App Overview

Memo Calc · FusionCalc2 Pro icon

Memo Calc · FusionCalc2 Pro

Leo Rivas-Micoud · Productivity

· Drag and drop a number to save it as a memo

$14.99 · In-app purchases

PRICE
$14.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
5.0
2 ratings · Top 5%

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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A product spec, screen plans, and build steps for your coding agent.

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What's included13 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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> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Memo Calc · FusionCalc2 Pro: 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

Enhance with scientific calculator features and graphing.

Assumption to check: Limited functionality for advanced calculations

Validate with people who use this workflow before building.

Hypothesis 2

Implement cloud sync and backup for memos.

Assumption to check: No cloud sync or backup options

Validate with people who use this workflow before building.

Hypothesis 3

Offer themes and layout customization options.

Assumption to check: Interface not customizable

Validate with people who use this workflow before building.

Hypothesis 4

Add options to export memos as PDFs or text files.

Assumption to check: Lack of export features for memos

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

· Drag and drop a number to save it as a memo. Then copy any number memo in your calculations. Looking for a fast, easy, basic calculator with memory? Want to easily create sheet style list to manage shopping list, expenses, calories, etc ? Meet FusionCalc2, the sticky notes memo calculator. Drag a number from the calculator to save it as a memo. Then, reuse it at any time in your future calculations. See why our handy calculator has been acclaimed as one of the fastest and most innovative calculator apps. Try the FusionCalc2 notes calculator app today (Free version also available)! ■ BASIC CALCULATOR Designed to save, drag, and reuse your numbers, our notes list calculator is perfect for busy professionals, pet parents, moms, and anyone who needs quick, efficient math! Here are the types of calculations you can do: · basic operations (addition, subtraction, multiplication, and division) · percentage · tax (you can edit the tax percentage at any time) OFFLINE & DARK-MODE CALCULATIONS Make use of the eye-friendly dark mode when you do calculations at night. Also, don’t worry about having internet access since you can use the FusionCalc2 calculator offline. ■ A HANDY, VERSATILE CALCULATOR
◉ Great for Work & Business – Perfect for finance, invoices, sales, taxes, and budgets. Can be used as a tax calculator app. ◉ For Moms & Parents – Grocery lists, school expenses, household budgets—made easy. ◉ For Pet Owners – Track pet care expenses, vet visits, pet food, and feeding schedules by using ◉ FusionCalc2 as your pet calculator. ◉ For Freelancers & Entrepreneurs: Track earnings, costs, and client invoices on the go.
◉ For Students & Teachers: Save equations and complex calculations for later reference. ◉ For anyone: stay organized – save calculations as sticky notes for later use. ■ FUSIONCALC2 APP FEATURES: • basic calculator • save numbers as memos for fast calculations • drag and drop number notes to use them in your calculations • edit the tax percentage • calc sound (can be turned off) • dark mode • works offline • Export list as CSV • ad-free version Why settle for an ordinary calculator when you can have one that works smarter and faster? With FusionCalc2 you get the function and simplicity, but you can also save, drag, and reuse numbers effortlessly and manage lists with automatic sum calculations. ► Try FusionCalc2 for iPhone & iPad TODAY! ___________ FusionCalc2 FAQ: ∆ How is FusionCalc2 different from other calculators with history save? FusionCalc2 is more than just a basic calculator offline app—it lets you save, drag, and reuse numbers instantly without needing to re-enter them. Perfect for multitaskers!
 ∆ What can I use the list feature for? You can use the list to calculate the sum of anything you want, such as calories, expenses, shopping lists, and so on. Use it for any calculation that requires lots of adding. It will save a lot of you time! ∆ Can I use FusionCalc2 for business calculations?
Yes! Our amount calculator is great for small business owners, freelancers, and accountants who need to track expenses, invoices, and budgets.
 ∆ Does FusionCalc2 work offline?
Yes! You can use all memory calculator features without an internet connection—great for travel, remote work, and on-the-go calculations.
 ∆ Is FusionCalc2 a free calculator? Yes! Download the free version to try it out for free. You can use all core features of our number note list calculator for free, with an optional upgrade for an ad-free experience.

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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.

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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.