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.
This app was created out of a personal need to inventory and identify a wide variety of pens—most notably fountain pens
$9.99 · 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 PratherPens Fountain Pen iD: 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 pen database for identification
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: May lack detailed pen specifications
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: User interface could be cluttered
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No social features for sharing collections
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.
This app was created out of a personal need to inventory and identify a wide variety of pens—most notably fountain pens. What began as a simple organizational tool has grown into a broader vision: helping collectors worldwide keep track of their pen collections while also maintaining a rough estimate of each pen’s value. At the heart of the app is the Collection feature, which allows users to store photos, detailed descriptions, and historical notes about each pen. Alongside these records, the app provides an estimated value, giving collectors a practical way to monitor the worth of their collection over time. Whether you own a handful of cherished writing instruments or an extensive archive, the Collection feature is designed to make cataloging simple, visual, and informative. The app draws inspiration from the work of renowned pen collector and Parker 51 re-creator Ralph Prather, whose dedication to documenting and preserving pen history has influenced its design philosophy. His meticulous approach to his involvement in Fountain Pens serves as a guiding example for how this app seeks to empower collectors everywhere. As the app is still under active development, you can expect frequent updates and new features in the near future. Community feedback is central to its growth, so constructive suggestions and recommendations are always welcome. Every idea helps shape the app into a more valuable tool for pen enthusiasts across the globe. Please note that this app has NOT been tested on iPad or Apple Watch. Additionally, it HAS been tested on a variety of iPhones from 11 to 17, running iOS 18.x through 26.2. If you have any issues at all, please provide screenshots, video, and as much detail as possible to the support email and I'll be happy to troubleshoot with you. Your support on this project is very much appreciated! 10% of all proceeds go to the Disabled American Veterans organization (www.DAV.org) who provide assistance with benefits claims, transportation, and more.
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.