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.
Solid Joys puts a full year of daily devotionals in your pocket, with no account and no ads.
Free · 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 Desiring God ft. Solid Joys: map the core Reference 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: Lack of offline access to devotionals
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited content categories
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Basic audio player functionality
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No user customization options
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.
Solid Joys puts a full year of daily devotionals in your pocket, with no account and no ads. Every reading is built right into the app, so you can open it and read or listen anywhere, even with no signal. On a plane, on a commute, in the mountains, or first thing in the morning before the day rushes in — your devotional is already there. WHAT YOU CAN DO • Read offline — all 365 daily devotionals are built in and ready with no connection needed. • Listen anywhere — every devotional is narrated by John Piper, with background playback and lock-screen controls, so you can listen with your screen off. • Start in seconds — no sign-up, no login, no account. Just open it and read. • Read any day, in any order — today's devotional, last week's, or one from months ago. • Open links instantly — tap a Solid Joys link from a friend or from Desiring God, and it opens right here in the app. • No ads, no in-app purchases. WHAT IS SOLID JOYS? Solid Joys is a daily devotional written and read by John Piper. These short, substantive readings are drawn from decades of his preaching and writing, and each one takes only a few minutes. That is all it takes to reset your whole day around the greatness of God. Every devotional points you to a passage of Scripture and helps you see and savor what God is really like. The aim isn't merely information, but joy: to feed your joy in Jesus every day of the year. WHO IT'S FOR • Anyone longing for a simple, faithful daily rhythm in God's Word. • Longtime readers of Desiring God and John Piper as well as anyone meeting him for the first time. • Readers who want their devotional to travel with them, online or off. ABOUT DESIRING GOD Desiring God exists to help people everywhere embrace a passion for the glory of God and the good of all peoples through Jesus Christ. For more than three decades, John Piper's Solid Joys has helped readers start the day grounded, focused, and glad in God. This is just the beginning — more is being built into the app. For now, we'd love for Solid Joys to become part of your every day.
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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.