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
Grok AI
Grok is a powerful AI assistant developed by xAI
Free · In-app purchases
OVERALL US RANK
#23
Grossing · all categories
REVENUE (Est)
$626K/mo
$367K - $885K
RATING
★ 4.9
1,426,997 ratings · Top 5%
Evidence scope: #23 is the current overall US Grossing chart position. 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 included19 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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Grok AI: map the core Productivity 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
Design a more minimalistic interface with clear categorization.
Assumption to check: Users often find task management apps overwhelming due to cluttered interfaces.
Validate with people who use this workflow before building.
Hypothesis 2
Implement customizable reminders with notifications.
Assumption to check: Many apps lack effective reminders, leading to missed deadlines.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance collaboration features with real-time updates and comments.
Assumption to check: Users struggle with collaboration features in task apps.
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the subscription options and clearly communicate benefits.
Assumption to check: In-app purchase models 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
Grok is a powerful AI assistant developed by xAI. Designed to be maximally truthful, useful, and curious, Grok helps you get better answers, create faster, and understand the world in real time. Whether you need intelligent conversation, advanced research, coding help, or high-quality image and video generation, Grok delivers. AI Assistant Ask anything and get fast, well-reasoned replies. Have Grok do deep research on the web, solve complex problems in math, science, and coding, or analyze documents, photos, and links in the chat. This AI assistant turns complicated topics into clear, actionable insights and can handle multi-step tasks with strong reasoning. Grok Imagine – AI Image and Video Generation Experience fast and powerful AI image and video creation. Generate striking images from text, create short videos with sound, or turn your photos into dynamic videos. You can even generate images using just your voice. Edit existing images by removing objects, changing backgrounds, or applying artistic styles — all with precise control and high quality. Grok Voice Mode Have natural voice conversations with Grok. Talk to your AI assistant and receive human-like replies in real time. Personalize how you interact and choose different conversation styles that match your needs. Real-Time Information from X Get the most up-to-date answers. With direct access to X and the web, this AI assistant keeps you informed about the latest news, trends, and conversations happening right now. Ask Grok to perform advanced searches on X and discover what people are really saying. Easily Transfer Context to Grok Already using ChatGPT, Claude, Gemini or other AI tools? Easily transfer your conversations and context to Grok so you can continue working without starting over. Real-World Use Cases Students use Grok to study and get clear explanations. Professionals rely on it for research, writing, analysis, and problem-solving. Content creators generate custom images and videos in seconds. Developers get strong coding help and technical insights. Anyone who wants a fast, truthful, and creative AI assistant can benefit from Grok. Who Is Grok For? Grok is built for curious people who want more than basic answers. It’s perfect for students, professionals, creators, researchers, and anyone looking for a powerful AI chat experience combined with advanced image, video, and agent capabilities. If you value truth-seeking, creativity, and real-time knowledge, Grok is made for you. With Grok as your personal AI assistant, navigating knowledge, sparking creativity, and getting real work done becomes faster and more exciting. Download Grok today and experience what a truly helpful AI can do. Terms of Service: https://x.ai/legal/terms-of-service Privacy Policy: https://x.ai/legal/privacy-policy Grok by xAI
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
Zustand
React Navigation
Axios
Day.js
BUILD KIT DIFFICULTY
Advanced
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.
