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
Train Picturebook for Toddlers
100 Things: Trains Picturebook - for babies, small kids & toddlers - delivers 100's of beautiful HD photos & videos of choo choo trains teaching about this transport that’s been around since 1825, long before Thomas &...
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
2 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included15 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 Train Picturebook for Toddlers: map the core Books 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 interactive elements like sounds and animations.
Assumption to check: Limited interactivity in current books
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize their reading experience.
Assumption to check: Few customization options for users
Validate with people who use this workflow before building.
Hypothesis 3
Implement sharing options for books with friends or family.
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Regularly update the library with new books and themes.
Assumption to check: Lack of variety in book selection
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
100 Things: Trains Picturebook - for babies, small kids & toddlers - delivers 100's of beautiful HD photos & videos of choo choo trains teaching about this transport that’s been around since 1825, long before Thomas & Friends or Chuggington! All aboard! Your little conductor will love 100 trains, featuring steam engines, locomotives, box cars, coal cars and railway crossings that will help your child learn more about this form of transportation that has been around since 1825, long before Thomas and Friends or Chuggington! Come work along the railroad with this fun educational app for your kids and babies from 100 Things! TODDLER VIDEO PLAY • Swipe left or right to move to the next photo or video • 100+ stunning HD photos & videos • HD-quality resolution and sound • Sound clips matching the images - tap to hear the sound! • Simple, intuitive user interface • All photos/videos native to the app (no data charges), no wifi or data needed to watch videos! We regularly update all our apps with fresh content for our users. Please keep checking the updates tab on the app store in order to make sure you’re enjoying all the latest additions to our application. -= MORE 100 THINGS APPS AVAILABLE =- The entire 100 Things Apps collection of video apps was created by parents of two rambunctious toddlers. All content has therefore been thoroughly evaluated, critiqued and improved upon and received two sticky thumbs up! Check out the other 100 Things Apps including: 100 Diggers, 100 Farm Animals, 100 Planes, 100 Zoo Animals, 100 Tools, 100 Horses, 100 Matching Games plus more. -= TATTLE ON US =- Please rate and write a review for 100 Things Apps if your toddler loves it as much as ours. For questions, concerns, bug reports, or improvements, please write directly to us via the app's Parents Zone or: Email: [email protected] Facebook.com/100thingsapp YouTube.com/100thingsapp
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
Expo-AV
React Navigation
TypeScript
BUILD KIT DIFFICULTY
Starter
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.
