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.
**Winner - 2017 Mom’s Choice Awards**
$1.99 · 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.
Your first Build Kit is free with a verified email.
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 Bob Books Spin and Spell: 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 content variety for advanced users
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Subscription model can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of social features
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: In-app ads can disrupt learning
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.
**Winner - 2017 Mom’s Choice Awards** **Winner - 2017 Tillywig Brain Child Award** Bob Books, America’s #1 learning to read program, is proud to present the newest addition to their best-selling series of learning-to-read apps for 3-5 year olds, Bob Books Spin and Spell. Bob Books brings reading to life by helping children make early connections between letters, sounds, spelling, and reading words. In the Spin and Spell app, players spin letters on a dial to complete a two- or three-letter word. Early readers distinguish between beginning, middle and ending word sounds and letters. Spin and Spell offers three levels of activities. Bob Books Spin and Spell is designed to introduce early readers to word families, and make spelling easier and more intuitive through connecting words and sounds. Repetition, picture-word association, and focusing on specific parts of the word all contribute to giving new spellers tools for success. FEATURES Players spin the dial to complete a word, focusing on either the beginning, ending or middle sound. Every word that players spell successfully colors in a new picture on their word list. After players spell three different rhyming words, a new word family is introduced. Through breaking words down into their beginning and ending sounds, players will master spelling 50 new words. Bob Books Spin and Spell will show your child how to: -Make the connection between letter shapes, words and sounds. -Read and sound out simple words. -Spell the words they’ve read. WHY BOB BOOKS? Bob Books Reading Apps follow the same method and principles as the #1 best-selling Bob Books series. Bob Books were created to lead children to the ah-ha moment when letters first turn into words. Bob Books is committed to bringing children a satisfying, successful first reading experience, with easy first steps, wholesome values, authentic hand-drawn illustrations, and beautiful full-color animations. This is the fourth app in the Bob Books series, which has been downloaded over 3 million times from the App Store. By slowly introducing new words in context, using consistency, repetition and stories that fit short attention spans, your child will quickly find his or her own ah-ha moment. This is the reading magic of Bob Books. Soon your child will join millions of children who can proudly say, “I read the whole book!”® For more information about Bob Books, visit https://bobbooks.com Bob Books respects your privacy! We do not collect, store, or share any personal information or location data. All our apps are ad free, without in-app purchases and are safe for young children. Read more at: https://bobbooks.com/privacy-policy *** We love getting feedback from our users. If you have questions or comments, please send them to [email protected]. If you love our app, please help spread the word by leaving us a nice review in the app store. ***
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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.
Not assessed in a Build Kit yet.
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.