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
UserAgent Switcher
3.5K+ Downloads and Counting!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 1.0
2 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 included15 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 UserAgent Switcher: map the core Developer Tools 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 customizable user agent presets.
Assumption to check: Limited user agent options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Improve UI with modern design and user-friendly navigation.
Assumption to check: Poor user interface and experience
Validate with people who use this workflow before building.
Hypothesis 3
Integrate help sections and tooltips for better guidance.
Assumption to check: Lack of detailed help/support for users
Validate with people who use this workflow before building.
Hypothesis 4
Implement cloud backup for user preferences.
Assumption to check: No backup/restore feature for user settings
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
3.5K+ Downloads and Counting! UserAgent Switcher is a feature-rich yet lightweight browser app that allows you to switch between mobile and desktop web views with a single tap. Perfect for developers checking displays and power users conducting tests. Equipped with essential daily features like smart address bar input, bookmarks, history saving and revisiting. Its intuitive, simple design offers a smooth web browsing experience. With full control over UserAgent settings, you can instantly switch between mobile and PC websites for more flexible viewing. When a web page is hard to view or you prefer the desktop version, this app has you covered. Ideal for development, testing, and everyday browsing—all in one. The app supports multiple languages. In addition, a premium subscription is available to remove ads and enjoy a smoother browsing experience. 【Subscription Plans】 • Monthly Plan: $3.99 / month • Annual Plan: $34.99 / year ※ Prices may vary depending on your country or region. ※ Payment will be charged to your Apple ID account at confirmation of purchase. ※ Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. ※ Your account will be charged for renewal within 24 hours prior to the end of the current period. ※ You can manage or cancel your subscription in your App Store account settings after purchase. Privacy Policy: http://uaswitcher.kyotohan.com/privacypolicy/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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
Zustand
Axios
React Navigation
Expo Secure Store
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.
