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
IZFit - Track Workout Progress
transform your gym sessions with izfit — the beautifully designed workout tracker that makes logging your lifts effortless.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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
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A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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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 included15 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 IZFit - Track Workout Progress: 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 more detailed logging for exercises, sets, and reps.
Assumption to check: Lack of detailed workout tracking features
Validate with people who use this workflow before building.
Hypothesis 2
Add support for Apple Watch and Fitbit for automatic tracking.
Assumption to check: No integration with wearables
Validate with people who use this workflow before building.
Hypothesis 3
Include social challenges and sharing options to engage users.
Assumption to check: Limited social features
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to upload progress photos to track their visual changes.
Assumption to check: No progress photos feature
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
transform your gym sessions with izfit — the beautifully designed workout tracker that makes logging your lifts effortless. log workouts fast add exercises, sets, reps, and weight in seconds. choose from 90+ exercises organized by muscle group — chest, back, shoulders, legs, arms, core, and more. no complicated setup, just tap and lift. track your progress watch your strength grow with visual progress charts. see your volume trends over 7, 30, or 90 days. personal records are tracked automatically — every new pr is celebrated. stay consistent daily streak tracking keeps you motivated. quick stats show your workouts this week, total sessions, and lifetime volume lifted. your dedication, visualized. set & crush goals create custom fitness goals with deadlines. get smart milestone suggestions and track your progress with visual bars. turn "someday" into "done." features * •90+ exercises across all muscle groups * •personal record tracking for every lift * •volume trend charts (weekly, monthly, quarterly) * •daily workout streaks * •custom goal setting with milestones * •clean, dark theme designed for the gym * •switch between lbs and kg instantly * •workout notes and duration tracking 14-day free trial try everything free for 14 days. no commitment. then just $2.99/month to keep crushing it. built for lifters who want results without the clutter. terms of use: https://zaeemshaukat.github.io/izfit-legal/terms privacy policy: https://zaeemshaukat.github.io/izfit-legal/privacy
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
Zustand
React Navigation
react-native-chart-kit
AsyncStorage
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.
