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
FitToCal - Workout Calendar
Every workout day shows up on your calendar
$0.99 · In-app purchases
PRICE
$0.99
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 included16 files
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.
// RORK SYSTEM PROMPT
Rork plan preview for FitToCal - Workout Calendar: map the core Health & Fitness 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
Integrate more advanced analytics and reporting.
Assumption to check: Limited workout tracking features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Add social features for users to share workouts and compete.
Assumption to check: No social features or community engagement
Validate with people who use this workflow before building.
Hypothesis 3
Provide customizable workout templates and routines.
Assumption to check: Lack of workout templates or customization
Validate with people who use this workflow before building.
Hypothesis 4
Implement push notifications for upcoming workouts and reminders.
Assumption to check: Inadequate reminders or notifications for scheduled workouts
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
Every workout day shows up on your calendar. Your Apple Health activity is added as a calendar event, so a filled calendar keeps you moving — blank days don't. #1 Paid Health & Fitness app in Korea · Top 21 overall (Feb 2026) Apple doesn't officially connect your workouts to the Calendar app. FitToCal fills that gap. ------------------------------ Features ------------------------------ - Background sync Yesterday's workout is already on today's calendar — no need to open the app. - Full Apple Watch support Runs, swims, and indoor workouts tracked on your Watch are all recognized. - Apple Calendar & Google Calendar Both are supported. Configure it per workout type. - Separate calendars per workout type Running, strength, swimming — each on its own color-coded calendar. See your pattern at a glance. - Filter by workout type Tap a chip at the top of the list to see just the workouts you want. - Daily summary mode Collapse a day's workouts into one clean calendar entry. - Import past workouts Fill your calendar with anywhere from 1 week to 1 year of past workouts. ------------------------------ FAQ ------------------------------ Q. Does it work with apps other than Apple Health? A. Apps connected to Health (Nike Run Club, Strava, Hevy, and more) sync automatically through Health. Q. How do I get workouts added automatically? A. Grant Apple Health and Calendar access after installing — then it records every day. Q. Both Google and iPhone Calendar at once? A. Yes. You can configure it per workout type. Q. Can I import past workouts? A. Yes — up to a full year at once. ------------------------------ Who it's for ------------------------------ - Anyone who wants to manage workouts on their calendar - Anyone who wants to look back on months or a year of activity - Apple Watch users who log a variety of workouts - Productivity fans who use time blocking / time tracking ------------------------------ Privacy ------------------------------ Your workout data is never sent to an external server. FitToCal connects Health and your calendar directly on your device. ------------------------------ You already did the workout. Now make sure it counts.
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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 Native
Expo
Zustand
expo-calendar
react-navigation
TypeScript
BUILD KIT DIFFICULTY
Advanced
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.
