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.
** 2022 APP STORE AWARD Winner **
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 Water tracker Waterllama: 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: Users find it challenging to set personalized hydration goals.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited drink type options available for logging.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Some users experience difficulty in tracking water intake over long periods.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Occasional bugs in logging entries.
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.
** 2022 APP STORE AWARD Winner ** ** 2022 APPLE DESIGN AWARD Finalist ** You know you need to drink more water! • Smart Reminders during your day • Complete 10+ fun healthy Challenges • 50+ Hydration Tips • Collect & fill up 140 cute Characters • Track water from anything you drink: 150+ most popular beverages • Apple Watch app • Widgets: home screen, lock screen, control center • Track Calories • Calculate your daily water goal based on your weight, activity & weather • Charts & monthly Recaps • Streaks • Celebrate your day with fun recap illustration • Create your own beverages • 20+ Animated Messages Stickers • Logs Calendar • Monthly In-App Events • Apple Health Sync • Shortcuts & Siri support • Oz/Ml measure units • Localized into 22 languages • All features are based on scientific studies of building healthy habits Benefits of drinking water + Weight loss & healthy skin + Improves productivity & mood + Relieves fatigue & boosts energy + Healthier heart, immune system & brain + Regulates blood pressure & body temperature Waterllama water tracker free app is simple & fun. Get reminder to drink water regularly. Join healthy challenges like Weight Loss Sloth which will motivate you to drink water only, help with intermittent fasting as your water fasting app. Don't worry about being too busy, use drink water reminder free & don't just hydrate when you feel thirsty. Avoid dehydration by using my water app drinking reminders & never forget to drink water again. Apple Watch water drinking reminder included. Waterllama water minder calculates how much do you need to drink water according to your activity level, body weight, climate & gender (male, female, pregnant or breastfeeding mom). Hydration is essential for human body. Waterllama reminds you to hydrate properly & maintain the balance of your body fluids by drinking water. Waterllama mywater tracker can help you have a better focus & concentration. Drink water to exercise more effectively. Water tracker can help you avoid fatigue, mood swings & low motivation. Managing your water intake can help with a weight loss since you will feel more full & avoid overeating. Daily hydration helps you restore energy & contribute to feeling happier. Water tracker can even help you boost productivity & reduce stress when used the right way. Building a new healthy habit can be much easier when all of your drinks are logged. You can see all of your water log in the Waterllama water intake calendar. Waterllama free water drinking app features: track water intake, smart reminders, water reminder apple watch app, streaks, water intake goal calculator, custom daily water goal, llama character, water intake calendar, lock screen widgets, water cup size, Oz/Ml units, Apple Health sync and more. Waterllama drink water app premium paid features: 100+ characters, 10+ challenges, 150+ beverages, 10+ reminder sounds, create custom beverages, personalized beverages panel, edit water intake history, change glass/cup size. Plus you'll be able to access even more Beverages, Characters, Challenges & features in future monthly updates. Waterllama premium features are available as a monthly & annual subscription or as a one-time purchase. Your iTunes account will be charged at confirmation of purchase. The subscription will automatically renew unless auto-renew is turned off at least 24 hours before the end of the billing period. You can go to your iTunes Account Settings to manage your subscription & turn off auto-renew. To restore all your previous purchases use the "Restore Purchases" button located at the bottom of the Premium Features popup. Stay hydrated & happy using Waterllama drink water reminder n tracker Terms of use & Privacy policy https://waterllama.com/privacy-policy-terms-of-use.pdf Note: HealthKit integration is to sync Water, Caffeine, Dietary Energy data with Apple Health app
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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.