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
Cookie Calls
This is an app full of fun phone calls from Cookie Monster, which will help teach your child about life skills and milestones.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.3
185 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/
Preview a sample Build Kit No email needed
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 Cookie Calls: map the core Education 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 broader range of characters and themes to maintain interest.
Assumption to check: Limited content variety can lead to user disengagement
Validate with people who use this workflow before building.
Hypothesis 2
Add a search/filter feature for call history.
Assumption to check: Difficulty in navigating to specific past calls
Validate with people who use this workflow before building.
Hypothesis 3
Enable offline downloads for calls, allowing users to access content anytime.
Assumption to check: No offline access to calls
Validate with people who use this workflow before building.
Hypothesis 4
Provide clearer explanations and previews of in-app purchase content.
Assumption to check: In-app purchases can be confusing
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
This is an app full of fun phone calls from Cookie Monster, which will help teach your child about life skills and milestones. Ring Ring, Cookie Monster here! Sesame Street's blue, cookie-loving monster wants to video chat with you! Receive video calls and voice messages, and when you call Cookie he is always there to answer. FEATURES • Receive video calls from Cookie Monster, or dial Cookie yourself! • Receive voicemail from Cookie regularly and listen to the messages any time. • See live video of yourself in the corner of the screen while you're chatting with Cookie. • Grown-ups can activate calls or schedule calls for a variety of situations, such as nap time (more calls for getting ready to go, time to wake up, bedtime, brushing teeth and getting dressed available with additional call packs). LEARN ABOUT Cookie Calls encourages children to engage in a variety of healthy habits, from washing your hands to eating fruits and vegetables. This app also helps parents establish daily routines for their children. CALL PACKS The Cookie Calls sampler pack comes with your purchase of this app. This initial pack gives a taste of all the fun things Cookie wants to tell you about, like healthy eating, math and more. For even more calls, download the "Fortune Cookie" call pack for FREE, plus you can buy additional call packs easily right within the app. • Fortune Cookie: Cookie Monster shares ancient wisdom that’s found inside of fortune cookies. (FREE) • Eat Your Colors: Cookie Monster calls to talk about, and eat, some of his favorite healthy foods like apples, avocados, and cauliflower! • Healthy Habits: Cookie Monster can’t wait to tell you about the joy of exploring nature, the importance of getting exercise, and lots of other healthy habits! • Parent's Helper: Daily routines are easier when Cookie Monster calls to talk about getting dressed, getting ready for bed time, and more! • Laugh with Cookie: Cookie Monster just wants to make you laugh! • Sing with Cookie: Sing along to classic kids’ songs with Cookie Monster, or just listen! • Foods of The World: Cookie is on a trip around the world and wants to talk about new foods with you! TIPS • Please allow Push Notifications to receive scheduled calls from Cookie Monster! ABOUT US Sesame Workshop’s mission is to use the educational power of media to help kids everywhere grow smarter, stronger, and kinder. Delivered through a variety of platforms, including television programs, digital experiences, books and community engagement, its research-based programs are tailored to the needs of the communities and countries they serve. Learn more at www.sesameworkshop.org. ABOUT IDEO IDEO is a human-centered design and innovation firm ranked independently among the ten most innovative companies in the world. Learn how our team of child-development experts, veteran toy designers and interaction designers approach the creation of award-winning kid apps at www.ideotoylab.com. PRIVACY POLICY The Privacy Policy can be found here: https://sesameworkshop.org/about-us/legal/privacy-policy/ CONTACT US Your input is very important to us. If you have any questions, comments or need help, please contact us at: [email protected].
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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
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expo-av
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.
