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
MonoLine: Daily Journal
Most journaling apps fail because they ask too much
$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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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 MonoLine: Daily Journal: 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
Focus on a minimalistic design that emphasizes simplicity.
Assumption to check: Users find journaling apps overwhelming with too many features.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize themes and fonts.
Assumption to check: Lack of personalization options.
Validate with people who use this workflow before building.
Hypothesis 3
Implement an intuitive calendar view to easily access dates.
Assumption to check: Difficulty in finding past entries.
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
Most journaling apps fail because they ask too much. MonoLine asks for almost nothing. One photo. One line. Once a day. That's it. There's no blank page to stare at. No formatting toolbar. No folders or tags or organizational systems to maintain. You open the app, add a photo from your day, write a single line about it, and you're done. The whole thing takes thirty seconds. And then it compounds. After a week you have a week. After a month you have a month. After a year you have 365 moments — a grid of photos and the line you wrote beneath each one — that no highlight reel or social feed will ever give you back. WHAT MAKES MONOLINE DIFFERENT One entry per day, enforced. The constraint is the feature. You can't overwrite today or add a second entry. You show up, you write, you're done. Three ways to see your life. Feed view shows your entries chronologically. Grid view shows your photos as a visual archive. Both views let you tap any day to read what you wrote. Your streak, honestly tracked. A number in the corner of the app. No gamification, no pressure — just your record, kept honestly. Private by design. No ads. No AI reading your entries. No social features. Your journal is yours. Export anytime. Download your full journal as JSON or Markdown. Your words don't live only in an app. FOR PEOPLE WHO KEPT ABANDONING DAY ONE MonoLine is for the person who bought a beautiful notebook and filled three pages. For the person who downloaded four journaling apps and deleted them all. For the person who knows that one honest line beats a thousand words they never wrote. Start your first entry today.
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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
Supabase
React Navigation
date-fns
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.
