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
Pacing Guard: Interval Timer
Pacing Guard helps people with ME/CFS, Long COVID, fibromyalgia, and chronic fatigue follow structured activity-rest routines - without watching the clock.
$1.99 · In-app purchases
PRICE
$1.99
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/
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 Pacing Guard: Interval Timer: 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
Simplify the setup process with guided steps or preset templates.
Assumption to check: Users often find interval timers too complex to set up.
Validate with people who use this workflow before building.
Hypothesis 2
Integrate social features for challenges or share results.
Assumption to check: Lack of motivation to stick to the intervals.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance reliability with robust notification settings.
Assumption to check: Timer notifications can be inconsistent.
Validate with people who use this workflow before building.
Hypothesis 4
Provide more detailed settings for interval variations and presets.
Assumption to check: Limited customization options for advanced users.
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
Pacing Guard helps people with ME/CFS, Long COVID, fibromyalgia, and chronic fatigue follow structured activity-rest routines - without watching the clock. Voice cues, haptic feedback, with optional support of a Bluetooth heart rate strap tell you when to go and when to rest. You focus on living. The app keeps the rest. TIMER • Customizable GO and REST intervals (5 to 120 seconds) • Voice announcements at each phase transition • Countdown alerts in the final 5 seconds before switching • Haptic feedback and sound cues at phase changes • Smooth visual progress ring with phase colour coding • Works in the background with screen off HEART RATE MONITORING • Connects to any Bluetooth heart rate strap (Polar, Garmin, Wahoo, and others) • Aerobic threshold calculator to find your personal safe HR limit • Voice and haptic alerts when approaching or exceeding your limit • Configurable repeat alerts so you stay informed without being overwhelmed • Periodic heart rate announcements at configurable intervals • Time above HR limit tracked for every session, even with alerts muted SLEEP MONITORING • Long-press Start for overnight heart rate tracking • No voice cues, no alerts - continuous silent recording • Session max HR saved to history SESSION INSIGHTS • Live stats during any session - tap the live stats button • Post-session HR chart with exceedance breakdown • 8-week trend analysis with sparkline charts • Monthly pacing calendar showing your compliance at a glance • Export session data as CSV • Save sessions to Apple Health as workouts PRIVATE & OFFLINE • No accounts, no ads, no tracking • No subscriptions or hidden costs • All data stays on your device • Works fully offline ACCESSIBLE • Full VoiceOver support with descriptive labels • Dynamic Type for all text sizes • Respects Reduce Motion preference • Minimum 44pt tap targets • High Contrast mode compatible --- Disclaimer: Pacing Guard is a general-purpose interval timer and self-management aid. It is not a medical device and does not provide medical advice, diagnosis, treatment, or disease prevention. The app does not make any claims about health outcomes. Heart rate monitoring is provided for informational purposes only. Any routines followed using this app are self-directed and used at your own discretion. Always seek advice from a qualified healthcare professional regarding any medical condition.
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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
react-navigation
expo-notifications
@react-native-async-storage/async-storage
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.
