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
Gymdex: Share Workouts
#1 app to save workouts from Instagram, TikTok & Facebook!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
1,061 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/
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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 Gymdex: Share Workouts: 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
Implement a personalized recommendation system based on user preferences.
Assumption to check: Users find it difficult to discover new workouts.
Validate with people who use this workflow before building.
Hypothesis 2
Add social features like workout challenges and friend connections.
Assumption to check: Limited social interaction features.
Validate with people who use this workflow before building.
Hypothesis 3
Integrate workout tracking functionalities with progress visualizations.
Assumption to check: Lack of workout tracking features.
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the subscription model and clearly communicate the benefits of premium features.
Assumption to check: In-app purchases can be confusing.
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
#1 app to save workouts from Instagram, TikTok & Facebook! Gymdex organizes all your favorite workouts in one place. Save routines from Instagram & TikTok. Build custom workout plans, track your progress, and never lose a great workout again. Gymdex is your personal workout vault, planner, and progress tracker all in one app. --- FEATURES --- * Save Workouts from Instagram, TikTok – Found a great reel or short? Save workouts from social media in seconds. Exercises, sets, reps, and instructions are stored in an easy-to-read format. * Upload Workouts from Anywhere – Import your favorite routines from Notes, your camera roll, or even just talking to Gymdex. * Share Workouts – Send your favorite workouts to friends, training partners, or clients via SMS, email, WhatsApp, Messenger, AirDrop, and more. * Track Progress - See which muscles you worked out on any given day. Gymdex includes features requiring a premium subscription Unless you cancel at least 24 hours before the end of the free trial, you will be automatically charged the price indicated on the payment screen for your chosen subscription period. The Gymdex Premium subscription renews automatically at the end of each period (each month or year) until you cancel. Canceling your subscription will stop future renewals. However, you will still have access to all your subscription features for the remaining time of your current period. Note that deleting the app does not cancel your subscription. Terms of Use: https://www.trygymdex.com/terms Privacy Policy: https://www.trygymdex.com/privacy Have an idea to make your training experience with Gymdex better? Please email us at [email protected] so we can help!
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
Axios
React Query
Shadcn/ui
BUILD KIT DIFFICULTY
Advanced
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.
