Privacy Policy
Last updated: September 17, 2026
BiostatWorks (“we,” “our,” or “us”) operates the website biostatworks.com and also publish mobile applications under the developer name AZ App Studio, including SplitEasy, CalcKit, SpinPick, Between Us, and SampleSize Pro.
This Privacy Policy explains how we may collect, use, and protect information when you visit our website, use our online calculators, access educational content, request consulting services, or use our mobile applications.
Information We Collect
BiostatWorks may collect limited information when you use our website, including:
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Information you choose to provide through contact forms or consultation request forms, such as your name, email address, and message.
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Basic website usage information, such as pages visited, browser type, device type, and general geographic location.
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Information collected through cookies or similar technologies.
We do not ask users to enter sensitive personal health information into our calculators. Our calculators are intended for general statistical and educational use.
How We Use Information
We may use collected information to:
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Respond to messages or consultation requests.
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Improve our website, calculators, mobile applications, and educational content.
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Understand how visitors use our services.
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Maintain website and application security and performance.
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Display advertisements where advertising services are enabled.
Mobile Applications
BiostatWorks may publish mobile applications under the developer name AZ App Studio. Our mobile applications currently include:
SplitEasy – Bill & Tip Splitter
SplitEasy performs bill, tip, and bill-splitting calculations. Information entered into the calculator, such as bill amounts, tip percentages, and number of people, is used to perform calculations on the user's device. The app does not require an account, and BiostatWorks does not intentionally collect or transmit this calculator information.
CalcKit – Everyday Calculator & Unit Converter
CalcKit provides calculators and unit-conversion tools. Values entered by users are used to perform calculations on the user's device. The app does not require an account, and BiostatWorks does not intentionally collect or transmit values entered into the calculators.
SpinPick – Random Decision Maker
SpinPick provides random-selection tools including a spin wheel, coin flip, dice roller, random number generator, name picker, and yes/no selector. Information entered into these tools is used locally on the user's device to provide the requested result. The app does not require an account, and BiostatWorks does not intentionally collect or transmit this information.
Between Us – Couples Questions
Between Us provides conversation questions, couple matching activities, Would You Rather questions, and favorites. Optional information such as partner names, favorites, previously viewed questions, and game progress may be stored locally on the user's device so that app features can function between sessions. This information is not intentionally transmitted to BiostatWorks and no user account is required.
SampleSize Pro – Study Power & Sample Size
SampleSize Pro provides statistical sample-size and power calculations for research and educational purposes. Information entered into the calculator, including study assumptions, expected outcomes, power, significance level, and dropout estimates, is processed on the user's device. Recent calculations may be stored locally on the device when the user uses the save functionality. Information is shared outside the app only when the user intentionally uses a sharing feature. No user account is required.
Local Data Storage
Some AZ App Studio applications may store limited information locally on the user's device to support features such as saved calculations, favorites, app preferences, game progress, or previously viewed content.
This locally stored information is not intentionally transmitted to BiostatWorks unless a feature specifically requires transmission or the user intentionally chooses to share information.
Users can generally remove locally stored application data by clearing the application's storage or uninstalling the application.
Cookies and Advertising
BiostatWorks may use cookies and similar technologies to improve performance, understand visitor activity, and support advertising.
Third-party vendors, including Google, may use cookies or similar technologies to provide advertisements based on a user's visits to websites or use of applications.
Users may manage or disable cookies through their browser settings and may manage personalized advertising through Google's advertising settings.
Google AdSense
BiostatWorks may use Google AdSense to display advertisements on biostatworks.com.
Google and its advertising partners may collect and use information through cookies, web beacons, or similar technologies to provide personalized or non-personalized advertisements.
We do not control the cookies or tracking technologies used by third-party advertisers. Users should review Google's privacy and advertising policies for additional information about how Google uses data.
Google AdMob
AZ App Studio applications may support advertising in future versions.
If Google AdMob or another advertising service is added to an application, this Privacy Policy will be updated as appropriate. Advertising providers may process information such as device identifiers, IP address, device information, advertising information, and interactions with advertisements in accordance with their own privacy policies.
The current version of an application may not contain advertising even if advertising is described as a possible future feature in this Privacy Policy.
Analytics and Website Tools
BiostatWorks may use website tools, analytics services, or platform services provided by Wix or other third parties to understand website traffic and improve the user experience.
These services may collect information such as page views, device type, browser type, and general geographic location.
Links to Other Websites
Our website and applications may contain links to external websites.
BiostatWorks is not responsible for the privacy practices, content, or policies of third-party websites. Users should review the privacy policies of any external websites they visit.
Data Security
We take reasonable steps to protect information submitted through our website and services.
However, no method of electronic transmission or storage is completely secure, and we cannot guarantee absolute security.
Children's Privacy
BiostatWorks and mobile applications published under AZ App Studio are intended for a general audience and are not specifically directed toward children.
We do not knowingly seek to collect personal information from children. If we become aware that personal information has been submitted by a child without appropriate consent, we will take reasonable steps to delete it.
Changes to This Privacy Policy
We may update this Privacy Policy from time to time.
Any changes will be posted on this page with an updated Last updated date.
Contact Us
If you have questions about this Privacy Policy, please contact us through the contact form on our website or by email: