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
Nextin
Nextin is a subscription-based configuration and connection tool designed to simplify the setup process and improve everyday usability.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 2.7
137 ratings · Below Average
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 included17 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 Nextin: map the core Utilities 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
Add more advanced task management features like sub-tasks.
Assumption to check: Limited features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Focus on robust testing and bug fixes.
Assumption to check: Poor user ratings due to bugs
Validate with people who use this workflow before building.
Hypothesis 3
Implement a cleaner, more organized layout.
Assumption to check: Cluttered UI
Validate with people who use this workflow before building.
Hypothesis 4
Optimize app performance and load times.
Assumption to check: Inconsistent performance
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
Nextin is a subscription-based configuration and connection tool designed to simplify the setup process and improve everyday usability. Users can quickly obtain a complete configuration by entering a service provider’s site identifier, or by importing a subscription URL directly, eliminating the need for any manual configuration. The app is powered by the Clash Meta core, offering strong compatibility and stable performance. It supports a wide range of modern network protocols, including: • VLESS / VLESS XTLS / Reality • Anytls • Trojan / Trojan XTLS • VMess • Shadowsocks • ShadowsocksR • Hysteria / Hysteria2 • TUIC With its advanced core and protocol support, Nextin delivers efficient connections and reliable performance across different network environments. Built with native SwiftUI, Nextin features a clean, intuitive interface and smooth interactions, ensuring a seamless user experience. The app includes a comprehensive set of built-in traffic routing rules, which intelligently handle traffic based on network conditions and usage scenarios, without requiring manual intervention. Nextin also integrates in-app support access, allowing users to directly contact their chosen service provider for assistance and inquiries, making the overall experience more convenient and streamlined. Nextin is designed to reduce complexity, enabling users to complete configuration effortlessly and enjoy a stable, smooth, and reliable experience.
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
Firebase
React Navigation
Redux
TypeScript
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.
