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
Serenis
Transform your life while you sleep with Serenis, the sleep learning hypnosis app designed to create lasting change from within.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
150 ratings · Top 15%
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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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included17 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 Serenis: map the core Lifestyle 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
Offer user-generated content or regular updates with new sessions.
Assumption to check: Limited session variety can lead to user fatigue
Validate with people who use this workflow before building.
Hypothesis 2
Enable session downloads for offline listening.
Assumption to check: No offline access for premium content
Validate with people who use this workflow before building.
Hypothesis 3
Introduce a freemium model with more free content to entice users.
Assumption to check: Subscription model may deter casual users
Validate with people who use this workflow before building.
Hypothesis 4
Implement a more guided onboarding process to help users navigate the app.
Assumption to check: Navigation can be confusing for new users
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
Transform your life while you sleep with Serenis, the sleep learning hypnosis app designed to create lasting change from within. The Sleep Learning System works with your subconscious mind during your natural sleep cycle. Through guided hypnosis and soothing background music, you'll deeply relax into REM sleep while powerful suggestions reshape your mindset and beliefs. Wake up feeling refreshed, energized, and ready to thrive in every area of your life. WHAT YOU'LL GET Serenis includes a FREE hypnosis program to get started, plus access to a comprehensive library of transformational content: Confidence Boost Personal Transformation The New You Stop Codependency The Power of Saying No Feel Attractive and Confident Win Them Over With Humor Clear Your Mind Meditation Soothing Sleep Music tracks Relaxing Sleep Sounds and Sleep Stories Each program is designed to work with your subconscious mind, creating deep and lasting change while you rest. CUSTOMIZE YOUR EXPERIENCE Edit your playlist to combine multiple programs Play sessions back-to-back for deeper transformation Set an alarm to wake you gently in the morning Browse the in-app store for additional programs Use Unlock All to access the entire library PROFESSIONAL GUIDANCE Created by Joel Thielke, Certified Clinical Hypnotherapist with over 20 years of experience helping people transform their lives through the power of hypnotherapy. Download Serenis free today and start your transformation tonight.
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
Supabase
zustand
react-navigation
expo-av
BUILD KIT DIFFICULTY
Intermediate
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.
