantastic areas - voices in english, german and swedish - original artwork from the creator of pettson, sven nordqvist - kid friendly interface - no in-app purchase - no ads - choose to play with or without fake objects to adjust the difficulty level check out pettson’s inventions 1 & 2 for more amazing inventions to complete.
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
Axios
React Navigation
React Native Paper
Expo Notifications
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.
