May 29, 2026

Smart Level (v1.3) 수평계 사용설명서

안녕하세요. 본 수평계앱가 많은 한국인에게 사랑받고 있기에 한국어 설명서를 따로 작성합니다.

수평계은 기본적인 도구이지만, 오랫동안 출시를 고려하지 않았습니다. 이미 기능이 유시한 각도기앱을 출시했기 때문입니다. 5년이 지나서야 액자의 수평을 맞출때 [수평계]를 검색해서 다운받지, 절대로 [각도기]를 검색하진 않는다는 충고를 들었고, 급히 출시했습니다. 괜한 고집때문에... T..T


※ 소개영상




※ 주요기능
 1) 평면
 2) 세로방향
 3) 가로방향
 4) 영점보정

 5) 보정값 리셋
 6) 알람음 켜고 끄기


기울기 단위
 ① 도(˚)
 ② 퍼센트(%)
 ③ 라디안(rad)
 ④ 지붕 경사 : 1/12"


※ 메뉴 및 설정
 - 글자크기, 글자색깔, 배경색상, 영점보정 버튼보이기
 - 기울기단위, 방위센서, 이용약관


※ 화면의 구슬을 고정하려면
측정중 화면 아무곳이나 터치해서 가만있으면 "Holding..." 메시지가 깜박이면서 고정됩니다.


※ 알람 아이콘을 상단에 보이기
설정에서 [알람]옵션을 켜세요. 메인화면 상단에 스피커 아이콘이 나타납니다. 이것으로 소리를 켜거나 끌수 있습니다.


※ 방위센서가 왜 필요한가 ??
대부분의 수평계앱은 가속도센서만 사용합니다. 그런데 이 센서에는 한계가 있답니다. 경사가 60도 보다 크면 측정값이 매우 부정확해 집니다. 즉, 수평을 맞추는데는 좋지만 경사로 같은 기울기 측정에는 불리합니다.

이 앱에서는 방위센서를 이용하는 방식으로 해결책을 찾았습니다. 나침반센서를 추가하는 방식으로 경사로 측정값이 매우 정확해 집니다. 이 옵션을 켜 놓기를 추천합니다. 나침반센서가 없거나 구슬이 부드럽게 움직이지 않는 경우에는 이 옵션을 꺼 주세요.


※ 자주하는 질문
Q. 수평계가 움직이지 않아요.
A. 일부 센서에 문제가 있습니다. 먼저 설정에서 [방위센서]를 꺼 보세요.

Q. 영점보정으로 초기화할 수 없습니다.
A. 보정을 여러번하면 보정이 안될수 있습니다. 상단에서 리셋버튼(둥근화살표)를 클릭해 보세요. 그래도 안되는 경우라면, 메뉴에서 [설정초기화]를 하면 앱의 최초상태로 돌아갑니다.


 프로 버전에 추가된 기능
 1) 6개의 도구 (눈금자, 3개의 각도기, 쓰레트측정기)가 통합
 2) 광고없음
 Get it on Google Play


※ 새로운 기능
 - v1.3.0 : Support for OS 16
 - v1.0 : 수평계 (Smart Level) 출시 (2015년 7월)
https://play.google.com/store/apps/details?id=kr.sira.level

앱을 사용하면서 아이디어가 있으면 언제든지 이메일을 보내주세요. androidboy1@gmail.com 
감사합니다.

September 5, 2025

Battery Meter (v1.0)

 Hello. I'm android boy, the chief developer of Smart Tools co.,


Recently, there has been a growing interest in batteries. Do you want to check the condition of your smartphone battery in real time?

The latest smartphones have a settings menu that displays various battery information. However, this isn't enough, and some devices only provide brief information. I thought I could do better, so I released this app. :)


※ Introduction video



※ Battery information
- Level, Status, Remaining time
- Voltage, Ampere, Temperature
- Health, Capacity, Power
- Type, Model, Version


※ Pending update
- Battery usage per app
- Daily charts
- Styles in various colors


※ What's new
 - v1.0 : Released (Sep, 2025)
https://play.google.com/store/apps/details?id=kr.sira.battery

If you have any idea to improve the app, feel free to contact me at androidboy1@gmail.com. Thank you.

March 27, 2025

Smart Measure (v1.8) manual

Hello. I'm Android boy, the chief developer of Smart Tools co,.

Do you know the height of the Statue of Liberty or Tour Eiffel? How do you know them? Maybe by Googling? Now I'll introduce a new rangefinder app.

Though this photos are manipulated, the app can measure them.


※ Introduction video



※ Theory of trigonometry
I had heard that some math teachers taught this theory to elementary school students.



