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
BarBlock: Barcode App Blocker
BarBlock reduces screen time by adding real-world friction to app blocking
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
10 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/
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 BarBlock: Barcode App Blocker: 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 support for more barcode types.
Assumption to check: Limited barcode formats supported
Validate with people who use this workflow before building.
Hypothesis 2
Improve scanning algorithm for accuracy.
Assumption to check: Occasional scanning errors
Validate with people who use this workflow before building.
Hypothesis 3
Add theme settings and layout customization.
Assumption to check: Lack of user customization options
Validate with people who use this workflow before building.
Hypothesis 4
Implement cloud sync for user data and preferences.
Assumption to check: No cloud sync feature
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
BarBlock reduces screen time by adding real-world friction to app blocking. Instead of relying on willpower or screentime limits, you lock selected apps by scanning a barcode you already have, such as one on a book, food package, etc. Those apps remain blocked until you scan the same barcode again, creating a deliberate pause before you can open distracting apps. That brief interruption helps break automatic habits and makes phone use a conscious choice. Setup is simple. Choose the apps you want to block, scan any barcode, and the apps stay locked until you rescan it. There are no extra devices to carry and nothing new to buy. BarBlock focuses on a minimal, privacy-first design. There are no subscriptions, no in-app purchases, no accounts, and no sign-ups. You can block an unlimited number of apps, the app works fully offline, and all data is stored locally on your device. Nothing is tracked, collected, or sent to external servers. This is designed for people who want to reduce screen time, users who bypass traditional app blockers, and anyone looking for a simple, reliable focus tool without tracking or complexity.
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
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@react-native-async-storage/async-storage
expo-camera
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.
