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.
Writers of all types deserve a dedicated timer
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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 WriteTimer: 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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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 functionality compared to comprehensive writing apps.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of user reviews indicating trust issues.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No cloud sync for data backup.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Basic design may not appeal to all users.
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.
Writers of all types deserve a dedicated timer. WriteTimer helps you build a daily writing habit with focused sprint sessions, word count tracking, achievement milestones, and beautiful progress rings — no accounts, no ads, and no data ever leaving your device. HOW IT WORKS Choose a session length or dial in a custom duration and press play. A full-screen countdown begins, with three animated progress rings showing your daily, weekly, and yearly writing time at a glance. Completed sessions are logged automatically. Need more time mid-sprint? Tap any preset to add minutes to a running timer without interrupting your flow. TRACK YOUR WRITING After each session, log a note about what you worked on, how many words you wrote, and even add a customizable tag. WriteTimer calculates your words-per-minute pace automatically and saves everything to your session history. Browse your history sorted by date, word count, or project tag. Tap any session entry to edit its note, word count, or tags from a single screen. The Stats tab shows daily, weekly, and yearly writing totals alongside a seven-day activity chart. BUILD YOUR HABIT WriteTimer tracks your writing streak day by day and awards achievements as you hit milestones — your first session, your first word count, consistent weeks, and more. A customizable daily reminder notification nudges you to open the app and write. FEATURES • No subscriptions - pay once for lifetime • Sprint timer with 7 presets and a custom duration option • Add minutes to any running session without stopping • Three animated progress rings — daily, weekly, and yearly goals • Automatic session logging for any session over one minute • Word count tracking with live words-per-minute calculation • Session notes to capture what you worked on • Project tags to organize sessions by book, blog, or project • Sortable session history — by date, word count, or tag • Writing streaks to build and maintain your habit • Achievements to mark your milestones • Five hand-crafted color themes you can customize • Fully customizable progress ring colors • Six completion sounds to mark the end of each sprint • Daily reminder notification at a time you choose • Stats view with a seven-day writing activity chart YOUR PRIVACY WriteTimer collects no data whatsoever. There are no accounts to create, no analytics running in the background, and no third-party SDKs of any kind. Everything — your sessions, word counts, notes, tags, and streaks — lives entirely on your device. BUILT FOR WRITERS Whether you're working on a novel, a blog post, a screenplay, or a daily journal practice, WriteTimer gives you the motivation and structure to sit down, focus, and write. Every session is logged. Every word is counted. Every streak is worth protecting.
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.