Users can enter using their email address, Apple account or other supported platforms.
The app has drawn attention for its conversational, humorous tone.
In December 2024, a free version became available with limited usage, such as 10 daily inquiries.
X CEO Musk has positioned the assistant as a direct rival to prominent chatbots but with a distinct personality.
At launch, he posted on X that Grok would be “funny” and “politically neutral.”