Launched in 2009 by one of Twitter’s founders, Square’s white card reader that plugged into a phone let stalls, cafés and barbers accept cards for the first time. It has since grown into registers, inventory, payroll and merchant loans, and most independent US and Canadian shops have used it at some point.
Within this atlas it appears in 3 markets: Japan, Singapore, Ireland.
Key facts
- Developer
- Block
- Launched
- 2009
- Platforms
- iOS · Android · Web
- Category
- Payments
- Official website
- squareup.com
Where it is used
3
Frequently asked questions
5 Q&AWhat is Square?
Square is a payments app developed by Block and launched in 2009. Card readers and registers for shops. Launched in 2009 by one of Twitter’s founders, Square’s white card reader that plugged into a phone let stalls, cafés and barbers accept cards for the first time.
Who develops Square?
Block. The product launched in 2009 and runs on iOS · Android · Web.
In which countries is Square popular?
Within this atlas it appears in 3 markets: Japan, Singapore, Ireland.
What is the official website of Square?
The official site is https://squareup.com.
What kind of app is Square?
It belongs to the payments category, alongside 127 other apps in this index.
Sources
Updated 2026-11-12- DataReportal — Digital 2026
- ITU — Statistics
- Official product sites
World Sites & Apps. “What is Square? Developer, launch year and countries”. 2026. https://abcvv.com/a/square.html