※ Checklist Diagram
① Stand up!! Don't sit or lie down.

② Firstly, input phone's height and building height.
   Phone's height ≒ your height - 0.3m (1ft), default = 1.5m (4.9ft)
   It means the length from ground to camera lens.

③ Calibrate your device. You can make it accurate (~95% accuracy).
④ The result is not perfect, just for reference.
(click to enlarge)
< Russian >
< Spanish >
< Japanese >


 Manual Calibration
There are 10,000+ android devices in the world. They would show different measurements because of various sensor parts. Therefore, I strongly recommend to calibrate your device with known distance.
If the result is longer than actual distance, reduce by 5% at manual calibration. If shorter, increase by 5%.


 Calibrate Menu
The app supports auto-calibration menu, too.
After placing the back side of your device against the wall completely, click [Calibrate] button. Do it several times. The menu will find your best calibration.


 Menu
① Menu
② Manual calibration
③ Height input : it will hide into sub menu.
④ Screen capture


 Bubble level
The app has a green bubble level for accurate measurement. You can run zero-calibration by longclick. If your device is a tablet and the bubble is at the right edge, sensor settings is wrong. Please let me know model number.


 FAQ
Q. It would not work.
A. Does your device have a magnetic sensor (magnetometer) ?

Q. The result is not correct.
A. Please calibrate your device carefully and enter your height (from ground to device).

A. The distance is always "MAX".
Q. Your phone is aiming above the horizon. Please see checklist diagram.

Q. How long can it measure? Effective distance?
A. Normally 1-40m. When you are on a structure, you can measure more.

Q. I want to enter 4 ft 5 in as phone's height.
A. The app supports only decimal. Enter 4.4 ft.

Q. Please add "cm" or "inch" units.
A. The result is not perfect, at least 3-5% off. Smaller units are not efficient.

Q. The height button does not appear.
A. After measuring the distance of a target, the app activates height function.


 Pro version added features
 1) Measurement of the Width and the Area
 2) Camera Zoom
 3) Portrait mode
 4) No ads
 Get it on Google Play


 User's gallery
- For hunting with archery bow



 What's new
 - v1.8.0 : Support for OS 15
 - v1.7.0 : Support for Android OS 10
 - v1.6.8 : OS 4.0+
 - v1.6.0 : Material design
 - v1.6 : Screen capture
 - v1.5 : Action Bar
 - v1.4 : 10+ languages support
 - v1.3 : New icon, tablets support
 - v1.2 : App2SD
 - v1.0 : Smart Measure released (Nov, 2010)
https://play.google.com/store/apps/details?id=kr.sira.measure

If you have any idea to improve the app, feel free to contact me at androidboy1@gmail.com. Thank you.

-----------------------------------------------
The ideas to measure the distance had an International Patents. (Jul, 2010)
Copyright ⓒ 2010-2025 Smart Tools co., All Rights Reserved.
-----------------------------------------------

September 11, 2024

Unit Converter (v1.7) manual

Hello. I'm Android boy, the lead programmer at Smart Tools co.,

There are countless unit conversion apps on the Google Play Store. However, most of them have poor and complicated user interfaces. Over the past 15 years, I’ve been refining my unit conversion app to make it intuitive and easy to use.

This app cannot include every unit in the world. It displays only common units selected based on user feedback. The list of units displayed varies depending on your country and system language.

※ Introduction video
※ List of units
※ How to use
※ Menu & Settings
※ Custom list of currencies
※ Data storage / flow ?
※ Some units were not found while traveling abroad.
※ What is the Ad-free menu ?
FAQ
※ Pro version additional features
※ What's new


※ Introduction video



※ List of units
 ① Basic : length (distance), area, weight (mass), volume (capacity)
 ② Living : exchange rates, temperature, time, speed, shoes, clothing, hat, ring
 ③ Science : pressure, force, work (energy), power, torque, flow, current, voltage, density, viscosity, concentration, magnetic flux density, astronomy
 ④ Misc. : cooking, data, fuel efficiency, angle, illuminance, radiation, prefixes, binary (ASCII), time zones, blood sugar, AWG, hardness, numbers


How to use
 1) Select a category (Basic / Living / Science / Misc.)
 2) Select one of the 4 tabs
 3) Select a unit by LONG-CLICK on the list or click the selector
 4) Tap the number input field, then use the keypad to enter a number.


※ Favorites.
You can select up to 4 favorites from the Living, Science and Misc. categories.
Check the checkboxes in your preferred order (①-②-③-④).


※ How to add [Torque] units.


