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
Endless Alphabet
** 2013 App of the Year Runner-Up **
$8.99 · In-app purchases
PRICE
$8.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
1,415 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.
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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's included16 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 Endless Alphabet: 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
Offer additional letters/characters through in-app purchases.
Assumption to check: Limited letter selection may frustrate users looking for more content.
Validate with people who use this workflow before building.
Hypothesis 2
Improve stability and performance of animations.
Assumption to check: Some users report bugs with animations not playing.
Validate with people who use this workflow before building.
Hypothesis 3
Implement a feedback form within the app.
Assumption to check: No feedback mechanism for users to suggest new features.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a subscription model with a free trial.
Assumption to check: High one-time cost may deter new users.
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
** 2013 App of the Year Runner-Up ** ** App Store's Editor's Choice ** *From the team at Originator - the creators of Sesame Street's Monster at the End of This Book, and Another Monster at the End of This Book. Originator is a team of passionate artists and engineers dedicated to the best education+entertainment apps for kids. We hope you enjoy playing with Endless Alphabet as much as we enjoy making it.* Set the stage for reading success with this delightfully interactive educational app. Kids will have a blast learning their ABC's and building vocabulary with the adorable monsters in Endless Alphabet. Each word features an interactive puzzle game with talking letters and a short animation illustrating the definition. Before you know it, your child will be using words like gargantuan and cooperate! **NOTE: You must be online and have ample disk space the first time you run the app so that all words are downloaded and can be played. ** Features: - 100 words to learn and play with. - Delightful animations teach children the definitions of the words in a fun and engaging way. - Word game teaches children letters. - 3D Touch on iPhone 6s and iPhone 6s Plus makes letters and words react in an extra special way! - Endless Alphabet was designed with your children in mind - there are no high scores, failures, limits or stress. Your children can interact with the app at their own pace.
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
expo-av
react-native-reanimated
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.
