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.
Achieve your goals faster than ever.
Free
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.
Rork plan preview for SmartGym: Gym & Home Workouts: 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 variety of workouts compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of social features for user engagement
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Inconsistent tracking of nutrition and workouts
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No integration with wearables
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.
Achieve your goals faster than ever. • Apple's Apple Watch App of the Year • Apple Design Awards Finalist • #1 Health & Fitness app in over 30 countries FORBES: "Best Apple Watch Apps for Health and Fitness" Looking for an app to help you work out? SmartGym offers a beautiful, elegant and easy way. With an amazing and advanced algorithm that creates personalized training plans to help you achieve all your goals faster! It's like having a Personal Trainer and a Motivator in your pocket or wrist. No matter which equipment you have available, SmartGym will always give you the best workout possible, personalized just for you and what you have. Whether you want to lose weight, build muscle, improve your endurance, or just have fun, SmartGym has you covered. If you're a beginner, SmartGym will help, guide and give you all the confidence you need to start working out. If you're already experienced, SmartGym will give you all the right tools in order to better manage your workouts and track your progress. ● Smart Trainer: Artificial Intelligence able to create personalized workouts that can be done at home or at the gym, based on the equipment you have, the muscles you want to target, and for how long and how often you want to work out. All tailored to your experience level (beginner, intermediate or advanced). ● SmartGym tracks your progress and gives you feedback and tips along the way, like adjusting the number of sets, reps, weight, replacing exercises or even suggesting an entire new routine. ● Track your muscles fatigue after each workout and throughout your entire fitness journey. ● Don't want to use our Artificial Intelligence to create your workouts? That's fine! You can also access over 130 pre-made workouts, carefully created by professionals and curated for you. ● Every workout always adjusted to the equipment you have available. ● Choose from over 700 pre-installed exercises with images and animations, ranging from bodyweight to dumbbells, kettlebells, resistance bands, and more. And if you don't find the one you're looking for, you can always add your own custom exercises with your own images. More Features: • Full HIIT Support with Voice Guidance. • Full Home Workouts support. • Add as many exercises to your routines as you want. • Create custom timer for each specific exercise. • Share your routines with your friends. • Integration with Apple's Health and Fitness apps. • Beautiful charts showing all your progress. • Powerful iPad app. • SharePlay. Work out together with your friends and family using FaceTime. Apple Watch only: • SmartGym is one of the most advanced Apple Watch app in the world. • Standalone Watch app. No need to use the iPhone with you. • Smart Trainer (no iPhone required). With just a few taps, you can get an entire workout created for you, right from your wrist! • Keep track of your heart rate, distance and calories burned. • Workouts count towards your activity rings. • Use Siri to start your workout. • Modify your exercise right from the Watch. Personal Trainer Only: • Use Augmented Reality to analyze your students' posture. (A12 device or later is required for this feature) • Siri Shortcuts with Parameters. Quickly get your student's routines with just your voice. • Great way to manage all your students. Subscriptions Details: The free version of SmartGym gives access to 2 routines, 3 workouts and 2 measures. Upgrade to our monthly or annually subscriptions to access all our features. Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. Account will be charged for renewal within 24-hour prior to the end of the current period, and identify the cost of the renewal. Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication. Terms of Service: http://smartgymapp.com/terms/ Privacy Policy: http://smartgymapp.com/privacy/
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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.