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
Speedtest by Ookla
Use Speedtest® for a quick, easy, one-tap connection internet speed test—accurate anywhere thanks to our global server network.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
28,095 ratings · Top 15%
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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Speedtest by Ookla: map the core Utilities 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 multiple testing servers for better accuracy.
Assumption to check: Occasional inaccurate results
Validate with people who use this workflow before building.
Hypothesis 2
Offer more functionality in the free version without ads.
Assumption to check: Limited advanced features in the free version
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the UI for faster navigation.
Assumption to check: User interface can be cluttered
Validate with people who use this workflow before building.
Hypothesis 4
Optimize server requests and app performance.
Assumption to check: Slow response during peak times
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
Use Speedtest® for a quick, easy, one-tap connection internet speed test—accurate anywhere thanks to our global server network. Explore mobile network coverage with Speedtest Maps based on real-world data gathered by the Speedtest app. See performance by provider to find out where you’re likely to experience strong connectivity. Easily switch between providers and regions to compare coverage in the locations you frequent. Video testing empowers you with a real-time assessment of your network’s current streaming quality. Take a video test to get actionable insights that help you optimize your online video experience. Millions of users have made Speedtest the #1 app for testing internet speed, and it’s trusted daily by professionals throughout the industry: - Discover your download, upload, and jitter - Measure ping at 3 stages: idle, download, and upload - View mobile carrier coverage with Speedtest Maps - Take a video test to measure your max resolution, load time, and buffering - Real-time graphs show connection consistency - Test with a single connection to simulate downloading a file or multiple connections to understand max speed - Troubleshoot or verify the speed you were promised - Track past tests with detailed reporting - Easily share your results Go ad free! If you’d like to enjoy Speedtest without ads, we provide the option of removing ads from Speedtest for $0.99. Privacy Policy: https://www.speedtest.net/about/privacy Terms of Use: https://www.speedtest.net/about/terms Do not sell my info: https://www.speedtest.net/about/ccpa
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
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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.
