This comparison is based on published official documentation. It is not a hands-on test or a quality ranking. Unknown features are not treated as verified.
ChatGPT is a general-purpose assistant for drafting, brainstorming and explaining concepts. Start with a small task; check plan coverage for chat, files and advanced work features separately.
Shared requirement: AI Writing Assistants
Different platform; check your workflow: Website → iPhone / iPad
Differences in documented information
No difference in recorded features; limits and sources still need separate review.
Check AI answers against their sources. Review account permissions and data settings before sharing private files or connections. Free download does not mean every task is free. Check in-app purchases, export limits and country/device availability in the store.
Claude helps with text, documents and code. Before assigning a long task, define the deliverable and review steps; access to connected apps and local computer files has different requirements.
Shared requirement: AI Writing Assistants
Different platform; check your workflow: Website → iPhone / iPad
Differences in documented information
No difference in recorded features; limits and sources still need separate review.
Check AI answers against their sources. Review account permissions and data settings before sharing private files or connections. Free download does not mean every task is free. Check in-app purchases, export limits and country/device availability in the store.
Gemini is Google's assistant for writing, learning and asking about uploaded content. Start by checking your Google account type, connected-app permissions and the features available on your device.
Shared requirement: AI Writing Assistants
Different platform; check your workflow: Website → iPhone / iPad
Differences in documented information
No difference in recorded features; limits and sources still need separate review.
Check AI answers against their sources. Review account permissions and data settings before sharing private files or connections. Free download does not mean every task is free. Check in-app purchases, export limits and country/device availability in the store.
Grok brings chat, web and X research, and creative tasks into one service. For current events, distinguish social posts from primary sources and check plan requirements for higher usage and advanced modes.
Shared requirement: AI Writing Assistants
Different platform; check your workflow: Website → iPhone / iPad
Differences in documented information
No difference in recorded features; limits and sources still need separate review.
Check AI answers against their sources. Review account permissions and data settings before sharing private files or connections. Free download does not mean every task is free. Check in-app purchases, export limits and country/device availability in the store.