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
FontStar for Safari
• Ever frustrated by a website's font choice?
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
5 ratings · Top 5%
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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What's included15 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for FontStar for Safari: 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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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
Expand font library to include more options.
Assumption to check: Limited font selection compared to desktop applications
Validate with people who use this workflow before building.
Hypothesis 2
Add a feature to save frequently used fonts.
Assumption to check: No option to save favorite fonts
Validate with people who use this workflow before building.
Hypothesis 3
Provide clearer explanations and previews of premium fonts.
Assumption to check: In-app purchase for premium fonts can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Introduce advanced styling options like size and color.
Assumption to check: Lack of customization options for font styles
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
• Ever frustrated by a website's font choice? • Can't read important information quickly or clearly due to dysfunctional fonts? • You knew there must be a way to change the fonts but you scoured the internet only to find that almost all working solutions are made for Chrome/Firefox? But what about Safari? What about iPhone? What about iPad? You're not alone! >>>>>>>>>>>> Take back control of your reading experience with FontStar today! Our curated fonts are elegant, highly legible, and versatile—whether you're reading gossip articles or news reports, we've got you covered. Passionately designed for Safari users, FontStar works seamlessly across iPhone, iPad, and Mac (Apple Silicon). • Simple, no complicated geeky stuff. • Native iOS reader fonts first — renders beautifully & fast; works on any websites. • Safe — no ads, no tracking, no data collection. >>>>>>>>>>>> ~~~ • ~~~ • ~~~ Apple devices are packed with so many beautiful fonts like San Francisco. Why can't we just use them directly on the websites we browse?? Yes, from now on, we can! FontStar was thoughtfully designed to make the best of the beautiful, legible fonts pre-installed on iPhone and iPad, especially when it comes to reading mode. ~~~ • ~~~ • ~~~ I built this app because I use Safari every day and I'm tired of having to endure many website's poor readability and aesthetics online. After testing every other option on the App Store, I couldn't find one that I truly love. So I made my own. So far, I'm loving this one, and I hope you'll love it too!! -- JENSEN ^| • ~ • |^ * Note: 1. FontStar is only intended for the main Safari app. It will not work in in-app browsers (for example, when you open a link in Instagram, that's an in-app browser) or in browsers that are not Safari. 2. The app will be frequently updated to address reported issues and customer feedback. ** Privacy: FontStar requires access to the websites you visit to change the fonts. However, it does not collect, store, or transmit any of your personal data. Read our Privacy Policy for more details.
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Screenshots
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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.
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BUILD KIT DIFFICULTY
Intermediate
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.
