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.
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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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
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.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Happycapy: map the core Developer Tools workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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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
Assumption to check: Limited project management features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: In-app purchase process can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No offline access to projects
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of collaboration features
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Happycapy is an AI agent native computer in your browser and now on your phone. With 30k+ ready to use skills, 150+ built in APIs, and a secure personal cloud sandbox, it works for you 24/7. You can use agents to research, handle outreach, write code, create content, and manage operations all in one place. Happycapy has ranked #1 on both the weekly and monthly product on Product Hunt. AGENT-NATIVE EXPERIENCE Built from the ground up for agentic interaction. Instead of just answering questions, Happycapy AI takes on real tasks, breaks them down, executes each step, and reports back with results. BUILT-IN SKILLS LIBRARY Access a growing library of 30k+ purpose built skills for generation, coding, analysis, translation, summarization, brainstorming, and more. No prompt engineering required. CLOUD SANDBOX EXECUTION Delegate complex tasks to the cloud. This is why you can run Happycapy across both desktop and mobile, keep files consistent, and enable true 24/7 execution. Your local files stay untouched and secure. 150+ BUILT IN MODELS In addition to Claude models like Opus 4.7, Opus 4.6, and Sonnet 4.6, as well as Minimax m2.7 for agent workflows, Happycapy provides access to 150+ models that can be directly used by agents. No need to purchase or connect external APIs. 24/7 RUNNING AUTOMATION Set scheduled tasks and let Happycapy run them for you, even when your device is offline or powered off. SECURE BY DESIGN Your credentials are securely stored using the iOS Keychain. Your data stays private. Flexible Usage Options Happycapy AI is free to use with optional upgrades: - Subscribe to Pro for enhanced capabilities and higher usage limits - Pro subscribers can purchase additional credits through one-time in-app purchases that never expire Whether you're a professional looking to move faster, a creator seeking a thinking partner, or someone who wants AI that actually gets things done, Happycapy is built for you. Download Happycapy AI and experience what an AI agent can really do. SUBSCRIPTION TERMS ‣ Subscription options: Pro Monthly and Pro Yearly (auto-renewable) ‣ Pricing varies by region and is shown in-app ‣ Payment will be charged to your Apple ID 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 ‣ Your account will be charged for renewal within 24 hours prior to the end of the current period ‣ You can manage and cancel your subscriptions in your App Store account settings Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://happycapy.ai/privacy
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.