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
Her 75
Her 75: the app to complete a 75-day challenge with your friends and see your friends to-do lists in real time.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
4,394 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Her 75: 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
Offer a wider variety of customizable workouts and templates.
Assumption to check: Limited workout types and templates
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate social challenges and community features to enhance user engagement.
Assumption to check: Inadequate social features
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to upload and track progress photos over time.
Assumption to check: No progress photo tracking
Validate with people who use this workflow before building.
Hypothesis 4
Implement AI-driven personalized workout suggestions based on user history.
Assumption to check: Lack of personalized recommendations
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
Her 75: the app to complete a 75-day challenge with your friends and see your friends to-do lists in real time. Begin your transformation through challenges such as: - 75 Soft - 75 Medium - 75 Day Hard - Glow Within - Better Me - Sugar Free - Mental Wellness You can also create your own custom challenge. Each day, you can track your water intake, check off your personalized to-do list, and your tasks are fully customizable. Her 75 Subscription Plan : - Weekly: $7.99 - Monthly: $14.99 - Yearly: $49.99 Payments and Renewal: * Payment will be charged to your Apple ID account at the confirmation of purchase. * Subscriptions automatically renew unless auto-renew is turned off at least 24 hours before the end of the current period. * Your account will be charged for renewal within 24 hours before the end of the current period. * You can manage or turn off auto-renew in your Apple ID account settings at any time after purchase. * No cancellation of the current subscription is allowed during the active subscription period. Privacy Policy – https://defiant-price-541.notion.site/Privacy-Policy-2175c452c61a80af9976c080a6ecdd8c?source=copy_link Subscription Terms – https://defiant-price-541.notion.site/Subscription-Terms-2175c452c61a809bbec7e9943ae4a4bd?source=copy_link Terms of Use – https://defiant-price-541.notion.site/Terms-of-Service-2175c452c61a80b48e3bf74493783ed3
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
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BUILD KIT DIFFICULTY
Expert
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.
