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
Mullvad VPN
Free the internet from data collection with Mullvad VPN – a service that helps keep your online activity, identity, and location private
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.1
1,479 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.
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 included19 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 Mullvad VPN: map the core Utilities 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
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
< Scroll to see more >
App Store description
Free the internet from data collection with Mullvad VPN – a service that helps keep your online activity, identity, and location private. Only €5/month. GET STARTED 1. Install the app. 2. Create an account. 3. Add time to your account via in-app purchases, vouchers or on our website. To make sure to block third-party cookies and other tracking technologies – use Mullvad VPN together with Mullvad Browser (free of charge). ANONYMOUS ACCOUNTS – NO ACTIVITY LOGS * Creating an account requires no personal info - not even an email address. * We keep no activity logs. * We offer the possibility to pay anonymously with cash or cryptocurrency. * Our app uses WireGuard, a superior VPN protocol that connects fast and doesn’t drain your battery. HOW DOES MULLVAD VPN WORK? With Mullvad VPN, your traffic travels through an encrypted tunnel to one of our VPN servers and then onward to the website you are visiting. In this way, websites will only see our server’s identity instead of yours. Same goes for your ISP (internet service provider); they’ll see that you’re connected to Mullvad, but not your activity. It also means that all the third-party actors with technology integrated into the various websites you visit can’t sniff out your IP address and use it to track you from one site to another. Using a trustworthy VPN is a great first step to reclaim your privacy online. In combination with Mullvad Browser you make sure to block third-party cookies and other tracking technologies. FREE THE INTERNET FROM MASS SURVEILLANCE AND DATA COLLECTION A free and open society is a society where people have the right to privacy. That’s why we fight for a free internet. Free from mass surveillance and censorship. Free from big data markets where your personal information is up for sale. Free from authorities mass monitoring every click you make. Free from an infrastructure mapping your whole life. Mullvad VPN and Mullvad Browser is our contribution to the fight. TELEMETRY AND CRASH REPORTS The app collects a very minimal amount of telemetry, and it does not in any way tie it to an account number, IP or other identifiable information. Account numbers are used for authentication. App logs are never sent automatically but are rather explicitly sent by the user. App version checks are performed every 24 hours to tell the app if there are any upgrades available and if the currently running version is still supported.
Written user reviews are not shown here. Check current App Store reviews >
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
Implement a more robust reconnection strategy.
Assumption to check: Connection drops frequently
Validate with people who use this workflow before building.
Hypothesis 2
Add more servers and regions for users.
Assumption to check: Limited server locations
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the subscription model and improve clarity.
Assumption to check: In-app purchase confusion
Validate with people who use this workflow before building.
Hypothesis 4
Enhance support channels with real-time chat options.
Assumption to check: Slow customer support response
Validate with people who use this workflow before building.
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
axios
react-native-async-storage
@react-native-community/netinfo
expo-router
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.
