# i know percent — Percentage Calculator

> Intuitive percentage calculator with crypto tracking and currency conversion. (iPhone/iPad app by Dmitry Mashkin.)

- Source: https://appshunter.io/ios/app/i-know-percent/id1370838641 (this page in markdown: same URL + `.md`)
- Developer: [Dmitry Mashkin](https://appshunter.io/developer/1164457417)
- Category: Finance, Business
- Price: $0.79 with in-app purchases
- Rating: 4.80/5 from 20 App Store ratings · 16 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 1 MB
- Languages: American English
- Released: 2018-04-22
- Data updated: 2026-08-23
- Monetization: subscription
- User reviews in markdown: https://appshunter.io/ios/app/i-know-percent/id1370838641/reviews.md

## What is i know percent?

Meet i know percent – your sleek, intuitive assistant in the world of percentages, working in real-time. Our streamlined interface makes solving percentage calculations quick and easy.

With i know percent, you have six essential tools at your fingertips:

- Calculate percentage increase or decrease from X to Y.
- Find what X% of Y is.
- Add X% to Y.
- Subtract X% from Y.
- Determine what percentage X is of Y.
- Track cryptocurrency values.

But there’s more! We’ve added a simple, yet powerful, currency converter to enhance your calculation toolkit.

Whether you need to calculate a percentage of a number, figure out a tip, add or subtract percentages – i know percent has you covered.

Percentages are everywhere in daily life. Stay one step ahead with i know percent.

Subscription Pricing:

- 1-Month Subscription: Just $0.99
- Payment will be charged to your iTunes account upon confirmation of purchase.
- Subscriptions automatically renew unless auto-renew is turned off at least 24 hours before the end of the current period.
- Your account will be charged for renewal within 24 hours before the end of the current period, with the renewal cost identified.
- Manage or disable auto-renew in your Apple ID account settings anytime after purchase.
- This price applies to United States customers; pricing in other countries may vary and actual charges may be converted to your local currency based on your country of residence.

Privacy Policy: 
https://artcoastdesign.com/privacy/

Terms of Service: 
ttps://artcoastdesign.com/terms/

## Key features

- Real-time percentage calculations
- Percentage increase/decrease
- Calculate percentage of a number
- Add/subtract percentages
- Cryptocurrency value tracking
- Currency converter

## Pricing and in-app purchases

Base price: $0.79.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| 1 Month Crypto Tracker Premium | $0.39 | per month |


## Chart rankings

- #71 in Top Paid · Finance (US App Store)

## Recent user reviews (10 of 16)

All indexed reviews: https://appshunter.io/ios/app/i-know-percent/id1370838641/reviews.md

### 5/5 — Great app

*2025-11-08, version 3.1.95*

Flexible ratios

### 1/5 — Disappointed

*2023-02-19*

I had hoped this app would work as it would be really helpful for my property purchase. I wanted to know a percentage value. I entered the figures but there was nothing to press for the calculation. I even deleted the app and reinstalled it.  Still didnt work.

**Developer response:** Hello, the application works stably on all available devices. Would you help us if you wrote the model of your phone

### 5/5 — пацаны

*2022-10-29*

воообщее

### 5/5 — 希望增加支持简体中文版

*2022-10-17*

五星好评，希望在下个版本中增加简体中文的支持，谢谢

**Developer response:** 😌❤️

### 5/5 — Супер

*2022-08-30*

Ничего лишнего

**Developer response:** Спасибо!

### 1/5 — Doesn't Work

*2022-08-07, version 3.0*

👎App doesn't Work

### 1/5 — Beware!

*2022-07-21, version 3.0*

UPDATE: as you can see by the developer response, he’s not happy he got called out!

Regardless of his assertions that the app does not collect data, the fact is the privacy statement very clearly states your data is collected. Read it if you don’t believe me. This means that legally, even if the developer says the app doesn’t, it probably does, or may do at some random point in time. Otherwise, why state it in there?

I repeat: beware this app and this developer

Original review: Russia-based developer. Also states data is not collected but privacy policy very clearly states it does.

### 5/5 — Fine thing, but missing some points…

*2022-05-05*

Add another function like “X is how many % of Y”…  you have one function just opposite of this… but this is missing… add this one on next update….

Thanks for adding the asking….  :-)

**Developer response:** Let's try to do it :)

### 4/5 — 求增加中文

*2022-04-17*

求增加中文

**Developer response:** Ok

### 5/5 — 3.0

*2022-04-16*

希望汉化下，升级3.0后没有以前的好友，希望增加个选择保留老版本

**Developer response:** language support will come later

## Frequently asked questions about i know percent

### What is i know percent?

i know percent is a finance app designed for quick and intuitive percentage calculations. It offers tools for finding percentages, calculating increases or decreases, and even tracking cryptocurrency values, all within a streamlined interface.

### What types of percentage calculations can I perform with i know percent?

You can calculate percentage increase or decrease from one value to another, find what a specific percentage of a number is, add percentages to a value, subtract percentages from a value, and determine what percentage one number is of another.

### Does i know percent support cryptocurrency tracking?

Yes, i know percent includes a feature to track cryptocurrency values, enhancing its utility for users interested in digital assets alongside traditional financial calculations.

### What is the subscription cost for i know percent?

A 1-month subscription to i know percent costs $0.99. Pricing may vary in other countries, and actual charges will be converted to your local currency.

### How do I manage my i know percent subscription?

You can manage or disable auto-renew for your subscription within your Apple ID account settings anytime after purchase. The subscription automatically renews unless turned off at least 24 hours before the current period ends.

### Is i know percent available on Android?

Based on the provided data, i know percent is supported on iPhone, iPad, and iPod. Information regarding Android availability is not included.

### How often is i know percent updated?

The app was last updated on October 29, 2024, indicating active development and support. The current version is 3.1.95.

### What is the age rating for i know percent?

i know percent has an age rating of 4+, making it suitable for a wide range of users, including younger individuals who may be learning about percentages.

## Version history (last 5 releases)

### 3.1.95 — 2024-10-29

- Bug Fixes and Performance Improvements

### 3.1.90 — 2024-10-27

- Bug Fixes and Performance Improvements

### 3.1.71 — 2024-02-12

- Bug Fixes and Performance Improvements

### 3.1.70 — 2023-09-21

Added support for iPhone 15
Subscription price has been reduced

### 3.1.50 — 2023-09-09

Resolved an issue where certain calculator screens wouldn't appear after closing the welcome pages.

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## More apps by Dmitry Mashkin

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- [Vostok — Story Maker](https://appshunter.io/ios/app/vostok-story-maker/id1453318714)
- [Tipio – Quick Tip Calculator](https://appshunter.io/ios/app/tipio-quick-tip-calculator/id1476927056)

All apps by Dmitry Mashkin: https://appshunter.io/developer/1164457417

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-23.*