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
HotStock - in-stock alerts
HotStock is the only app that tracks the stock and price of hard-to-get products in real-time!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
15,225 ratings · Top 15%
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 HotStock - in-stock alerts: map the core Shopping workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
HotStock is the only app that tracks the stock and price of hard-to-get products in real-time! Trying to get hold of must-have products? Be notified when they're back in stock. Products range from the new Pokemon, Playstation 5 (PS5), Nintendo Switch, Xbox Series X console bundles, Meta Quest, NVIDIA Geforce RTX 4080 / 4090 graphics cards, Ninja air fryer, LEGO, Magic Mixies, Gabby's Dollhouse, Barbie dolls, CoCoMelon through to other hard-to-get tech and toys. Just find the product you're interested in, then click the ALERT ME button and we'll instantly send you a notification when it's back in stock and available to buy. We track them so you don't have to. There's no need for you to keep checking when they're back in-stock, or stay logged in to every retailer's website. You'll never have to miss out on that must-have product again! When you get our notification, compare prices and quickly buy before it goes out of stock again. SELLING OUT TOO FAST? Enable AutoBuy for fast, automated purchasing within seconds. Unattended checkout while you sleep/work/play. AutoBuy puts the fans back in the game in the fight against bots! ADD PRODUCTS - MAKE YOUR VERY OWN WATCH LIST Looking for something that’s not on our Featured list? Just use the Search bar to add your own custom products to your list! Please note: this app is totally free to use. You also have the option to unlock HotStock Premium/AutoBuy to get all the benefits of the Premium/AutoBuy tiers. These tiers allow you to add more of your own custom products, puts you first to receive alerts about new stock compared to free users, and the AutoBuy provides you with fast, unattended checkout. The cost of these tier subscriptions will be displayed in the app, prior to your agreement. If you choose to upgrade your payment will be taken immediately and processed by Apple. Premium/AutoBuy tier subscriptions automatically renew monthly unless auto-renew is turned off at least 24-hours before the end of the current period. Your Apple account will be charged for renewal within 24-hours prior to the end of the current period, and will identify the cost of the renewal. You may manage and turn off auto-renewal after purchase by going to your Apple Account Settings. Terms of use The HotStock app is copyright HotStock.io 2023. All rights reserved. Terms of use and privacy policy apply when using and accessing content in the HotStock app. • Privacy policy: https://www.hotstock.io/privacy-policy • Terms and conditions: https://www.hotstock.io/terms
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 real-time notifications with better accuracy.
Assumption to check: Alerts may not be timely or accurate.
Validate with people who use this workflow before building.
Hypothesis 2
Enhance search functionality with filters and categories.
Assumption to check: Limited product discovery features.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify navigation and onboarding process.
Assumption to check: User interface can be confusing for new users.
Validate with people who use this workflow before building.
Hypothesis 4
Add social sharing features for product alerts.
Assumption to check: No social sharing options.
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
Supabase
Axios
React Navigation
React Native Push Notification
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.
