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
Bold: Science-backed exercises
Bold is an at-home, online exercise program designed to help adults 65+ live their strongest, happiest, and healthiest lives.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
6,734 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.
Build your own version
Build Kit
Make this idea yours
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 Bold: Science-backed exercises: 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
Allow users to create fully custom workouts.
Assumption to check: Limited customization options for workouts
Validate with people who use this workflow before building.
Hypothesis 2
Integrate social challenges or community sharing.
Assumption to check: Lack of community features for motivation
Validate with people who use this workflow before building.
Hypothesis 3
Implement a more user-friendly paywall experience.
Assumption to check: In-app purchase prompts can be intrusive
Validate with people who use this workflow before building.
Hypothesis 4
Provide a more robust nutrition logging feature with a food database.
Assumption to check: Difficulty in tracking nutrition accurately
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
Bold is an at-home, online exercise program designed to help adults 65+ live their strongest, happiest, and healthiest lives. Designed by expert physicians, physical therapists, kinesiologists, and certified trainers, Bold provides science-backed, personalized exercise programs for adults aged 65 and above. Our proven balance programs decrease the risk of falls by more than 40%, while our pain programs effectively reduce joint pain by over 50%. Bold is available at no cost through select health plans. You may also sign up and use your flex card benefits or pay out-of-pocket for a membership. Bold Features: Personalized Program: Tailored exercise plans led by experts, customized for your fitness level, health conditions, and goals. Live Classes: Join daily live sessions with fellow Bold members. Explore 500+ Classes: Diversify your routine with online classes you can take any time, anywhere, including yoga, strength, tai chi, cardio, and more. Track Your Progress: Set and achieve goals, receive timely reminders, and celebrate milestones with our progress-tracking features. “I was delighted with the breadth of classes offered, the instruction was really good, I could do it at home, and I could do it at my convenience.” - Gerrie, 75 Feedback? Contact us at [email protected]
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-chart-kit
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.
