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
PhilSnap: Stamp ID & Values
Discover the true value of your stamps with PhilSnap — the smarter way to identify, value, and organize any collection
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
2,257 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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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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for PhilSnap: Stamp ID & Values: map the core Reference 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 a community feature where users contribute stamp information.
Assumption to check: Limited database of stamps and values
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate a feature for users to upload higher quality images.
Assumption to check: Inconsistent image quality for stamps
Validate with people who use this workflow before building.
Hypothesis 3
Enhance the search functionality with better filtering options.
Assumption to check: Difficulty in finding specific stamps
Validate with people who use this workflow before building.
Hypothesis 4
Introduce social features like sharing collections and user profiles.
Assumption to check: Lack of user engagement features
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
Discover the true value of your stamps with PhilSnap — the smarter way to identify, value, and organize any collection. Just snap a photo to recognize a stamp, see trusted market prices, get grading tips, and save it to your digital album. Perfect for beginners sorting an inherited album, collectors building a catalog, or resellers needing fast, consistent valuations — PhilSnap is your all‑in‑one philately companion. What can PhilSnap do? - Accurate Market Valuation See real‑time price ranges by condition. Spot common issues vs. premium varieties before you buy, sell, or store. - Instant Stamp Identification Detect issuing country, year, face value, series/theme, watermark/printing type, and catalog references where available. - Condition Guidance Get grading suggestions (Fine, Very Fine, Extremely Fine, Superb) with cues on centering, perforations, gum, creases, and cancellations. - Variant & Error Awareness Flag potential varieties (perfs, color shades, overprints, plate flaws) to help you avoid mispricing. - Postmark Insights Note cancellations and covers that may add or reduce value. - Organize Your Collection Save scans, add notes and purchase data, track total value, and watch your collection grow. - Learn & Explore Read beginner guides, expert tips, and stories behind iconic issues and rare finds. Why Choose PhilSnap? Accurate — Reliable stamp valuation in seconds Effortless — Point, scan, and get details without manual search Insightful — History, catalog context, and market trends at a glance Organized — Build a clean, searchable digital album Premium Subscription Upgrade to Premium for unlimited identifications, exclusive market insights, and priority support. - Payment will be charged to your iTunes 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 - Account will be charged for renewal within 24 hours before the end of the current period - Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription - Subscriptions may be managed by the user, and auto-renewal may be turned off in iTunes settings Privacy Policy: https://app-service.stampsnapai.com/static/privacy_policy.html Terms of Use: https://app-service.stampsnapai.com/static/user_agreement_20210224.html
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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
Supabase
react-query
@supabase/supabase-js
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.
