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
Repline: Workout Tracker
Repline is a focused strength-training log for lifters who want to spend less time fiddling with an app and more time under the bar.
$0.99
PRICE
$0.99
No 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Repline: Workout Tracker: 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 a quick log feature with a floating action button.
Assumption to check: Users often find it hard to log workouts quickly.
Validate with people who use this workflow before building.
Hypothesis 2
Add social challenges and sharing options.
Assumption to check: Lack of social features to share progress.
Validate with people who use this workflow before building.
Hypothesis 3
Include different types of charts and graphs for data visualization.
Assumption to check: Limited visual progress tracking options.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce goal setting and reminders for users.
Assumption to check: Difficulties in setting and updating fitness goals.
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
Repline is a focused strength-training log for lifters who want to spend less time fiddling with an app and more time under the bar. Build your routines, log sets, reps, and weight as you go, and let your iPhone and Apple Watch stay perfectly in sync for the entire workout — start a set on your wrist, see it on your phone, and vice versa. BUILT FOR THE GYM • Routines and templates — set up your workout once, reuse it forever • Fast set logging — weight, reps, and completion in a tap • Per-set rest timers with alerts that reach you even when the app is in your pocket or your wrist is down • Warm-up sets that stay out of your working-set stats • Supersets for back-to-back movements • Per-exercise notes and sticky notes APPLE WATCH, DONE RIGHT • A real Apple Watch app — log your whole workout from your wrist • Live sync with your iPhone throughout the session • Rest countdown and buzz right on your wrist • Pick up on either device without missing a beat SEE YOUR PROGRESS • Automatic personal-record tracking — weight, reps, and volume PRs • A dedicated exercises library with your history and records per movement • Full workout history PRIVATE BY DESIGN • Your data lives on your device — no account, no cloud, no tracking • Optional Apple Health integration writes your completed workouts to Health, and nothing else Repline is iPhone + Apple Watch, built for people who take training seriously and want a log that keeps up.
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-native-chart-kit
react-native-gesture-handler
@supabase/supabase-js
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.
