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
SOTKA: Fitness Minimalism
SOTKA has already helped 1 000 000 people all over the world to transform their lives! Now it is available in English!
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
56 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 included18 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 SOTKA: Fitness Minimalism: 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
Include customizable workout templates and a wider exercise library.
Assumption to check: Limited exercise variety in preset workouts
Validate with people who use this workflow before building.
Hypothesis 2
Add social challenges and sharing capabilities.
Assumption to check: No social features for user engagement
Validate with people who use this workflow before building.
Hypothesis 3
Offer more free content before paywall to improve retention.
Assumption to check: Paywall appears too soon for users
Validate with people who use this workflow before building.
Hypothesis 4
Integrate detailed analytics and insights for user performance.
Assumption to check: Lack of in-depth progress analytics
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
SOTKA has already helped 1 000 000 people all over the world to transform their lives! Now it is available in English! This is a free educational course developed for those, who only start their training or get back on a track after a long break or injury. Our main goal - to educate and train people of any age, gender or physical conditions. SOTKA program is designed for 100 days, during which you will everyday get new useful information and perform training complexes consisted of basic bodyweight exercises. SOTKA is divided into 2 big theory blocks, each covering all the main topics and providing answers to all your questions. BASIC Block (Day 1 to Day 49): - Detailed review of bodyweight exercises; - Detailed review of nutrition; - Infoposts with answers to the most popular beginner's questions: how to breath, how to improve flexibility, how to train during summer/winter, how to learn pull-ups from scratch, how much water to drink, how long should training session be and etc. ADVANCED Block (Day 50 to Day 91): - Exercise's biomechanics and muscle work; - New training techniques every week; - Detailed review on different body systems; - Practicum on training programms development; TURBO Block (Day 92 to Day 98): - Challenge yourself with 7 unique training routines; APPLE WATCH & APPLE HEALTH: - train using the Apple Watch; - track your progress through the Health application (the app requests access to Health to obtain data on heart rate, personal parameters and training data).
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.
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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.
