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
Satan8Ball
Enter a darker ritual experience with Satan8Ball.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.0
4 ratings · Below Average
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.
Build your own version
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 Satan8Ball: map the core Entertainment 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
Incorporate social sharing and user-generated questions.
Assumption to check: Limited user engagement due to lack of features.
Validate with people who use this workflow before building.
Hypothesis 2
Focus on a polished, bug-free interface.
Assumption to check: Poor rating due to UI bugs.
Validate with people who use this workflow before building.
Hypothesis 3
Add a tutorial or help section for new users.
Assumption to check: Minimal instructions lead to confusion.
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to personalize their experience with themes or question categories.
Assumption to check: Lack of customization options.
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
Enter a darker ritual experience with Satan8Ball. Ask your question, summon the answer, and listen as the Satan8Ball responds in its own eerie voice. Designed for a more atmospheric and theatrical experience, Satan8Ball transforms the classic fortune concept into something far more sinister. The app now includes two dark experiences in one: ASK Use shake, rotation, or hold-to-summon interaction to awaken the ritual and hear one of more than 80 creepy prerecorded responses. With fog, embers, lightning, and infernal atmosphere, the Ask screen feels more alive than ever. LORE Go beyond the answers and explore a growing archive of dark occult content. Read through entries covering: • occult symbols • infernal figures • folklore and dark myth • ritual concepts • strange historical beliefs Discover entries inspired by Baphomet, pentagrams, summoning circles, grimoires, infernal figures, hellhounds, witching hour lore, and more. Features • Over 80 eerie voice responses • Multiple ways to summon an answer • Dark ritual-inspired visual effects • Expanding Lore archive with themed artwork • Occult symbols, infernal figures, folklore, and strange history • Designed for fans of horror, dark mythology, and supernatural entertainment Satan8Ball is a dark entertainment experience built for those who enjoy creepy atmosphere, occult themes, and sinister fortune-style fun.
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
React Navigation
React Native Reanimated
Expo 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.
