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
Archies Gym
Meet your new workout partner — Archie the Schnauzer.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
3 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 Archies Gym: 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
Offer extensive exercise library and user-defined routines.
Assumption to check: Limited exercise variety and customization options.
Validate with people who use this workflow before building.
Hypothesis 2
Integrate social challenges and leaderboards.
Assumption to check: No social or community features.
Validate with people who use this workflow before building.
Hypothesis 3
Include HealthKit and Google Fit integration.
Assumption to check: Lack of integration with wearable devices.
Validate with people who use this workflow before building.
Hypothesis 4
Implement better logging features and reminders.
Assumption to check: Inconsistent logging of workouts and meals.
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
Meet your new workout partner — Archie the Schnauzer. Archie's Gym is a clean, no-nonsense fitness tracker built for people who want to move more and track less. Log workouts, monitor your daily activity, and hit your weekly goals — all with a little encouragement from Archie along the way. TRACK YOUR ACTIVITY Connect Apple Health to automatically track steps, calories, distance and heart rate. Apple Watch users get precise move, exercise and stand tracking throughout the day. LOG YOUR WORKOUTS Choose from 16 workout types including Running, Strength, HIIT, Cycling, Yoga, Dancing and more. Log duration and let Archie calculate your calories burned. HIT YOUR GOALS Set weekly workout targets, daily exercise minutes, calorie goals and step goals. Watch your progress bars fill up as the week goes on. BUILD YOUR STREAK Every day you work out keeps your streak alive. Archie is watching — don't break the chain. DAILY REMINDERS Set a daily reminder and Archie will nudge you on days you haven't logged a workout yet. No spam — one reminder per day maximum. PRIVACY FIRST No accounts. No subscriptions. No data collection. Everything stays on your device. Sit. Stay. Lift. — Archie
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
Zustand
Axios
Victory Native
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.
