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.
JetReader mainly does two things: helps you get books from your Calibre library onto your device, and gives you a highly customizable eReader for reading them.
$4.99
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.
Your first Build Kit is free with a verified email.
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 JetReader: map the core Books workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
JetReader mainly does two things: helps you get books from your Calibre library onto your device, and gives you a highly customizable eReader for reading them. Connect directly to a Calibre Content Server, use JetReader as a Calibre Wireless Device, or browse Calibre libraries stored in Dropbox, Google Drive, OneDrive or WebDAV services such as Nextcloud and ownCloud. Download books manually, or let JetReader keep your library up to date automatically in the background. Performance is a major focus, and JetReader has been tested with libraries containing 100,000 books. Your books can be browsed with flexible search and advanced filtering. Ratings and reading statuses can also be sent back to Calibre automatically. When you start reading, JetReader keeps your reading progress, bookmarks, annotations, dictionary lookups and statistics synchronized between your devices. You can highlight or underline text, add comments, copy selections, or send text to other apps. For unfamiliar words, use the built-in dictionary, open a compatible dictionary app, or ask for an AI explanation tailored to the context of the book you're reading. JetReader also tracks your reading habits and turns them into useful and fun statistics and visualizations on your device, which you can also share with friends if you want to. One of JetReader's main goals is to be as customizable as possible. You can choose what information is shown while reading, configure touch behaviour and shortcuts, and adjust colors, fonts and other reading settings to suit you. JetReader is designed with eReaders in mind. High-contrast themes, automatic image color adjustments and other eInk optimizations help make reading comfortable on eInk screens. See https://jetreader.net for more information, help and updates.
Written user reviews are not shown here. Check current App Store reviews >
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: Expensive subscription
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Missing features
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Poor performance
Validate with people who use this workflow before building.
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.
Not assessed in a Build Kit yet.
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.