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
Zacks Mobile App
Zacks Investment Research is a leading provider of independent investment research with a proven track record of outperforming the market
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.2
3,996 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 included18 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 Zacks Mobile App: map the core Finance workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Zacks Investment Research is a leading provider of independent investment research with a proven track record of outperforming the market. The content for this application is provided by Zacks Investment Research and offers access to the proven Zacks Rank—and its average gain of +26% per year—and Zacks’ proprietary research for trading success while on the go. The Zacks Mobile App distills the essential data elements of the Zacks research methodology to a simple series of views that are perfect for the on-the-go investor. Stay on top of stocks, mutual funds, and ETFs you’re most interested in—right on your iPhone. Zacks mobile app lets you: • See the Zacks Rank which indicates potential outperformance based on earning estimate revisions and surprises. • View the current price/share, price change, and percent price change. • Access detailed earnings statement for this quarter and next, yearly information, as well as quarterly and yearly earnings trends, • Find surprise history and earnings ESP for each quarter and yearly information • View average broker recommendations. • Look up the key earnings and ratings statistics, for which Zacks is known, along with the latest commentary insights from Zacks’ team of experienced research analysts and market strategists. Plus, enjoy these great features: • Search for stock tickers, keywords or companies • Add stocks to your Watchlist • Get investing ideas • See the market overview from the Dow Jones, S&P 500, or Nasdaq • Obtain time-delayed intra-day quotes • Read the newest news and articles from Zacks
Written user reviews are not shown here. Check current App Store reviews >
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
Offer more robust features in free tier to attract users.
Assumption to check: Limited free features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Optimize data fetching and caching mechanisms.
Assumption to check: Slow loading times for data-heavy screens
Validate with people who use this workflow before building.
Hypothesis 3
Ensure responsive design and thorough testing on various devices.
Assumption to check: Inconsistent user experience across different devices
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate personalized stock recommendations based on user preferences.
Assumption to check: Lack of personalized insights
Validate with people who use this workflow before building.
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
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.
