App Overview

Digits Tape Calculator icon

Digits Tape Calculator

Shift · Utilities

Get organized! Conquer numbers on the go

$1.99 · In-app purchases

PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.8
1,120 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 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 Digits Tape Calculator: map the core Utilities 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 advanced features like scientific calculations or graphing.

Assumption to check: Limited functionality compared to advanced calculators.

Validate with people who use this workflow before building.

Hypothesis 2

Allow users to customize tape appearance and functionality.

Assumption to check: Lack of customization options for the tape history.

Validate with people who use this workflow before building.

Hypothesis 3

Implement support for order of operations and parentheses.

Assumption to check: No support for complex calculations with parentheses.

Validate with people who use this workflow before building.

Hypothesis 4

Redesign the UI to be more modern and visually appealing.

Assumption to check: Basic UI that may feel outdated.

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

Get organized! Conquer numbers on the go. Digits 3 is a top-to-bottom rewrite made for the latest iOS and devices. We're human. We're busy. We make mistakes. So we designed a calculator for humans, from the ground up. Digits combines the editability of a spreadsheet with the simplicity of a calculator. Digits is a calculator a human can love. So, why do so many humans love Digits? Its uniquely correctable tape means never worrying if you entered a calculation correctly. Make a mistake? Tap any entry on the tape to correct it (or edit, insert, copy and more). Then, add a label/comment and email or print the tape. Digits is Shift’s highly-rated iOS calculator app that features an intuitive, fully correctable and editable line-by-line tape history. It uniquely provides spreadsheet-like editing with calculator-level simplicity. Tapes are stored as documents so groups of calculations can be stored and edited conveniently. Comments can be added to each calculation line, making the app ideal for expense tracking and budgeting. --- Digits 3 highlights: • An updated, polished user interface with buttery-smooth interaction. • Dark Mode and detailed color and sound customization. • Multi-threaded processing for desktop-level performance. • In-app upgrades, starting with Tape Document sharing (via Messages, Mail, Dropbox and other popular file sharing services). • Built from the ground up with support for 64-bit and the latest iOS/hardware. • Designed to maximize resolution on devices like the iPhone X. • Split View support on iPad for side-by-side work. • Expanded in-app help. • Accessibility VoiceOver support. How Digits earned its stars: • Spreadsheet-like editing with calculator-level simplicity. • Fully correctable and editable line-by-line tape history. • Fluidly enter values, label and email or print. • Double-check and correct entries with ease. • Export Tape Documents in a variety of formats. Button functions: Delete row, backspace, clear all, clear, memory, memory plus, memory minus, plus or minus, tape browser, percent, export, settings, shop, tips, help, edit, insert, total, copy, use, comment, flag, sin, cos, tan, square, cube, exponent, square root, cube root, root, inverse, Euler, Pi, add, subtract, multiply, divide, total.

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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.