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
Plain Water
Plain Water is a water tracker that respects your time and intelligence
$2.99 · In-app purchases
PRICE
$2.99
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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Combine features and design from your favorite apps.
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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 included15 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 Plain Water: 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
Incorporate customizable reminders with haptic feedback.
Assumption to check: Many water tracking apps lack engaging reminders.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a simple one-tap logging feature.
Assumption to check: Users often forget to log their water intake.
Validate with people who use this workflow before building.
Hypothesis 3
Add social challenges and sharing options.
Assumption to check: Limited social features for motivation.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance graphs and statistics for better insights.
Assumption to check: Poor visualization of hydration data.
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
Plain Water is a water tracker that respects your time and intelligence. No mascots, no gamification, no llamas. FAST & MINIMAL • Log water in under 0.5 seconds • Zero animations - instant updates • Clean, distraction-free interface • No account required • All data stored locally on your device ACCESSIBILITY FIRST • Full VoiceOver support - navigate with eyes closed • Voice Control integration for hands-free use • Dynamic Type support (XS to XXXL text sizes) • Switch Control compatible • Configurable haptic feedback (4 intensity levels) • Color blind-safe design with patterns • Perfect for one-handed use • High contrast mode support POWERFUL FEATURES • Home screen widgets (small & medium) • Siri Shortcuts integration - log water with your voice • Action Button support (iPhone 15 Pro and newer) • Apple Health integration - automatic water logging • Smart reminders based on your sleep schedule • Detailed history tracking with charts • Customizable daily goals (1000ml - 5000ml) • Multiple unit support (milliliters & ounces) PRIVACY FOCUSED • All data stored locally on your device • No account creation required • No tracking or analytics • No ads, ever • No data collection • No third-party SDKs DESIGNED FOR EVERYONE Whether you're blind, have motor disabilities, or just want a fast app - Plain Water works for you. Accessibility features benefit everyone through speed and simplicity. Perfect for: • People who value their time • Accessibility users (VoiceOver, Voice Control, Switch Control) • Anyone tired of gamified health apps • Users seeking privacy-first apps • Minimalism enthusiasts No llamas. Just hydration.
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
Zustand
Supabase
React Navigation
BUILD KIT DIFFICULTY
Starter
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.
