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.
A line a day
$1.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for A Line a Day: 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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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
Assumption to check: Limited customization options for entries
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No reminders for daily entries
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of export options
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
A line a day. That's all it asks. No blank-page pressure, no streak guilt, no monthly fee. Just open the app, write one sentence about today, and close it. Ten seconds, done. The quiet magic happens later. Come back on the same date next year — and the year after — and you'll see what you wrote on this day in every year before, stacked together on one screen. Watching your life rhyme across time is the kind of thing you can't feel until you've kept it a while. This app is built to give you that. WHY YOU'LL KEEP IT • One line, that's it. The smallest possible habit, so you actually stick with it. • On this day. Revisit the same date across all your past years at a glance. • Truly private. Everything stays on your device. No account, no sign-up, no cloud. • Yours forever. Pay once. No subscription, ever. • Calm by design. A clean, distraction-free page made for reflection, not scrolling. WHO IT'S FOR If you've started a dozen journaling apps and abandoned every one, this is the antidote. One line is small enough to keep up, and the years quietly add up into something you'll treasure. Perfect for a gratitude practice, a mood log, a memory keeper, or simply a daily note to your future self. No ads. No tracking. No noise. Just you, one line, and the years.
Written user reviews are not shown here. Check current App Store reviews >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.