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.
Open Ink is a quiet AI-powered journal for the small, daily practice of writing your thoughts down
$4.99 · 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.
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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.
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 Open Ink: map the core Health & Fitness 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: Users often find it difficult to integrate multiple fitness tracking features into one app.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of real-time feedback during workouts.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Inadequate nutrition tracking options.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Limited progress tracking visuals.
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.
Open Ink is a quiet AI-powered journal for the small, daily practice of writing your thoughts down. Every morning, you open the app to one short question — a fresh prompt written by an AI editor whose only job is to invite you to notice something. Some days it lands on a small joy. Other days, on the thing you've been carrying. You write a sentence or a page, in your own words, with mood and tags if you want them. — A SHORT, CALM PRACTICE — • One new reflection prompt every day, never the same twice • A clean writing space with mood and tags • Voice-to-text on demand — speak when words come easier spoken • Templates if you want a place to start (gratitude, morning pages, goal reflection, more) • Auto-save, so nothing is lost • Yesterday-anchored streaks (you have the full current day to write before today's streak counts as broken) • Search any entry by mood, tag, or word • A calendar view of every day you've written — WHAT OPEN INK NOTICES — • "On this day" — entries from a month, six months, or a year ago surface gently on the home screen • Weekly threads — every Sunday, Open Ink reads back through your week and surfaces the themes that ran through it • Next-step nudges — small invitations to add another layer to your personality model so prompts land more sharply — PERSONALIZED TO YOUR VOICE — Daily prompts are reworded to fit you. A short Big Five baseline at sign-up tunes the tone. Optional Enneagram and Attachment lenses (Pro) deepen the personalization further. If you add a few birth details (optional, anytime), reflections quietly weave in personality patterns drawn from your birth chart — same question, phrased so it lands for you. We never name a sign or use astrology jargon in the prompts. The personalization is quiet and opt-in. — BRING YOUR EXISTING WRITING IN — If you already journal somewhere else, paste from Apple Notes or pick a .txt / .md file — Open Ink parses it into entries and dates them. Export your full archive as Markdown any time, also from inside the app. — A NOTE ON PRICING — Open Ink is free to install. A small Pro subscription unlocks unlimited AI insights on entries, deeper personality lenses, templates, unlimited 30-day reflections, and richer cross-entry memory. Manage or cancel from your iPhone Settings → Subscriptions any time. — PRIVACY — Your entries are encrypted in transit and at rest, tied to your account. Delete your account from inside the app and every entry goes with it. We never sell your data, never share it with third parties, and never train models on it. Open Ink is built by an independent developer. If something feels off — write us at [email protected] and you'll hear back from a human.
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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.