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
LiftIron
LiftIron is your private training journal for the gym and the road, lifting and cardio in one place, on iPhone, Apple Watch, and Mac.
$14.99 · In-app purchases
PRICE
$14.99
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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
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Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 LiftIron: 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
Implement reminders or prompts to encourage logging workouts.
Assumption to check: Users may struggle to track workouts consistently.
Validate with people who use this workflow before building.
Hypothesis 2
Add social sharing and challenges to engage users.
Assumption to check: Lack of social features for motivation.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance navigation clarity with guided onboarding.
Assumption to check: Difficult to navigate without clear pathways.
Validate with people who use this workflow before building.
Hypothesis 4
Expand food database and include barcode scanning for easy logging.
Assumption to check: Limited nutrition tracking options.
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
LiftIron is your private training journal for the gym and the road, lifting and cardio in one place, on iPhone, Apple Watch, and Mac. Most workout apps make you choose: log sets OR track runs. LiftIron does both. Build routines, crush your lifts, then log a GPS walk, run, or ride, or spin and treadmill sessions indoors without switching apps. STRENGTH TRAINING • Start from saved routines or build a custom workout on the fly • Searchable exercise library with muscle and equipment filters • Log weight, reps, and rest between sets with a built-in rest timer • Favorite routines for one-tap access from Today • Per-exercise prescriptions (sets × reps) on your routines CARDIO, INDOOR & OUTDOOR • GPS tracking for walking, running, and cycling outdoors • Manual logging for spin, treadmill, and indoor sessions • Distance in miles or kilometers; review and save when you stop APPLE WATCH • Start workouts and log sets from your wrist • Digital Crown-friendly set entry • GPS track and quick-log cardio from Watch SIRI & SHORTCUTS • “Log cardio” and “Start GPS tracking” with App Intents • Hands-free logging when your phone is across the gym GOALS & ACTIVITIES • Weight goal tracking with progress charts • Daily burn estimates from your profile (BMR-based) • Unified Activities timeline for lifts and cardio SYNC & PRIVACY • iCloud sync across iPhone, Watch, and Mac • No account sign-up, your data stays in your private iCloud • Export your history (CSV/JSON) • No ads. No tracking. No social feed. LiftIron is built for people who lift and move, not another generic rep counter. Questions or feedback? Contact [[email protected]]
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
Supabase
React Navigation
Zustand
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.
