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
Talking Carl
Talk, Sing and Play with Carl
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.3
728 ratings · Top 30%
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 Talking Carl: map the core Entertainment 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
Add more interactive effects and mini-games.
Assumption to check: Limited interactive features compared to other entertainment apps
Validate with people who use this workflow before building.
Hypothesis 2
Implement adaptive audio quality settings.
Assumption to check: Audio quality may vary based on device
Validate with people who use this workflow before building.
Hypothesis 3
Enable sharing recorded messages on social media.
Assumption to check: Lack of social sharing options
Validate with people who use this workflow before building.
Hypothesis 4
Introduce new content or themes regularly.
Assumption to check: Repetitive interaction can get boring
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
Talk, Sing and Play with Carl. Tickle, punch, feed him and hear his funny laughs, growls and more! #1 Worldwide: Carl reached #1 charts and has been featured all over the world. Talking Carl is the very first and still the funniest talking character of the App Store, he invented fun! We think about small kids too: Use the Baby mode without any buttons... only Carl and no trouble! --------------- Features -------------- • Talk to him and he'll repeat your words with an hysterical voice. • Feed him with bones • Strike him by lightning • Tickle him and he will laugh out loud. • Poke his eyes and he will shout and yell. • Pinch him to hear him growling. • And if you forget him he will grumble. • Very Polite, he even says Goodbye. + Swipe up and he will fly... and fall + swipe down and hear the thunder + swipe left or right and he'll make a round-turn. Talking Carl is hours of laugh for children of any age. Parents, you'll love him too for the peacefulness it gives you while your kids are playing with him. But don’t try it! you’ll never give it back to them. --------- Our users says --------- "The only talking app that I recommend - There are quite a few of talking apps but Talking Carl is the best! I especially like that I can remove all the buttons so that my daughter will not be confused" "Great app for the kids! - My kids love playing with this app and found it easy to share the videos"
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.
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BUILD KIT DIFFICULTY
Starter
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.
