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
3AK Track
3AK is your all-in-one performance system for speed, endurance, and discipline
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.3
65 ratings · Top 30%
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 included18 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 3AK Track: map the core Sports 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
Expand workout options to include more activities.
Assumption to check: Limited workout types may not cater to all users.
Validate with people who use this workflow before building.
Hypothesis 2
Implement advanced tracking features or integrations.
Assumption to check: Tracking accuracy may vary for different exercises.
Validate with people who use this workflow before building.
Hypothesis 3
Introduce personalized workout recommendations.
Assumption to check: User engagement may drop without personalization.
Validate with people who use this workflow before building.
Hypothesis 4
Simplify subscription tiers and clarify benefits.
Assumption to check: In-app purchase structure may confuse users.
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
3AK is your all-in-one performance system for speed, endurance, and discipline. Built for runners, athletes, and anyone committed to real progress, 3AK combines intelligent tracking, AI-driven coaching, and daily accountability into one powerful engine for transformation. Track your calories with precision, follow custom workout programs, and complete daily challenges designed to push consistency and mental toughness. Use advanced AI stride analysis to break down your running form, identify inefficiencies, and improve speed and energy output. Train smarter with real-time insights that evolve as you do. With your built-in AI coach, every user gets personalized guidance, motivation, and training feedback throughout the day. Whether your goal is fat loss, endurance, speed, or overall athletic performance, 3AK adapts to your lifestyle and training level. Key Features: AI-powered stride and running form analysis Smart calorie tracking and nutrition insights Custom workout programs for all performance levels Daily challenges to build consistency and discipline Real-time AI coaching and motivation Performance tracking across speed, endurance, and output 3AK isn’t just a fitness app—it’s a system built for people who take their performance seriously. No gimmicks. No wasted workouts. Just real results through structure, accountability, and intelligent training. Privacy policy: https://app.termly.io/policy-viewer/policy.html?policyUUID=019ea327-0891-49fc-98db-0aa0828bb96d Terms of service: https://app.termly.io/policy-viewer/policy.html?policyUUID=d3cbe04f-3efc-4612-86ab-83971d8c244e EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ **All features are behind a paywall**
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-navigation/native
expo
supabase-js
react-native-elements
react-native-svg
zustand
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.
