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.
Built for lifters who take their training seriously.
Free · In-app purchases
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.
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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.
Rork plan preview for Stronger - Gym Workout Planner: 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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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
Assumption to check: Limited exercise library for custom workouts
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No social features for motivation
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Subscription model may deter users
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Interface may feel cluttered
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Built for lifters who take their training seriously. Trusted by over 1 million athletes worldwide, Stronger is the simple and intuitive workout planner to help you crush your fitness goals. Track your workouts, receive AI coaching, and compete with your friends. Whether you want to build strength, lose weight, or simply stay consistent, Stronger is your perfect gym companion. WHY STRONGER? Join a global community of athletes logging their workouts, smashing fitness goals, and supporting each other. EVERYTHING YOU NEED TO TRAIN SMARTER - Workout Planner: Access hundreds of exercises tailored for every muscle group, with AI recommendations to optimise your training - Advanced Tracker: Easily log sets, reps, and weights, and track progress with powerful analytics - Warm-Up and Drop Sets: Record how much effort you're putting into every rep - Custom Workout Routines: Save your favourite exercises in personalised routines for structured, efficient training - Lifting Groups: Join or create groups to stay motivated and compete in challenges - Strength Score: Benchmark your strength and build a balanced physique - Customised Routines: Generate plans tailored to your goals - Warm-Up Tracking: Prep effectively and track warm-ups separately - Visual Guidance: Learn new lifts with detailed instructional GIFs FOR EVERY FITNESS JOURNEY Beginner or pro, Stronger supports you every step of the way: - Focus on specific muscle groups like shoulders, chest, or legs - Plan routines for strength, hypertrophy, or fat loss - Track total volume, rep max, and lifting history READ WHAT USERS SAY - "I'm a personal trainer and use Stronger every day—best app out there" - "Best workout tracker. I've been using Stronger for three months now. I've tried Jefit, Strong, and Hevy, and Stronger is the clear winner." - "This app is a game changer for my workouts. Five stars!" - "One of the best apps I've ever bought." GET STARTED TODAY Download now and start your free 7-day trial. Join a thriving community of lifters redefining strength training. Together, let's lift Stronger! STRONGER PRO Stronger PRO is available via auto-renewing monthly or annual subscription. Start with a free 7-day trial to explore all features. A subscription is required for full access after the trial period. If you choose not to subscribe, you'll retain free access to the Workout Planner and Visual Guidance. Payment will be charged to your Apple ID account at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscriptions by going to your Account Settings after purchase. TERMS & SUPPORT Have a question or suggestion? Reach out at [[email protected]](mailto:[email protected]). Privacy Policy: https://www.strongermobileapp.com/privacy-policy Terms of Service: https://www.strongermobileapp.com/terms-of-use
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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.
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.