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
Holafly eSIM: Unlimited Data
Holafly is your best travel companion
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
38,005 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 included17 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 Holafly eSIM: Unlimited Data: map the core Travel 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
Offer multiple payment methods such as Apple Pay, Google Pay, and cryptocurrency.
Assumption to check: Limited payment options can frustrate users.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a step-by-step guide for users to troubleshoot activation problems.
Assumption to check: Connectivity issues with eSIM activation.
Validate with people who use this workflow before building.
Hypothesis 3
Integrate in-app chat support for instant assistance.
Assumption to check: Lack of customer support features.
Validate with people who use this workflow before building.
Hypothesis 4
Add a centralized dashboard to manage and view all eSIMs easily.
Assumption to check: Complexity in managing multiple eSIMs.
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
Holafly is your best travel companion. Stay connected wherever you go with Holafly's eSIM cards and enjoy Unlimited Data plans worldwide. What is an eSIM card? An eSIM card provides mobile data like a regular SIM card but is digital and international, eliminating expensive roaming fees. You can use an eSIM alongside your local SIM card to receive FaceTime calls, iMessages or WhatsApp messages with your regular number. Why Choose Holafly? Holafly is your go-to international prepaid eSIM provider, offering Unlimited Data with quick, easy connectivity. With Holafly’s eSIM, you get: Connection Anywhere, Anytime Enjoy fast, reliable Internet access during your international travels in over 200 destinations, with multiple plan options, with unlimited and limited data, that can be adapted to the days of your trip. Connect to the internet within minutes and enhance your travel experience. Cost-Effective Connectivity Travel without the fear of extra expenses. Holafly offers prepaid eSIM cards with Unlimited Data coverage in over 200 destinations, including Europe, Mexico, China, Turkey, Japan, and the USA. You can also purchase limited data plans for other destinations and top-ups for extra data. Easy Installation & Activation Purchase your eSIM through the Holafly App with Apple Pay, Credit card or PayPal. Receive your eSIM in your email within just seconds. Install your eSIM seamlessly through the Holaly App with the help of our guides, videos, and offline content. The eSIM data will only start to be consumed once at your destination. Data Plan Insights Track your eSIM data usage, activation, and expiration dates through the app of one or multiple eSIMs. Top-up your eSIMs anytime you need extra data. Universal Compatibility Holafly's eSIM is compatible with all iPhones with technology-enabled eSIM (from iPhone XS, XR onwards). Check our compatibility guide for details. How to Buy an eSIM? Choose Your Plan Download the app and choose your destination, select a plan according to your travel schedule, and continue to checkout (you can save your payment information for later purchases). You’ll receive your eSIM via email in seconds and can log in to the app to manage and set up your card. Set Up Your eSIM Install and activate your eSIM through the app. Log in using your email or your Apple account (make sure it matches the one you used for purchase). For iOS 17.4+ users, enjoy one-button installation. Alternatively, use QR or manual codes for setup, you can find step-by-step guides in our app; they are also sent by email. Activate Your Data Once you finish installing your eSIM, activate data roaming. Data will only start consuming once at your destination. Track data usage in real-time within the app of all your available eSIMs. That’s it! Start enjoying internet connectivity for all your trips. 24/7 Support Need help? Contact our multilingual support team anytime inside the app with one button. We’re here to assist with the eSIM setup and any other questions. Embark on your adventures with Holafly – made with love by people who love to travel. Stay connected worldwide—download the Holafly App now!
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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
Supabase
React Navigation
Axios
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.
