Privacy Policy
At Online Number Line (onlinenumberline.com), student privacy and classroom trust are our highest priorities. We are committed to maintaining a completely safe, transparent, and account-free visual math environment for K–5 students and educators.
No Accounts Required
Students and teachers can use all virtual manipulatives immediately with zero registration or logins.
No PII Collected
We never collect names, email addresses, student IDs, or location data from children or schools.
COPPA & FERPA Mindset
Designed specifically to comply with children's online privacy protection laws and school standards.
01.Overview & Student Privacy Philosophy
Online Number Line (onlinenumberline.com) provides interactive mathematical visualizers, digital manipulatives, and printable PDF worksheet tools for teachers, parents, and elementary students.
Because our platform is tailored for classroom instruction and home practice, we strictly adhere to a privacy-by-design architecture. Students are never prompted to enter personal information, create accounts, or link social media profiles.
02.Children’s Privacy (COPPA & FERPA)
We strictly honor the Children’s Online Privacy Protection Act (COPPA) and the Family Educational Rights and Privacy Act (FERPA).
- We do not knowingly collect, ask for, or store any Personally Identifiable Information (PII) from children under the age of 13.
- No names, usernames, email addresses, phone numbers, or physical locations are requested or saved.
- We do not sell, rent, trade, or monetize any user data to third parties under any circumstances.
03.Browser Local Storage & Technical Data
To enhance user experience without using tracking cookies, onlinenumberline.com uses your web browser’s client-side localStorage solely for non-sensitive interface preferences:
theme: Remembers light or dark mode selection ('light' | 'dark')numberline_config: Remembers transient range settings (e.g. min, max, step size) for your current interactive sessionThis data remains exclusively on your device browser and is never transmitted to our servers or stored remotely.
04.Server Logs & Anonymous Analytics
Like virtually all web servers, standard non-identifying technical data (such as web browser type, referring URL, time of request, and IP address for firewall defense) may be temporarily processed in standard server logs for system reliability, error debugging, and security prevention.
This technical server log information is never cross-referenced with student identities and is automatically rotated and purged.
05.Third-Party Services & Links
Our site relies on trusted, privacy-respecting infrastructure providers:
- Google Fonts: Used to render clean typography (Inter & JetBrains Mono) without storing personal user profiles.
- Content Delivery Networks (CDNs): Used to deliver high-performance static HTML/JS assets to classroom devices quickly.
Our website may contain links to educational resources. We encourage users to review the privacy policies of external sites before visiting.
06.Contact Us Regarding Privacy
If you have questions, feedback, or school district privacy inquiry requirements, please reach out to us directly: