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.
"I have tried them all and this is my and my kids favorite tracing app bar none!"
$0.99 · 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 Little Writer - The Tracing App for Kids: 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 letter/number options for tracing.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Inconsistent feedback on tracing accuracy.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of engaging animations or sounds.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No progress tracking for users.
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.
"I have tried them all and this is my and my kids favorite tracing app bar none!" Endorsed by tens of thousands of satisfied parents, teachers, and kids the world over. Little Writer is a tracing app that's done just right. Little Writer is super fun and so easy to use that your kids will think letter tracing is a game vs. a boring chore. WHY PARENTS AND TEACHERS LOVE THIS APP ● The app is so easy to use that even toddlers will enjoy playing with ● The app is beautifully designed and just a joy to look at and use ● You can turn individual items ON or OFF and introduce one letter at a time based on the player skills ● You can customize everything - record your own language or add your own words ● Adding pictures and names of family and friends to write is a hit with every child ● The app also includes a collection of basic shapes to draw since handwriting require the same core skills ● The app comes preloaded with dozens of three and four letter words to write WHY KIDS WILL LOVE IT TOO ● This app is just FUN. ● Tracing the along the lines and collecting all the apples and fishes is a pure joy for every child ● Gorgeous graphics and cute sounds keep kids begging for more ● Kids love hearing everything in mommy's or daddy's voice ● The app is super easy to use for kids of all ages and abilities. WHATS INCLUDED ● ABC uppercase letters ● abc lowercase letters ● Numbers 1 to 10 ● 20 basic shapes including lines, circles, rectangles and more ● Dozens of 3 and 4 letter words to make practice more enjoyable and interesting ● Ability to add an unlimited number of your own words and pictures for maximum enjoyment and variety ● Additional letters for foreign language characters. Just go to settings to turn additional characters on and record their sound HEROIC SUPPORT Heroic Support is not just what we do. It's really what makes us, well, us. It's that drive to make a difference in your life - no matter how big or small. Really, it's our way of life because we want you to be our customer for a lifetime of fun and learning. Have questions? We are here to help. Email us at [email protected]
Written user reviews are not shown here. Check current App Store reviews >
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.