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
Zulu Alarm
Set reliable alarms in Zulu (UTC/GMT) time with precision and simplicity!
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 ratings · Top 5%
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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Zulu Alarm: map the core Utilities workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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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.
Hypothesis 1
Provide more personalization features for alarm settings like snooze duration and sound selection.
Assumption to check: Limited customization options for alarms
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to sync trips and alarms with calendar apps for better organization.
Assumption to check: No integration with calendar apps
Validate with people who use this workflow before building.
Hypothesis 3
Focus on a cleaner design with fewer distractions and clearer actions.
Assumption to check: User interface may feel cluttered
Validate with people who use this workflow before building.
Hypothesis 4
Implement a notification system to remind users of upcoming alarms.
Assumption to check: Lack of reminders for upcoming alarms
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Set reliable alarms in Zulu (UTC/GMT) time with precision and simplicity! Stay on schedule with Zulu Alarm—UTC/GMT alarms for pilots, flight attendants, aviation crews, and frequent travelers. Receive alerts on iPhone and Apple Watch! Built for iOS 26 with full support for the latest system features, Zulu Alarm ensures your alerts are always on time. Alarms created on your iPhone will also alert on your Apple Watch when your phone is locked, so you never miss a check-in, departure, or crew rest reminder. And upcoming alarms show a live activity so you can see how much time until upcoming alarms right from your lock screen! Designed for pilots, flight attendants, aviation crews, and frequent travelers, Zulu Alarm makes it easy to schedule alarms based on the universal aviation standard. Whether you’re planning flights, managing schedules, or just prefer to live on UTC, this app keeps you synced. Features: Create alarms in Zulu time (UTC/GMT) within the next 24 hours Clean, professional interface for fast setup in light or dark mode Custom name each alarm iPhone + Apple Watch alarm alerts Live Activities so you can see upcoming alarms on your Lock Screen Alarms sound even if Focus Modes are set so you never miss an alarm Ideal for pilots, flight attendants, flight crews, and global travelers Always synced to the worldwide aviation standard Stay sharp. Stay on schedule. Stay on Zulu.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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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.
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BUILD KIT DIFFICULTY
Starter
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.
