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
Instock: Shopping
YOUR PERSONALIZED SHOPPING ASSISTANT
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
15 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/
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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 Instock: Shopping: 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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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 push notifications for stock alerts.
Assumption to check: Limited product availability notifications
Validate with people who use this workflow before building.
Hypothesis 2
Include comprehensive product details and specs.
Assumption to check: Lack of detailed product descriptions
Validate with people who use this workflow before building.
Hypothesis 3
Enhance filtering and sorting options for reviews.
Assumption to check: Inadequate user reviews filtering
Validate with people who use this workflow before building.
Hypothesis 4
Add support for price comparisons across multiple retailers.
Assumption to check: Missing integration with external shopping platforms
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
YOUR PERSONALIZED SHOPPING ASSISTANT Get the instock app and start shopping in real-time! Select your products of interest, build your customized product feed, and you're all set to never miss a drop or restock. You'll receive notifications as your items of choice are made available across hundreds of retailers. You can also browse our discounts-only feed that exclusively shows discounted products. --- REAL-TIME NOTIFICATIONS Get alerts for the products that matter to you, right when they are available. EXTENSIVE PRODUCT SUPPORT From sneakers to consoles, clothing to electronics, sports equipment or home goods, we aim to facilitate your purchases, whatever the item is. We constantly update our product catalogue to support user requests and latest trends. LIVE RELEASE FEED See product drops and restocks as they happen. CUSTOMIZED PRODUCT FEED Build your personalized product feed based on the items you are looking for. DISCOUNTS-ONLY FEED Filter through on-sale drops and restocks and find steals. FASTER PURCHASES Speed up checkouts using direct add-to-cart links and autofills (premium features). --- Upgrade to instock Premium - Unlock up to 50 different products for your personalized product feed. - Receive prioritized notifications 45 seconds before free users. - Get add-to-cart links for hundreds of sites, directly in the monitors and custom product feeds. - Save time at checkout with autofill - Enjoy an ad-free experience by getting rid of display banners on every tab. Premium subscription notes - Subscription is currently exclusively available via Apple. - Subscription will be charged to your App Store account. - Subscription renews unless you disable renewal at least 24 hours prior to the renewal. - Apple charges subscription renewal around 24 hours prior to the end of the current subscription period. - Subscription can be managed directly from the App Store > My Account > Subscription. --- Terms & Conditions: https://getinstock.app/terms Privacy Policy: https://getinstock.app/privacy
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
Supabase
React Navigation
React Native Reanimated
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.
