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
HitchCal: Rotation Calendar
HitchCal shows your rotation - and tells your family when you're home.
$2.99 · In-app purchases
PRICE
$2.99
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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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included15 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 HitchCal: Rotation Calendar: map the core Productivity 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
Allow users to create custom roles and recurring shifts.
Assumption to check: Limited customization options for shifts
Validate with people who use this workflow before building.
Hypothesis 2
Implement push notifications for upcoming shifts.
Assumption to check: No reminders for upcoming shifts
Validate with people who use this workflow before building.
Hypothesis 3
Add themes and customizable layouts for better user experience.
Assumption to check: User interface may be too simplistic
Validate with people who use this workflow before building.
Hypothesis 4
Enable sync with Google Calendar or iCal for better planning.
Assumption to check: Lack of integration with external calendars
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
HitchCal shows your rotation - and tells your family when you're home. NO SUBSCRIPTION. Pay once, yours forever. No ads, no account, no signal needed. ANY ROTATION, FOREVER • 14/14, 14/7, 20/10, 30/30, 7/7 - or build your own X-on / Y-off • Day and night swings within one hitch, color-coded • Projects years ahead and NEVER breaks at the new year • Pick a preset or set custom on/off days - no fiddly setup WHEN AM I HOME? • Big countdown: days until home, or days until crew change • Widgets: the countdown on your home screen AND lock screen • Tap any day to see exactly what it is • Color-coded month: on hitch, night shift, home - one glance NEVER MISS A CREW CHANGE • One switch: HitchCal rings at 6 pm the evening before every change • "Hitch starts tomorrow - pack tonight" and "Home tomorrow" • Works with no signal - alerts are set right on your phone SHARE WITH FAMILY (the part people love) • Send your hitch by Messages, Mail or AirDrop • It drops straight into your partner's calendar app • They always know when you're back - no more guessing the dates BUILT FOR THE FIELD • Big, high-contrast days readable at arm's length • Pickers, not typing - works with gloves on • 100% offline, your schedule never leaves your phone For oilfield, offshore, FIFO mining, tanker and merchant-marine crews - anyone who works a rotation and just wants to know when they're home.
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.
SUGGESTED BUILD STACK
React Navigation
React Native Calendars
Axios
React Hook Form
Expo
BUILD KIT DIFFICULTY
Intermediate
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.
