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
DotInk: EInk Assistant
designed for e-ink enthusiasts, making your portable readers more powerful and easier to use.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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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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.
What's included16 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for DotInk: EInk Assistant: map the core Utilities 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
Implement more robust features such as tagging, search, and better organization.
Assumption to check: Limited features and poor user experience.
Validate with people who use this workflow before building.
Hypothesis 2
Focus on a clean, user-friendly design and intuitive navigation.
Assumption to check: Low ratings indicate dissatisfaction with the app interface.
Validate with people who use this workflow before building.
Hypothesis 3
Integrate cloud syncing for easy access across devices.
Assumption to check: No syncing capabilities between devices.
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to customize note appearance and organization.
Assumption to check: Lack of customization options for notes.
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
designed for e-ink enthusiasts, making your portable readers more powerful and easier to use. seamlessly convert .ttf fonts and e-books on your phone into .bin fonts, xtc, or epub formats perfectly tuned for portable e-ink screens. [core features] • wysiwyg font customization import external .ttf fonts or use system fonts. adjust line spacing, tracking, size, weight, and more with precision. real-time simulation of various e-ink screens—preview exactly how it looks before exporting. • powerful e-book toolbox import various e-book formats to preview layouts directly on your phone. customize formatting and convert to standard formats with a single tap. • seamless device integration wireless connection to supported devices for font pushing and file management. supported devices: xteink x4, edcbook, murphy 3.7, wudada·little ink, and more. • privacy first & offline 100% offline: all processing is done locally on your device. no user data is ever uploaded. (note: network and location permissions are required solely for connecting to your e-ink hardware.) [note from developer] this app is an indie project built with "ai vibe coding." while i strive for perfection, i cannot test every scenario. if you encounter any bugs, i appreciate your understanding. thank you to all the "community supporters" for your feedback! feel free to leave suggestions or comments.
Written user reviews are not shown here. Check current App Store reviews >
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.
SUGGESTED BUILD STACK
React Native
Expo
Zustand
React Navigation
@react-native-async-storage/async-storage
react-native-paper
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.
