App Overview

Chirp! Bird Songs UK & Europe icon

Chirp! Bird Songs UK & Europe

Spiny Software Ltd · Reference

As seen on Alexander Armstrong's phone on the BBC's Michael McIntyre's Big Show

$3.99 · In-app purchases

PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.9
7 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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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.

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.

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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> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Chirp! Bird Songs UK & Europe: 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

Expand the library with more bird songs and user contributions.

Assumption to check: Limited bird song library compared to competitors

Validate with people who use this workflow before building.

Hypothesis 2

Implement offline access to downloaded bird songs.

Assumption to check: No offline access

Validate with people who use this workflow before building.

Hypothesis 3

Add features to share bird songs and identifications with friends.

Assumption to check: Lack of social features

Validate with people who use this workflow before building.

Hypothesis 4

Redesign UI to be more visually appealing and user-friendly.

Assumption to check: User interface could be more modern

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

As seen on Alexander Armstrong's phone on the BBC's Michael McIntyre's Big Show Simon Mayo, radio presenter: "Great app... Everyone loves it... Can I request a Bittern?" Chosen by Apple for "Apps for the Great Outdoors" "Identifying a bird by its song is fun and satisfying and this app is a great help" - The Telegraph, 500 Must-Have Apps "Equal parts wildlife guide and feel-good pick-me-up" - The Guardian, "Top 10 Green Apps" Chirp! includes songs and calls for 260 birds, and includes special features such as a ‘human translation’, to tell you what the bird is actually saying. The identification and learning of bird songs can be hard, but not with Chirp!. A short description and helpful tips are given for each song or call, as well as a photo of each bird. Birds can be sorted by commonness, so you can listen to the most common ones first, then move on to rarer species. Or sort by song style, so that you can compare birds that hoot and coo, or those with high pitched songs for example. You can also sort by name, habitat or bird group. After listening, try the quiz to test your memory. Answer fast to earn a score multiplier and get on the high score table. Experienced birders can use the custom quiz to help distinguish and learn similar songs. The slideshow section can be used as a way to relax, or switch the voiceover on and see if you can say the name of the bird before the voiceover. This is a good way of competing with the family - who can say the name of the bird first?! Includes birds from Britain, Ireland, France, the Netherlands, Switzerland, Germany, Denmark, Norway, Sweden, Spain, Portugal and Italy.

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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
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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.