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
LockDay: To-Do List & Planner
Your whole day, right on your Lock Screen.
Free
PRICE
Free
No in-app purchases
BUSINESS MODEL
Free
No overall Grossing estimate available
RATING
★ 5.0
10 ratings · Top 5%
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.
Build your own version
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 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 LockDay: To-Do List & Planner: map the core Productivity workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Your whole day, right on your Lock Screen. LockDay turns your to-dos, calendar and notes into a Lock Screen that updates itself. Pick up your phone and you already know what's next. — PRIORITIES FIRST Sort tasks by importance and urgency in a simple four-box matrix. The tasks that matter stay in view. — CALENDAR + TASKS See events from your iPhone calendars next to your tasks: week strip, month view and today's timeline. — A LOCK SCREEN THAT UPDATES ITSELF Pick a template, choose what to show and add your own photo. A quick one-time Shortcuts setup keeps it fresh. — NOTES & WIDGETS Pin a note or checklist to your Lock Screen. Widgets for your Home Screen and Lock Screen. — PRIVATE BY DESIGN No account, no ads, no tracking. Your data stays on your device or in your own iCloud. LockDay Pro unlocks every template and style, unlimited tasks and notes, repeating tasks and iCloud sync. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in your Apple Account settings. Terms of Use: https://lockday.xyz/terms/ Privacy Policy: https://lockday.xyz/privacy/
Written user reviews are not shown here. Check current App Store reviews >
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 smart sorting and filtering options.
Assumption to check: Users often feel overwhelmed by long task lists.
Validate with people who use this workflow before building.
Hypothesis 2
Add customizable reminders and notifications.
Assumption to check: Lack of reminders for due tasks.
Validate with people who use this workflow before building.
Hypothesis 3
Incorporate a visual project management board.
Assumption to check: Difficulty in managing projects with many tasks.
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to personalize task colors and tags.
Assumption to check: Limited customization options for task appearance.
Validate with people who use this workflow before building.
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-native-calendar-picker
@supabase/supabase-js
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.
