App Overview

10bii Financial Calculator icon

10bii Financial Calculator

K2 Cashflow, Inc. · Finance

Look no further, you have found the best Financial Calculator app available

$5.99 · In-app purchases

PRICE
$5.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.7
661 ratings · Top 15%

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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Combine features and design from your favorite apps.

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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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Free quick prompt For a smaller starting point

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 10bii Financial 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 more diverse financial calculations.

Assumption to check: Limited calculation types compared to competitors

Validate with people who use this workflow before building.

Hypothesis 2

Modernize design with a more user-friendly interface.

Assumption to check: User interface can feel outdated

Validate with people who use this workflow before building.

Hypothesis 3

Implement features for saving and exporting results.

Assumption to check: No ability to save or export calculations

Validate with people who use this workflow before building.

Hypothesis 4

Introduce a more user-friendly subscription model.

Assumption to check: In-app purchase prompts can be aggressive

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

Look no further, you have found the best Financial Calculator app available. In-App Purchase: 10bii+ Features (Bonds, Breakeven, Depreciation, Trig, Probabilities) available! 5 Stars: "What is the PV of WOW? I'm sure thrilled with everything about this app! Too bad there isn't room for another star!" - Pokey 5 Stars: "This tool is excellent. It's downright marvelous! I would recommend it to any financial advisor without reservation." -John L Olsen, CLU, ChFC, AEP 5 Stars: "Awesome Financial Calculator! I use it all the time and love it!" - Tinahart2 5 Stars: "Great customer service along with the app's ease of use made this purchase a no brainer." - HarborDan 5 Stars: "I am a full-time investor in real estate and notes. This has become my "go to" app on my iPad. [It does a] wonderful job in integrating visual tools to illustrate financial cash flows. A++++" - Sanjosee Highlights: - Displays current N, I/YR, PV, PMT and FV values right above buttons - Print or Save PDF Amortization Schedules - Easily enter your Uneven Cashflows in a spreadsheet-like worksheet - Video Tutorials in Help section - Draws Cashflow Diagrams for simple TVM or complex Uneven Cashflows - Saves Recent calculations so you can easily reload them - Easy Mode allows everyone to get the financial answers you need! Finally a Financial Calculator for everyone! Whether you are a seasoned investor or you just have questions about paying off your credit card, refinancing your home, or planning your 401(k) contributions, the 10bii Financial Calculator has the answers to YOUR financial questions! The 10bii Financial Calculator is a versatile and powerful financial calculator which features more than 105 different functions for financial analysis, business, statistics, and general mathematics. Modeled after the extremely popular HP 10bII Financial Calculator, the 10bii Financial Calculator app combines precise mathematics, intuitive display, and ease-of-use in one compact package. It allows you to easily calculate loan payments, interest rates, amortization, time value of money, investment value, and more using a combination of powerful and intuitive equation-writing functionality and helpful worksheets. The 10bii Financial Calculator's keypad has been specially designed to be easy to use and easy to see. By expanding on HP's traditional presentation, the 10bii Financial Calculator allows quick and intuitive building and visualization of TVM (Time Value of Money) calculations and Uneven Cash Flows, lets you see the stored values of all of your memory registers in one easy view, graphs your statistical series, and lets you type in whole equations for easy review and one-touch evaluation. With the 10bii Financial Calculator, you can: Get answers to common financial questions WITHOUT having to know how to use a financial calculator! With the 10bii Financial Calculator's Easy Modes, answer a few simple questions worded in plain language (rather than Financial-ese) and find out just how much you'll save with that refi, how much you'll have at retirement, how long it'll take you to save up for that big purchase and more. Now with 12 Easy Modes! Easily enter and see diagrams for Cash Flows, including rapid calculation of Net Present Value and Internal Rate of Return. A dedicated interface makes adding, editing, deleting, and reordering uneven cash flows a breeze. Enter and analyze statistical data points, and see graphs based upon the values you enter. Includes standard calculations such as standard deviation, mean, and linear regression forecasting. Never has using a financial calculator been so easy or intuitive. The 10bii Financial Calculator is powerful enough for the professional but accessible enough for everyone. It is an ideal tool for teaching the power of compounding interest, analyzing potential deals or business ventures, or just doing math problems, and sharing the results of your work with others.

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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
Axios
React Navigation
React Native Reanimated
Zustand
BUILD KIT DIFFICULTY
Intermediate

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.