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.
MtnRnr is the training companion built for trail and road runners, ultra runners, and anyone who takes their running — and their privacy — seriously.
$0.99
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
Your first Build Kit is free with a verified email.
Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
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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.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
MtnRnr is the training companion built for trail and road runners, ultra runners, and anyone who takes their running — and their privacy — seriously. Run Free, Train Private. YOUR TRAINING. YOUR DEVICE. MtnRnr is built to keep your data where it belongs: on your device. No account required. No cloud profile. No data brokering. Your workouts, plans, shoes, and training history stay local unless you choose to export them. BUILT FOR TRAIL & ULTRA RUNNERS Whether you're targeting your first trail race or a 100-mile ultra, MtnRnr adapts to your goals, fitness level, and available schedule. Generate science-based training plans, review your running history, and get actionable pace guidance — all tailored to you. RACE COURSE IMPORT — PLAN FOR YOUR EXACT RACE Upload the GPX file of your goal race and MtnRnr will build your training plan and race-day pacing around that specific course. Real elevation profiles, real terrain, real distance — not a generic template. If you're toeing the line at a specific race, prepare for that race, not an approximation of it. HEALTH APP INTEGRATION MtnRnr reads authorized Apple Health data — workouts, routes, heart rate, VO2 max, sleep, steps, and activity metrics — to power training insights, fatigue estimates, and personalized recommendations. MtnRnr never writes data back to Apple Health and never shares your health data with third parties. RUNNING SCORE & PACES Unlock your Running Score from real race efforts and dial in science-based training paces across all effort levels — easy, tempo, threshold, and race pace. TRAINING PLANS Build customized plans around your goal race, available training days, and current fitness. Import your race's GPX course file and your plan will be shaped around that specific race — its distance, elevation, and terrain demands — so every training block has a purpose. PERFORMANCE INSIGHTS Monitor training load, fatigue, and fitness trends over time. Readiness-style guidance helps you understand how your body is responding — before it becomes a problem. RACE DAY TOOLS Prepare for your exact goal event with pacing utilities built around your imported race course. Review the real elevation profile, plan your effort segments, and walk to the start line knowing you trained for this specific race — not a generic one. SHOE TRACKING Add your running shoes, assign them to workouts, and monitor mileage so you always know when it's time to rotate or replace. STRENGTH LOGGING Log support sessions alongside your running for a complete record of your training week. FILE IMPORT Import GPX, FIT, and TCX workout files from Garmin, Suunto, COROS, and other devices through Apple Health or direct file import. PRIVACY BY DESIGN • No account or sign-in required • No advertising or third-party data sharing • No data written to Apple Health • Manual backup and restore — you control your exports • Health permissions managed through iOS Settings MtnRnr provides fitness and training guidance only. It is not a medical device and does not provide medical advice. Consult a qualified healthcare professional before beginning a new training program. Run Free, Train Private.
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
Not assessed in a Build Kit yet.
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.