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
Spelling Notebook Premium
Create a personalized list of words to practice
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
127 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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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/
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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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Spelling Notebook Premium: 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
Enhance user experience by providing a larger word library and customizable spelling lists.
Assumption to check: Limited word database and customization options
Validate with people who use this workflow before building.
Hypothesis 2
Implement features that cater to different learning preferences (visual, auditory, kinesthetic).
Assumption to check: No support for learning styles
Validate with people who use this workflow before building.
Hypothesis 3
Integrate gamification elements like rewards and challenges to keep users engaged.
Assumption to check: Lack of gamification and motivation features
Validate with people who use this workflow before building.
Hypothesis 4
Provide detailed analytics and reports on user progress over time.
Assumption to check: Difficulty in tracking long-term progress
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
Create a personalized list of words to practice. Test your spelling - hear each word spoken. Get a star for each correct word. Practice just the words you have yet to master. Retest your words at anytime. Students can practice their words independently. Originally designed to be a replacement for a student's spelling notebook which lists words to be learnt for school each week. Unlike a paper notebook, SpellingNotebook can speak each of the words to enable testing and practice without seeing the written word. SpellingNotebook contains a full searchable spelling dictionary so that words can be added directly to the student's word list, minimizing entry errors. User Reviews * This app is awesome I have a spelling test coming up and I can spell every word correctly thanks to this app!!! (US) * Makes spelling practice fun (UK) * So fun!!!! This is a great app for kids and adults! (US) * Great App!!! Whole class uses it!! (Australia) Spelling Notebook features: * Students can practice independently * More than 100,000 words - add new words to the built in spelling dictionary when needed * Spelling Notebook has a built in voice that can say all words in its extensive dictionary and any new english words added * Optionally Record your own voice for the word you want to practice. You can record just the word, or even a whole phrase to help you recognize which word to spell. * Multiple English regions: UK, US, Canada, Australia and NZ * Earn a star for correct words * Keep multiple word lists * Edit word lists: add or delete words, add or delete an entire word list, rename your list * Import words from one wordlist into another * Words are selected from an extensive dictionary - minimizing entry errors * Help available in app to guide and support * Word list Copy and Paste * History of Word list tests and practice * Email test results * Unlimited words per list * Select between UK, US and Australian voices The built-in spelling dictionary is automatically selected by region. For countries outside US, Canada, Australia and NZ, the UK spelling dictionary is selected. Spelling Notebook Premium offers a premium Spelling Notebook experience with no ads on any device, unlimited words per wordlist and a selection of UK, US and Australian voices. Follow us on Instagram: @spellingnotebook Recommended Ages: All, Kids Categories: Education, Productivity, Apps for Kids
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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.
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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.
