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
BlackList Call Pro: Spam Block
Spam calls, telemarketing, robocalls? Block them once — forever.
$3.99 · In-app purchases
PRICE
$3.99
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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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 BlackList Call Pro: Spam Block: map the core Finance 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 a more intuitive UI for adding and removing numbers.
Assumption to check: Users often find it hard to manage blocked numbers effectively.
Validate with people who use this workflow before building.
Hypothesis 2
Add detailed call history with call status and timestamps.
Assumption to check: Limited functionality for viewing call details.
Validate with people who use this workflow before building.
Hypothesis 3
Make the restore process more straightforward with clear prompts.
Assumption to check: Difficulty in restoring purchases.
Validate with people who use this workflow before building.
Hypothesis 4
Add a feature to notify users when a blocked call is attempted.
Assumption to check: No notifications for blocked calls.
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
Spam calls, telemarketing, robocalls? Block them once — forever. Black List Call stops unwanted numbers at system level: your iPhone simply never rings. WHAT YOU CAN DO • Block any number in two taps • Block whole prefixes (e.g. +1800…) — thousands of numbers at once • Enable official anti-telemarketing lists with one tap: Italy (AGCOM 0844/0843), France (ARCEP), Brazil (Anatel 0303), India (TRAI 140) • Flag suspicious numbers: they still ring, but marked " Spam?" • Check your stats: blocked numbers, covered numbers, days of protection WHY BLACK LIST CALL • True system-level blocking (iOS CallKit): blocked calls never ring and never interrupt you • 100% private: your black list never leaves your iPhone — no account, no servers • No ads • Works with every carrier • Set it up once and forget it EASY TO ACTIVATE The built-in tutorial guides you: one switch in Settings and the protection is on. Suitable for both professional and private use.
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
Supabase
react-navigation
@supabase/supabase-js
react-native-gesture-handler
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.
