App Overview

CalcTape Paper Tape Calculator icon

CalcTape Paper Tape Calculator

schoettler Software GmbH · Finance

Calculator thought from scratch! Calculate, comment and correct instantly.

$2.99 · In-app purchases

PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.2
117 ratings · Top 30%

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.

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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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Quick prompt

> SELECT BUILD PLATFORM:

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

// RORK SYSTEM PROMPT
Rork plan preview for CalcTape Paper Tape Calculator: map the core Finance 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

Add support for scientific calculations and graphing.

Assumption to check: Limited functionality for advanced calculations

Validate with people who use this workflow before building.

Hypothesis 2

Introduce themes and customizable colors for buttons.

Assumption to check: Lack of visual themes or customization options

Validate with people who use this workflow before building.

Hypothesis 3

Allow exporting to other formats like CSV or Excel.

Assumption to check: No export functionality beyond PDF

Validate with people who use this workflow before building.

Hypothesis 4

Implement voice commands and screen reader support.

Assumption to check: Limited accessibility features

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

Calculator thought from scratch! Calculate, comment and correct instantly. What happens if you combine a standard calculator App, a classic desktop calculator and a note App ? CalcTape brings you the best of these and even more. It is your companion for all daily calculation needs and easily masters all scenarios you can imagine. CalcTape is NOT a scientific calculator app, but do we need these in daily use ? Ever did a long calculation with many figures and asked yourself: "Did I enter the last figure correctly ?" "The result looks strange somehow !" With CalcTape you keep an overview, can check all figures and correct figures instantly inplace with all subsequent results being adjusted automatically ! Missed a figure ? No problem: Just insert it in the right place easily by entering a new line. You can place the cursor everywhere you like in the calculation: It's like a note where you can change anything you like in any place with the advantage, that changing numbers or operators updates your calculation immediately! CalcTape can be considered an "Excel Lite with a calculator interface". You can also keep the calculation for your records (documents) and create templates: Replacing the figures in your template and getting the correct results is a breeze. Commenting figures and results gives sense to your calculations, so you can understand what you did when viewing the calculation a month later. Customize CalcTape to your needs and place only those buttons on your keypad that you really need everyday. Create your own functions to e.g. add a specific percent rate with a tap on a single button. CalcTape features: - Save your calculations into files - Create own functions or text snippets to be entered when pressing a button (long press a button to enter the Button screen) - Create own keypad layouts (change assignment of all buttons except numbers and backspace / change button sizes) - Select between different keypad layouts (the "function keypad" contains no numbers and is nearly completely customizable) to get more buttons or other functions, 2 keypads are directly accessible in the main screen - Share your calculations using standard iOS sharing capabilities, e.g. email - Sync your calculations with iPhone, iPad, Mac and PC using iCloud Drive. - Calculate TAX, VAT and other percent values easily - Use CalcTape for budget, accounting and expense tracking in the office and at home, everyday. CalcTape, more than a calculator. FAQ: - Start a new calculation on the same sheet by simply tapping the "=" key twice. - Do a long tap on a button to assign another existing function or to create a user function for it. - If you accidentally hit "AC" you can use "Undo" to get your calculation back.

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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.

SUGGESTED BUILD STACK
React Native
Expo
Redux
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react-native-gesture-handler
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.