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
Nappuccino: Coffee & Power Nap
Recharge your brain in 20 minutes
$3.99
PRICE
$3.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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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A product spec, screen plans, and build steps for your coding agent.
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What's included
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.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Recharge your brain in 20 minutes. Nappuccino is a nap timer for Apple Watch that counts from the moment you actually fall asleep and wakes you gently before deep sleep makes you groggy. COFFEE NAP Drink a coffee, tap Coffee nap and lie down. Caffeine takes about 20 minutes to kick in, so you wake up just as it starts working. Studies found coffee plus a short nap beats either one alone. Or just say "Start a coffee nap in Nappuccino" to Siri. No Watch at hand? Start a coffee nap right on iPhone. The alarm rings even when your iPhone is locked or on silent. And you don't need to open the app to see how long you have left: the time is right on the Lock Screen and at the top of the screen. DETECT SLEEP Most nap timers start when you tap. Nappuccino watches your heart rate and stillness, notices when you really drift off and starts the nap from there. A 20-minute nap means 20 minutes of sleep, not 12 minutes of sleep after 8 minutes of lying awake. You choose how long you allow to fall asleep, so a nap never runs forever. WAKE UP BEFORE DEEP SLEEP • Smart wake: wakes you a little early if you're already in light sleep, never later than you set • Gentle alarm: haptics that slowly grow stronger, then a soft chime • Breathing wind-down: optional gentle vibrations pace slow breathing to help you let go YOUR RINGS STAY HONEST Naps are not recorded as workouts, so they don't add exercise minutes or calories to your Activity rings. Naps can be saved to Apple Health as sleep. LEARN WHAT RESTS YOU BEST Rate how you feel after each nap. The iPhone app shows how fast you fall asleep, when you nap, your heart rate during each nap and which nap length leaves you feeling best, then suggests it as your default. ALSO • Time left on the Lock Screen and in the Dynamic Island (Live Activity) • Watch face complication and Smart Stack widget • Siri, Shortcuts and the Action button on Apple Watch Ultra • Share card for your naps • Fixed timer mode for a classic countdown PRIVATE BY DESIGN No account, no ads, no tracking, no servers. Your naps stay on your Apple Watch and iPhone. Coffee nap works on iPhone with iOS 26 or later. Sleep detection, smart wake and heart rate need Apple Watch with watchOS 11 or later.
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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.
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.
SUGGESTED BUILD STACK
BUILD KIT DIFFICULTY
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.
