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
BlendJunk
BlendJunk is the gas blending app for technical divers and fill stations
$3.99
PRICE
$3.99
No 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
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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.
JavaScript is required to complete mailbox verification.
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 BlendJunk: map the core Sports workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Continue in Rork >
Affiliate link: CloneChart may earn a commission at no extra cost
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
Enhance community features with chat or forums
Assumption to check: Limited community interaction features
Validate with people who use this workflow before building.
Hypothesis 2
Provide advanced analytics and personalized recommendations
Assumption to check: Lack of detailed performance analytics
Validate with people who use this workflow before building.
Hypothesis 3
Implement sharing features to showcase blends on social media
Assumption to check: No social sharing options
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a free trial or freemium model for user acquisition
Assumption to check: High upfront cost without trial
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
BlendJunk is the gas blending app for technical divers and fill stations. Connect your oxygen analyzer wirelessly via Bluetooth and let the app do the rest. ANALYZE Connect your OxyJunk, Divesoft or DNA analyzer via BLE. The app instantly shows your O₂ and He values and automatically calculates the MOD based on your ppO₂ limit. BLEND Enter your start and target pressure, choose your target mix and BlendJunk calculates exactly how much of each gas to add. Including fill order and top-up gas selection. PRINT Print a professional cylinder label with all gas data directly to your Brother label printer. Scan a cylinder with NFC or QR and the cylinder ID appears automatically on your label. WIRELESS Connect your wireless pressure sensor (WLB-PT) to automatically read cylinder pressure. No more manual input needed. FLEXIBLE No analyzer at hand? Enter your values manually and use BlendJunk as a standalone blend calculator. Features: • Bluetooth connection with OxyJunk, Divesoft and DNA analyzers • Trimix, Nitrox and Heliox support • Automatic MOD calculation • Gas blend calculator with fill steps • NFC and QR cylinder identification • Direct label printing via Brother QL-1110NWB • WLB-PT wireless pressure sensor support • Works offline, no account needed
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
< Scroll to see more >
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
Supabase
react-navigation
victory-native
react-native-paper
BUILD KIT DIFFICULTY
Starter
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.