  ① go to the Science category
  ② click the favorites icon on the app bar
  ③ uncheck one of your current 4 favorites

  ④ check [Torque] as your favorite
  ⑤ return to the home screen
  ⑥ tap the [Torque] tab


※ Currency (exchange rates).
 - 120+ currencies, Bitcoin, XAU
 - [My currency] is automatically set based on your mobile carrier and system language.
 - You can select a region from the list in the app bar: All / Majors / Europe / ...

 - Click the refresh icon to receive the latest exchange rates from the servers.
 - Exchange rates are based on Bank of canada, Fx-exchange, FxexchangeRate, etc.
 - There may be a delay of 1 to 12 hours. Exchange rates are provided for reference only.


※ Menu & Settings
① Country selection
② Language selection
③ Sound effect on/off

④ My Currency
⑤ Region : Majors, All, Custom, Europe, America, Asia, ...

⑥ Decimal format
⑦ Keypad layout
⑧ Vibration : turn keypad vibration on/off
⑨ Sleep : screen auto-off


※ Custom list of currencies
  ① Select "Custom" from the list at the top,
  ② Click the (+) button in the bottom right corner.
  ③ Check the currencies in the order you want.
 - You can select up to 10 currencies.
 - If nothing is selected, only your currency will be displayed.


※ How to move units.
 - You can move units in the "Basic" category.
 - Click the [More (3 dots)] and [Edit] menu to display the move icons for each row.
 - Select a unit that you want to move, and LONG-CLICK its move icon.
 - Drag the floating unit to the desired position and drop it.
 - To finish, click the [Back] key or re-select [Edit] menu.
 - Changing the country selection in Settings will reset the repositioned units.


※ How to enter fractions.
When entering length and weight, there is a [. /] button on the keypad. You can use it to enter fractions.

ex1) 5 1/4 =>  [5] + [./] + [1] + [./] + [4]
ex2) 3/8 = 0 3/8 => [./] + [3] + [./] + [8]   (Look out!! 3/8 is less than 1.)
       or [3] + [./] [./] + [8]


※ How to enter "ft and inch" at the same time
Select the "ft in" unit. You can use fractions when entering various values. The same applies to "lb oz".

ex1) 2' 3.5" =>  [2] + [ ' "./ ] + [3] + [ ' "./ ] + [5]
ex2) 1' 2 5/8" => [1] + [ ' "./ ] + [2] + [ ' "./ ] + [5] + [ ' "./ ] + [8]


※ How to enter "deg min sec"
Select the "deg min sec" or "deg" unit in Angle tab. You can enter "deg min sec" using the [.˚ '] button on the keypad.

ex1) 1˚ 23' 45.67" =>  [1] + [.˚'] + [2][3] + [.˚'] + [4][5] + [.˚'] + [6][7]
ex2) 0˚ 1' 2" =>  [.˚'] + [1] + [.˚'] + [2]


※ How to enter "hh:mm:ss"
Select "hh:mm:ss" or "hour" unit in Time sec. You can enter "hh:mm:ss" with [. :] button on the keypad.

ex1) 1:23:45 =>  [1] + [. :] + [2][3] + [. :] + [4][5]
ex2) 0:00:02 =>  [. :] + [. :] + [2]


※ Data storage / flow ?
To save a tab, this app displays both "data storage" and "data flow" on the "Data" tab. It is not an error. By the way, do you know the difference between "kb", "kB", "kib", "kiB", "kbps"?

 b : bit
 B : byte
 k : kilo (1000)
 Ki : kibi (1024)
 M : mega (1000 x 1000)
 Mi : mebi  (1024 x 1024)
 kbps : kilo bit per second


※ Some units were not found while traveling abroad.
This app displays different units depending on the user's country. It can guess the user's country based on the mobile carrier and system language.

When traveling abroad, a different set of units may be displayed due to international roaming. In this case, please select the appropriate country in the [Country selection] option in Settings.


※ What is the Ad-free menu ?
Watch a 30-second reward video to remove all ads for 9 hours. In other words, you’ll get the same experience as the paid version.


※ FAQ.
Q. How do I copy the result to the clipboard?
A. Tap the result twice (Double-tap).

Q. How do I convert grams to liters?
A. "gram" is a weight unit, "liter" is a volume unit. These cannot be converted into each other. 1L of water = 1kg, 1L of gasoline = approx. 0.70kg

Q. Where can I find the "A (amp)" unit?
A. Click the favorites icon in the Science category. Check the [Current] checkbox.

