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
Dr. Panda Mailman
**Winner of a Parents' Choice Gold Award for 2015!** Be a mailman and deliver mail as you explore a huge, interactive world!
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.2
129 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.
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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/
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 Dr. Panda Mailman: 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
Add more diverse educational games and topics.
Assumption to check: Limited content variety and activities
Validate with people who use this workflow before building.
Hypothesis 2
Simplify navigation structure with clearer labels.
Assumption to check: Some users find navigation confusing
Validate with people who use this workflow before building.
Hypothesis 3
Provide clearer information about what users gain from purchases.
Assumption to check: In-app purchases can be unclear
Validate with people who use this workflow before building.
Hypothesis 4
Implement gamification strategies to keep kids engaged.
Assumption to check: Children may lose interest quickly
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
**Winner of a Parents' Choice Gold Award for 2015!** Be a mailman and deliver mail as you explore a huge, interactive world! Take hold of the handlebars and get ready to ride in Dr. Panda Mailman! Explore a world filled with mountains, houses, rivers, forests and more as you deliver mail to over 10 animals—all with their own unique personalities! Create your own postcards, make sure the packages are wrapped up, and bring them wherever they need to go! Dr. Panda Mailman is an app designed for kids where they can drive a scooter in a large, varied environments and role-play as a mailman. There are no rules or end-points in the game, and it encourages imagination and story making. Dr. Panda Mailman has easy-to-use and kid-tested controls that makes it both intuitive and fun to ride around, do tricks, and explore! ***Winner of a Children's Technology Review Editor's Choice Award! Key features: - 4 big areas to discover—Mountain, Village, Forest and Fields - Over 10 animals, all with unique behaviors, habits and schedules! - Tons of interactive events- push boxes into a roaring river, make ducks fly away as you drive towards them, do tricks over ramps and more! - Paint your own postcards and make your own packages! - No rules, points or timers! Explore however you’d like, go off the beaten path and explore! - A huge world with no load times! - No in-app purchases - No third party ads Privacy Policy As a designer of kids’ games, we understand how important privacy is in this modern, digital world. You can read our privacy policy here: http://www.drpanda.com/privacy About Dr. Panda Dr. Panda is a developer of games for kids. We develop games with educational values that help kids learn about the world. All of our games are safe and do not contain inappropriate content. If you’d like to know more about us and how we design games for kids, visit our website www.drpanda.com/about. If you have any questions, feel free to send us an email at [email protected] or contact us on Facebook (www.facebook.com/drpandagames) or Twitter (www.twitter.com/drpandagames) or Instagram (www.instagram.com/drpandagames).
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
React Navigation
Zustand
Firebase
React Native Maps
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.
