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.
LSI Calc DB Water Balance Log is built for pool and spa professionals who need fast, repeatable water chemistry checks without jumping between paper logs, spreadsheets, and separate calculator tools.
$0.99 · In-app purchases
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.
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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.
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 LSI Calc DB Water Balance Log: map the core Business 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 features for complex water quality calculations
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: User interface may seem outdated
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of data persistence
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No educational resources on water quality
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.
LSI Calc DB Water Balance Log is built for pool and spa professionals who need fast, repeatable water chemistry checks without jumping between paper logs, spreadsheets, and separate calculator tools. Use the app to calculate Langelier Saturation Index (LSI), save readings by site, monitor chemistry trends over time, and export clean records when clients or supervisors ask for proof of service. Everything is organized for real route work: quick data entry, easy edits, and clear readouts. Why teams use LSI Calc DB: - Built around LSI workflow, not generic note taking. - Designed for recurring site visits and repeat measurements. - Fast enough for field use, structured enough for reporting. - Works for both quick checks and long-term record history. Core calculator and record features: - Calculate LSI from TDS, water temperature, calcium hardness, total alkalinity, and measured pH. - Switch between Fahrenheit and Celsius inputs. - Get instant LSI category feedback from scale-forming to corrosive ranges. - Save measurements as records tied to a site name. - Keep record notes for service details, observations, or treatment context. - Update existing records after retesting water on-site. - Duplicate prior records to speed up repeated service calls. - Search records by site, date, and notes. - Sort record history by date to review newest or oldest trends quickly. Site management and operational flow: - Create reusable site profiles in Add Site. - Store simple notes per site for technician context. - Select saved sites during data entry to reduce typing. - Use draft behavior to start a new measurement, then complete and save when ready. - Keep list and detail visible side-by-side on iPad for faster editing. Stats and trend review: - Open per-site statistics in one tap. - See minimum recorded values for key chemistry metrics. - See maximum recorded values to catch risk spikes. - See average values across saved records for baseline tracking. - Review LSI movement over time for each property. Spreadsheet and data handling: - Browse records in a spreadsheet-style grid for high-volume review. - Sort by column to inspect specific metrics quickly. - Load data in batches for responsive performance. - View up to 250 recent records in spreadsheet mode. Export, sharing, and backup: - Export record data as CSV for spreadsheet or reporting workflows. - Export records as JSON for structured data transfer. - Export full database JSON as a backup snapshot. - Import database JSON to restore or merge saved data. - Share exports directly to Files, Mail, Notes, and other iOS share targets. Quick Calc mode for immediate checks: - Use a separate local Quick Calc tab for fast device-side calculations. - Keep quick-check values and last result in local storage. - Share quick calculation output when needed. Practical use cases: - Daily pool service logs. - Spa startup and balancing checks. - Follow-up verification after chemical adjustments. - Side-by-side before/after chemistry comparisons. - Documentation for service reports and internal QA. Built for iPhone and iPad field work: - Fast tap targets and plain-language labels designed for techs in motion. - iPad split layout helps teams compare record lists and details without constant back navigation. - Integrated share flows reduce manual copy/paste when sending service documentation. - Local-first storage keeps your workflow available where connectivity is inconsistent. - Practical defaults help new entries start quickly, even on busy multi-stop routes. If your work depends on consistent pool water chemistry records, LSI Calc DB gives you a straightforward way to calculate, log, review, and export LSI data in one place.
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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.