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
Hapi – API Health Checks
Hapi is a simple, privacy-first mobile app for checking the health of your APIs directly from your device.
Free
PRICE
Free
No in-app purchases
BUSINESS MODEL
Free
No overall Grossing estimate available
RATING
N/A
No ratings yet
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.
First kit free with a verified email
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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.
What's included
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 Hapi – API Health Checks: 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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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
Include more customizable checks and alert types.
Assumption to check: Limited API monitoring options
Validate with people who use this workflow before building.
Hypothesis 2
Implement user accounts for saving settings and checks.
Assumption to check: Lack of user authentication
Validate with people who use this workflow before building.
Hypothesis 3
Add options to share check results with team members.
Assumption to check: No sharing functionality for results
Validate with people who use this workflow before building.
Hypothesis 4
Provide detailed performance metrics and historical data.
Assumption to check: Sparse analytics on API performance
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
Hapi is a simple, privacy-first mobile app for checking the health of your APIs directly from your device. Add your API endpoints, run quick health checks, and view response status and history without accounts, servers, or complicated setup. Everything runs locally on your phone. Hapi is designed as a lightweight companion for developers who want a fast way to check API health on the go, not a full uptime monitoring platform. What Hapi does: • Perform manual health checks against your API endpoints • View HTTP status codes and response timing • Store endpoint history locally on your device • Quickly refresh and review endpoint status • Home screen widgets for fast access (coming soon) Privacy first, by design: • No accounts or sign-ups • No proprietary backend servers • All endpoint data is stored locally on your device • Anonymous, minimal analytics and crash reporting only Your APIs stay yours. Pricing: • Hapi is free to get started. Upgrade to Hapi Unlimited with a one-time purchase to unlock: • Unlimited endpoints • Unlimited local history • Future features as they roll out No subscriptions. No recurring fees. Important notes: • Hapi does not provide uptime guarantees or alerts • Checks are run manually or on-device only • Endpoint availability depends on external systems Hapi is best used as a quick API health check tool, not mission-critical monitoring. Built for developers: Hapi is built by an indie developer who uses it daily, with a focus on speed, simplicity, and respecting your data. Have feedback or feature ideas? You’re always welcome to get in touch.
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
Supabase
Axios
Zustand
React Navigation
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
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.
