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
One Line in Time
A quiet daily journal — one line a day, no streak, no nag.
$2.99
PRICE
$2.99
No 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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Combine features and design from your favorite apps.
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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 included
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 One Line in Time: 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
A quiet daily journal — one line a day, no streak, no nag. Open the app. Today's text field is one line. Write yesterday's weather, the cafe you went to, the thing your kid said, or one sentence that mattered. Tap done. Tomorrow, another line. Browse back chronologically through the feed, or tap a day on the calendar grid. Full-text search finds any line you've written. At year's end, export any date range as a paginated PDF styled like a paperback — a real keepsake from a quiet habit. New in v1.1: Light, Dark, and Follow-system appearance. Comfortable in any light. What you get - A single text field per day, on iPhone and iPad - Chronological feed and calendar grid for browsing back - Full-text search across every entry you've written - Paperback-styled PDF export, by date range - iCloud sync via your private container — entries live only on your devices - Light, Dark, or Follow-system appearance, picked in Settings The quiet posture - No streaks, no notifications, no analytics, no telemetry - No prompts, no AI suggestions, no mood tags, no auto-titles - No account, no login, no third-party SDKs, no ads - Paid once, kept forever. A line a day, a book in time. Made quietly by sthreelabs.
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
Incorporate reminder notifications and recurring task functionality.
Assumption to check: Lack of advanced features like reminders or recurring tasks.
Validate with people who use this workflow before building.
Hypothesis 2
Add charts/graphs to visualize task trends over time.
Assumption to check: Limited data visualization for task completion.
Validate with people who use this workflow before building.
Hypothesis 3
Implement offline storage and sync capabilities.
Assumption to check: No offline access or data syncing.
Validate with people who use this workflow before building.
Hypothesis 4
Enable task sharing and collaboration among users.
Assumption to check: No collaboration features.
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
@react-navigation/native
react-native-paper
moment
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
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.
