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
Hummingbird Tracker
Download the Hummingbird Guide's Hummingbird Tracker app, to keep track of the hummingbird Spring migration
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.1
29 ratings · Below Average
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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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Hummingbird Tracker: map the core Lifestyle 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
Expand database with user contributions and expert reviews
Assumption to check: Limited species database compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Simplify navigation and improve visual hierarchy
Assumption to check: Confusing user interface
Validate with people who use this workflow before building.
Hypothesis 3
Focus on stability and bug fixes in the clone
Assumption to check: Frequent crashes and bugs reported
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a free tier or trial period to attract users
Assumption to check: High subscription cost without clear value
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
Download the Hummingbird Guide's Hummingbird Tracker app, to keep track of the hummingbird Spring migration. Follow the hummingbirds as they move from their Winter habitat in the South and Central Americas travelling through the US and Canada to their Summer destinations throughout North America. This app has an interactive migration map of our visitor posted sightings as the hummingbirds travel along their migration route. Use our sighting submission form, included in this app, to submit/post your sightings to the interactive map as these gorgeous little creatures visit your home. The App Features included in our app: - Hummingbird Sighting Submission Form. - Interactive Migration Map which shows all sightings submitted by our visitors. - Homemade Nectar Recipe to fill your feeders when your hummingbirds arrive with a "Printable Version". - Hummingbird Feeder Reviews of the best most common styles. - Hummingbird Identifier of the 8 most common hummingbirds in North America. - Hummingbird Garden Designing recommendations. - FAQ's of the 6 most common questions about feeding hummingbirds. - App Coupon for a discount in our store with unique feeders, accessories, birdbaths, gifts and more. - Newsletter sign-up form link to get the latest news, store promotions, featured articles all about hummingbirds. - The Hummingbird Blog to keep up with the latest information from "The Hummingbird Guide". PLEASE NOTE: You will not see your submission on the map immediately. The map is updated periodically through the day. To those of you in the South, we ask you to please post your sightings to keep the rest of us up to date on the migration as our beloved hummingbirds travel northward. Everyone is anxiously awaiting their arrival and your sightings will help everyone to get ready!
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
Supabase
TypeScript
react-navigation
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.
