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
LiftOff - Compound Tracker
No more hidden in-app purchases
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
5 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
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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 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 LiftOff - Compound Tracker: 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 custom workouts and save templates.
Assumption to check: Limited workout tracking options
Validate with people who use this workflow before building.
Hypothesis 2
Include a community section for users to share progress and compete.
Assumption to check: No social features for challenges
Validate with people who use this workflow before building.
Hypothesis 3
Enhance with detailed analytics and insights for users.
Assumption to check: Basic progress tracking only
Validate with people who use this workflow before building.
Hypothesis 4
Integrate with health devices like Apple Watch for better tracking.
Assumption to check: Lack of device integration
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
No more hidden in-app purchases. No more irritating ads. LiftOff is an extremely simple workout tracker, with ONLY compound lifts to choose from: bench, squat, deadlift, or row. If you're someone who wants to get stronger, then tracking weights, reps, and sets is necessary for improvement. Focusing on compound lifts is important if you're a powerlifter or even if you're a casual gym-goer. Log your workouts in seconds, calculate your one-rep max, and stay consistent with your progress over time. Whether you're new to lifting or chasing PRs, LiftOff helps you stay focused and motivated by connecting with friends, setting new goals for yourself, and being awarded achievements. FEATURES - Track exercise, weight, reps, and sets - Calculate your one-rep max instantly - View past workouts and progress - Earn achievements - Write and store goals - Clean and easy-to-use design - Optional profile sharing with friends SUPPORT Questions or concerns? Visit our support page at: https://docs.google.com/document/d/1T3raCzgcEna_X__-GFBFoGezij0y9rr_89mOGZmNl9w/edit?usp=sharing or contact [email protected]. To learn more, visit our privacy policy at: https://docs.google.com/document/d/1mJW4QnR-fachEwQJvEOcYmHhacMBzXTgXJ5AljH5mx0/edit?usp=sharing
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/native
axios
react-native-chart-kit
@react-native-community/hooks
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.