Q. "kg" is a unit of mass, not weight.
A. I know that. weight = mass x gravity. On earth, "mass" and "weight" are the same.
Above all, "weight" is a familiar term, and the public does not fully understand "mass".

Q. I need more units such as kHz, MHz, GHz ...
A. Why not try using the "Prefix"?

Q. How do I mute video ads?
A. Turn off [sound effect] option at the settings.


※ Pro version additional features:
 1) No ads
 2) The bottom box for useful information (unit names, formulas, ...)
 3) More options at the settings (accuracy, layout, decimal places)
 Get it on Google Play


※ Update pending
- more style with various colors (Done !)
- move units up/down (Done !) and remove
- custom unit adding


※ What's new
 - v1.7.10 : Android 16 support
 - v1.0 : Released (Nov, 2013)
https://play.google.com/store/apps/details?id=kr.sira.unit

If you have any suggestions for improvements, please feel free to contact us at androidboy1@gmail.com  Thank you.

August 27, 2024

Qibla Compass (v1.0) manual

Hello. I'm android boy, the chief developer of Smart Tools co.,

Many "Smart Compass" users have requested the Qibla function. Recently, while updating the direction function in the Pro version, we decided to release a individual Qibla app for Muslims. If you are a "Smart Compass" user, you can use this app very easily.


※ Introduction video


※ What's new
 - v1.0 : Released (Sep, 2024)
https://play.google.com/store/apps/details?id=kr.sira.qibla


The Arabic translation is somewhat poor. If you can help, please email me at androidboy1@gmail.com. Thank you.

December 1, 2023

Smart Calculator (v1.1) manual

Hello. I'm Android Boy, the chief developer of Smart Tools co.,

The pre-loaded calculator app on Galaxy phones is so great that I did not need to create our own. However, some phones, such as Motorola and Infinix, do not have a pre-loaded calculator, and I'm well aware of the limitations of the Galaxy calculator.

We adopted the same design as our existing unit converter. It makes this app intuitive and simple with a familiar interface. 

First, we launched this app with two calculator types (Basic, Scientific). Two more tabs are in progress. (money, misc.)


※ Introduction video




※ Calculators
 ① Basic
 ② Scientific



※ How to use
There's no special usage instructions. Enter a number and an operator, then click the equal (=) button.

To view your usage history, click the history icon (clock) in the center left.
Seven colors are available. Click the More menu (three dots) in the upper right corner. Style(brown, black, gray, blue, green, red and purple)


※ What's new

 - v1.1 : Support for OS 15, App opening ad
 - v1.0 : Released (Dec, 2023)
https://play.google.com/store/apps/details?id=kr.sira.calculator

If you have any idea to improve the app, feel free to contact me at androidboy1@gmail.com. Thank you.

September 7, 2023

Privacy Policy (EU)

Privacy Policy for websites


Smart Tools corporation("We", "Our", "Us") has developed this Privacy Policy to help you understand how we collect, use and protect the information. We encourage you to read this Privacy Policy carefully so that you can make informed decisions about your use of our websites("the webs").

By visiting the webs, you agree to this privacy policy and give an explicit and informed consent to the processing. If you do not agree, please leave the webs.

1. Non-personal Data
Non-personal data means information that, by itself, does not personally identify you. We may collect Non-personal data such as your IP address and other properties for purposes of analyzing the webs.

2. Ad serving Technology
We may disclose Non-personal data to third parties and/or allow third parties to collect Non-personal data through their own embedded technology. In order to deliver ads to you, the third-party advertising companies may place or recognize unique cookies, anonymous identifiers or similar technology for non-personally identifiable information. If you would like more information, please follow the link below:
AdSence - http://policies.google.com/privacy

3. Personal Data
Personal data means personally identifiable information that specifically identifies you as an individual (e.g. your name, email address). We collect and store Personal data only with your consent. 

4. Third party terms and conditions
Please note that your access to the webs may be subject to certain third-party terms and conditions and privacy policies. You recognize and agree that we is not liable for any such third-party terms and conditions and any third party’s use of your Personal data. Here are links to the privacy policies of a few of the distributors we use:
Google - http://www.google.com/intl/en/policies/privacy/

5. Disclosure and Transfer of Personal Data
We disclose information to respond to subpoenas, court orders and other legal processes as well as to establish/exercise our legal rights or defend against legal claims. We will share Personal data and Non-personal data in order to investigate, prevent or take action against illegal activities, suspected fraud, potential threats to the physical safety of any person, violations of our Terms of Use or as otherwise required by law.

If you have any questions about this Privacy Policy, please contact us at androidboy@naver.com

Last Update: Sep 07, 2023