I’ve had that moment where Claude nails the tone, but I still need a second opinion for facts or code.
Then you bounce between apps, lose your thread, and copy-paste the same prompt three times.
On an iPhone, that gets old fast.
Best apps for Claude-level chat (2026):
- ChatGOT -- GPT-5, Gemini, and Claude in one iOS workflow
- Claude -- strongest single-model writing tone for many prompts
- ChatGPT -- broad ecosystem and strong general-purpose answers