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
MemoVault: Time-Locked Memos
MemoVault is a private time-capsule app that lets you write messages, save memories, and schedule them to unlock in the future — days, months, or years from now
$1.99 · In-app purchases
PRICE
$1.99
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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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/
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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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for MemoVault: Time-Locked Memos: 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
Implement reminders or notifications to alert users.
Assumption to check: Users may find it difficult to remember unlock times.
Validate with people who use this workflow before building.
Hypothesis 2
Add categorization or tagging features for easier retrieval.
Assumption to check: Limited features for organizing memos.
Validate with people who use this workflow before building.
Hypothesis 3
Implement sharing functionality via email or social media.
Assumption to check: No way to share memos with others.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce subscription tiers for additional features.
Assumption to check: Single purchase model may not cater to all 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
MemoVault is a private time-capsule app that lets you write messages, save memories, and schedule them to unlock in the future — days, months, or years from now. Capture who you are today and experience it again when the moment is right. Whether it’s goals, reflections, encouragement, or milestones, MemoVault turns everyday thoughts into meaningful future moments. Key Features • Time-Locked Messages — Write notes and memories that unlock on a chosen future date • Future Self Journaling — Reflect on your life, mindset, and progress over time • Flexible Scheduling — Set exact dates or choose random surprise delivery • Smart Notifications — Get notified the moment a memo is ready to be revealed • Photo Memories — Attach an image to preserve moments exactly as they were • Reflection & Re-Locking — Revisit past memos, reflect, and lock them again for future rediscovery • iCloud Sync — Securely access your memos across all your Apple devices, even after upgrading phones Why MemoVault MemoVault isn’t a notes app. It’s a personal archive of who you were — and who you’re becoming. Use it to: • Set goals and check in on them later • Preserve memories you don’t want to forget • Send encouragement to your future self • Create meaningful surprises for tomorrow Your memos stay private and are synced securely through iCloud. Build a habit of reflection. Create moments for your future self. Download MemoVault and start your personal time capsule today. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://sites.google.com/view/memovaultprivacypolicy/home Extended Terms of Use: https://sites.google.com/view/memovaultterms/home
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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
@react-navigation/native
React Native Paper
Firebase
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.
