App Overview

Pool Chemical Dose Calculator icon

Pool Chemical Dose Calculator

Hasa Inc. · Productivity

Pool Chem Dose Calculator will calculate the exact chemical dose needed for 38 chemicals in 11 categories for any size pool in US Imperial or Metric measures

$5.99 · In-app purchases

PRICE
$5.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
2.9
13 ratings · Below Average

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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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/
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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.

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.

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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Rork plan preview for Pool Chemical Dose Calculator: 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

Expand chemical types and allow user-defined entries.

Assumption to check: Limited chemical options available

Validate with people who use this workflow before building.

Hypothesis 2

Incorporate advanced calculation options based on pool type.

Assumption to check: Calculations may not account for all factors

Validate with people who use this workflow before building.

Hypothesis 3

Improve UI with better design and user testing.

Assumption to check: User interface is not user-friendly

Validate with people who use this workflow before building.

Hypothesis 4

Clarify subscription benefits and offer clear trials.

Assumption to check: In-app purchases 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

Pool Chem Dose Calculator will calculate the exact chemical dose needed for 38 chemicals in 11 categories for any size pool in US Imperial or Metric measures. To use it you enter the pool volume in gallons or liters, choose US Imperial or Metric, select which item you want to change from the drop down list and then enter the desired change in ppm or mg/l. Pool Chem Dose Calculator then lists all of the chemicals that can be used for that item change and the doses for each one. It only shows 3 chemicals on the screen. If there are more than 3 for an item, you can scroll down the list. No brand names, no sales just the exact dose of the chemical you want to use by chemical name. Use it while you are at a pool or in the field to find out how much chemical to add to make a correction or increase or decrease a condition. Select from the following items: Increase Chlorine, 15 chemicals Increase Bromine 2 chemicals Increase Alkalinity 3 chemicals Decrease Alkalinity 2 chemicals Increase Hardness 2 chemicals Increase CYA 2 chemicals Increase Oxidizer 1 chemical Decrease Chlorine 6 chemicals Increase Salt 1 chemical Increase Borate 3 chemicals Increase Copper 1 chemical. For example, if you want to Increase Chlorine by 3 ppm in a 14,750 gallon pool, enter 14750, select US Imperial, select Increase Chlorine from the drop down menu and enter 3.0 in ppm. Instantly see the amounts needed to get 3.0 ppm chlorine in that pool for 15 types of chlorine. Makes it easy to compare and see which might be cheaper to use or make a substitution. You can also use the Pool Chem Dose Calculator to figure out the change to a water condition if you add an amount of chemical. For instance suppose you have a 15,000 gallon pool and you want to know how much the free chlorine will increase if you add a gallon of 10% liquid chlorine. No problem, just enter the pool volume, select US Imperial, select Increase Chlorine and then enter an amount for ppm. Keep changing the ppm up or down until the dose amount for Chlorine 10% gets near 128 fl oz or 4 qts. Saves money because you get the exact dose for that pool – no more guessing. Have an emergency where too much chlorine was added and now you need to neutralize the chlorine in the pool? No problem, Just enter the pool volume, US or Metric, select Decrease Chlorine and enter the amount of chlorine you want neutralized and you get the amounts needed for 6 chlorine neutralizers. You will find this app invaluable.

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Screenshots

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BUILD KIT DIFFICULTY
Starter

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.