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
lumen.
lumen
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
24 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.
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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 included18 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 lumen.: map the core Games 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
Introduce new game modes or challenges regularly.
Assumption to check: Limited gameplay variety can lead to boredom.
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the purchasing process and provide clear value for items.
Assumption to check: In-app purchases can be confusing for users.
Validate with people who use this workflow before building.
Hypothesis 3
Implement social sharing and invite friends features.
Assumption to check: Lack of social features to engage users.
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to download levels for offline play.
Assumption to check: No offline play option.
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
lumen. is a puzzle game with unique mechanics where you solve levels using light, lenses, and mirrors. You’ll find yourself in an old attic, discovering the mysterious antique box of Ms. Olivia McLumen — a great inventor who lived in Scotland over a hundred years ago. She preserved her inventions in cinematic frames for you to restore. HUNDREDS OF WELL-DESIGNED FAMILY-FRIENDLY LEVELS Use lights, lenses, and mirrors to solve a variety of levels, from easy to challenging. lumen. is family-friendly and suitable for players of all ages. EASY TO LEARN, HARD TO MASTER The game is easy to pick up and play at any time, whether for short or long sessions, on any Apple device with cross-device save functionality. BEAUTIFUL GRAPHICS, MUSIC & SOUND EFFECTS Dive into a fascinating atmosphere of soothing piano and saxophone melodies within a handcrafted 1800s box, and enjoy all the small details carved within. Enjoy our game! Lykke Studios Team
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
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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.
