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.
The #1 alphabet tracing app for toddlers & pre-schoolers
$9.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for LetterSchool - Block Letters: 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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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
Assumption to check: Limited number of letters and lessons available for free users
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of personalized learning paths
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: In-app purchases can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Some users report issues with the tracing animation lag
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
The #1 alphabet tracing app for toddlers & pre-schoolers. Recommended and used by parents, teachers, and occupational therapists. Loved & played by more than 2 million toddlers and used at more than 5.000 schools! LetterSchool is an educational app designed to help every child play and learn how to write all letters of the English alphabet (from A to Z) and numbers from 1-10. Kids practice and develop essential phonics and handwriting skills as they play three exciting games per letter or number – as an extra, they learn words associated with the letters! HOW IT WORKS: Intro - Discover the shape, phonics, name, and sound of all the 26 block / print letters and numbers (1-10). Tap - Learn where to start to write the letters and numbers and finish by tapping the dots in the correct order. Trace - Learn the letter trajectory and direction of lines by tracing it. Write - Test your knowledge by writing the ABC and numbers from memory! SPECIAL FEATURES: - Uppercase and lowercase block letters + numbers 1-10! - Two exciting levels: Silver and Gold (with new animations)! - Progress and settings stored for up to three players on the same device. - In the A-Z section, specific graphics available to match the letters (e.g. ant graphic for letter A/a). - Available for both iPads and iPhones. - Special edition for schools and teachers. - Available in bulk through the Volume Purchase Program. - Available at a reduced price for educational institutions: 50% off for 20+ units! PERFECT FOR KIDS: Kids want to have fun, and LetterSchool offers an educational journey with the most engaging and entertaining educational material! - They learn with various exciting animations, graphics, and sound effects. - They learn to associate letters with words, learn and memorize tracing directions and the correct formation of each character. - Perfect for home-schooling kids and kindergartens. A user-friendly app for children with special educational needs. PERFECT FOR PARENTS & TEACHERS: - Choice of the three most popular typefaces in handwriting education (Handwriting Without Tears, D’Nealian, and Zaner-Bloser). - Two levels, where Golden Level allows tracking kids’ progress by displaying their exact letter writing! - Engaging and compelling game mode prompting the child to trace a letter or a number 3 times using different parameters (each step is more challenging). - An educational app created together with parents and educational professionals. - NO ADS! - Advanced settings or purchases only accessible by an adult! - Extremely committed Customer Support ready to answer all questions and fix any issues. MONTESSORI MATERIALS & METHODS: LetterSchool is crafted with the greatest care for preschool kids & toddlers. Parents, teachers, and occupational therapists can use LetterSchool independently, but schools that teach according to the Montessori principle can use LetterSchool as a source for their Montessori materials and methods as well. ACCOLADES: - ‘Best Mobile App of 2018 Platinum Award’ nominee! – BMA - Winner of 'National Parenting Product Awards 2018' - NAPPA Awards - Teachers With Apps Certified – TeachersWithApps - “Learning a letter on this app is like being on a great party, with disco lights, stars and fireworks. Every letter is a surprise!” – Apps4Kids - “The kids love it! This app is right on track to help my son to be better prepared for Kindergarten”. -Kidz LET'S PLAY & LEARN! Join LetterSchool on this exciting educational journey! Download the app and allow your toddler to discover the magical world of letters and words. Before you know it, your child or pupil will be writing the entire English block alphabet! For more reviews and information, visit our website www.letterschool.com If you have any question or suggestions, please contact us at [email protected]. You can also check our FAQ page on www.letterschool.org/faq.
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.