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
The Standard Timer
The Standard Timer was specifically and specially designed for use in specialty gyms
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
2 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 The Standard 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
Allow users to create custom timer presets with different names and durations.
Assumption to check: Limited timer customization options.
Validate with people who use this workflow before building.
Hypothesis 2
Integrate options to share timer results on social media.
Assumption to check: No social sharing features for workout times.
Validate with people who use this workflow before building.
Hypothesis 3
Implement customizable alerts to notify users when timers expire.
Assumption to check: No visual or sound alerts for timers reaching zero.
Validate with people who use this workflow before building.
Hypothesis 4
Enable syncing with HealthKit or Google Fit to track timer usage alongside workouts.
Assumption to check: Lacks integration with fitness tracking apps.
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
The Standard Timer was specifically and specially designed for use in specialty gyms. With standard options for tabata and EMOM, you can easily adapt the timer to work for any workout. The main goal of The Standard Timer was to create a timer where the current time was the focal point of the app. The current time takes up the entire screen, especially great when projected or cast onto larger screens, so everyone in your gym can see it from wherever they are. FEATURES - 5 different modes : Tabata, EMOM, Interval, Stopwatch, Countdown - The ability to add a countdown/warm-up timer to your workout - Quick and easy time adjustment with manual typing and tap (+1, +5, reset) options - HUGE letters that take up the entire screen so everyone can see the time without effort - Remote mode : use this mode from your phone to control other connected devices - Bluetooth capability : Sync multiple devices, for example, control your Mac Mini display using your phone without ever having to touch a keyboard or mouse - Light/Dark Mode capability - Preround/Preworkout sound notifications
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 Native
Expo
React Navigation
Zustand
react-native-reanimated
react-native-picker
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.
