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
75 Days Challenge Tough & Soft
BeHard is the app for the 75 Days Challenge, a self-improvement and fitness program that requires participants to complete specific tasks for 75 consecutive days
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
8,518 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 included17 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 75 Days Challenge Tough & Soft: 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
Incorporate social challenges and rewards to enhance engagement.
Assumption to check: Users find it difficult to stay motivated for 75 days.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to create and customize their own challenges.
Assumption to check: Limited customization of challenges.
Validate with people who use this workflow before building.
Hypothesis 3
Implement more detailed tracking and reporting features.
Assumption to check: Difficulty in tracking progress over time.
Validate with people who use this workflow before building.
Hypothesis 4
Design a cleaner layout with better organization of information.
Assumption to check: User interface can feel cluttered.
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
BeHard is the app for the 75 Days Challenge, a self-improvement and fitness program that requires participants to complete specific tasks for 75 consecutive days. The app helps you stay on track with your challenge by tracking your progress, providing motivation, and connecting you with other participants. BeHard is free to download. Some features—such as reminders, insights, unlimited AI coach, and other premium tools—require a paid BeHard Pro subscription. BeHard Pro subscription plan: * Monthly: $12.99 * Annual: $39.99 Payments and Renewal: * Payment will be charged to iTunes Account at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. * Account will be charged for renewal within 24-hours prior to the end of the current period. * You can manage or turn off auto-renew in your Account settings at any time after purchase * No cancellation of the current subscription is allowed during the active period. Privacy Policy - https://firebasestorage.googleapis.com/v0/b/behard-39e84.appspot.com/o/legal-docs%2FBeHard-privacy-policy.html?alt=media&token=e05e95a4-b8e3-4f75-abb2-9fca8bff000e Subscription terms - https://firebasestorage.googleapis.com/v0/b/behard-39e84.appspot.com/o/legal-docs%2FBeHard-subscription-terms.html?alt=media&token=a8e15fb3-7794-4187-bb66-242c0ca7b8d8 Terms of service - https://firebasestorage.googleapis.com/v0/b/behard-39e84.appspot.com/o/legal-docs%2FBeHard-terms-of-use.html?alt=media&token=d1548142-e991-4ce7-af86-849f8e4a2a4e
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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
Redux
React Navigation
React Native Reanimated
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.
