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
STEEL MIND
Steel is your personal discipline training ground
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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 STEEL MIND: map the core Health & Fitness 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 exercise library and add user-generated content.
Assumption to check: Limited exercise variety may not engage users long-term.
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate interactive charts and gamification.
Assumption to check: Tracking progress can feel tedious without engaging visuals.
Validate with people who use this workflow before building.
Hypothesis 3
Offer clearer value propositions and free trials.
Assumption to check: Subscription model can deter users if not clearly communicated.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce community challenges and social sharing features.
Assumption to check: Lack of social features may reduce user motivation.
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
Steel is your personal discipline training ground. Every day is a battle between you and your mind — and Steel helps you win. THE BATTLE SYSTEM Log each temptation as a WIN or a LOSS. Steel tracks your daily win rate, streaks, and history so you can see exactly how you're performing in the fight against your habits. Celebrate victories with satisfying feedback, and face losses honestly to fuel your growth. MEDITATION SITS Build an unshakable mind through daily meditation. Steel includes a built-in meditation timer with AI voice guidance, customizable sit durations, and scheduling so you never miss a session. Plan your sits, complete them, and watch your consistency grow. DAILY DASHBOARD See your battle stats, sit progress, and win rate at a glance. Know exactly where you stand every single day. END-OF-DAY SUMMARY Review your daily performance with a clear breakdown of wins, losses, and completed sits. Hold yourself accountable. BATTLE HISTORY Look back on your journey. Every battle and every sit is logged, so you can track patterns and measure long-term progress. FEATURES - Log wins and losses against bad habits and temptations - Built-in meditation timer with AI voice guidance - Daily dashboard with real-time stats - End-of-day performance summary - Full battle and meditation history - Customizable habits and tags - Personalized onboarding - Dark, focused interface designed for discipline - Face ID / biometric sign-in Steel is not a gentle wellness app. It's a tool for people serious about building real discipline and defeating their weaknesses, one battle at a time.
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.
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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.
