Two genuinely useful tools, built for different jobs
Gemini is Google's assistant inside Gmail. Its Help me write feature is genuinely capable: type a prompt and it drafts a message, and you can refine it with Formalize, Shorten, or Elaborate. For a fast first pass on a routine note, that's often all you need — and it's free with a qualifying Google Workspace or Google One plan.
Persona is a Gmail AI built around one question Gemini doesn't ask: how should this email make the reader feel? Instead of generic "make it more formal," Persona gives you an explicit persona plus dials for the specific behavioral levers that decide whether a message lands as confident, warm, or urgent.
The core difference: behavioral control, not just length and tone presets
Gemini's refinements move along a few fixed axes. Persona exposes 7 writing personas and 8 behavioral dials — assertiveness, warmth, urgency, brevity, formality, and more — so you steer the message instead of accepting a preset.
- Persona, not just a prompt. Pick a voice — diplomat, closer, operator — and the whole draft inherits that posture.
- Reads the thread, not just your instruction. Persona pulls in the Gmail conversation so a reply to a frustrated client and a reply to a peer aren't written the same way.
- My Voice. Train Persona on emails in your own style so drafts sound like you, not like a generic assistant.
- One click, no copy-paste. Everything happens inside the Gmail compose window — see the AI email writer for the full flow.
Side by side
| Capability | Gemini (Help me write) | Persona |
|---|---|---|
| Drafts an email from a prompt | Yes | Yes |
| Formalize / shorten / elaborate | Yes | Yes |
| Explicit writing personas | No | 7 personas |
| Behavioral tone dials | No | 8 dials (assertiveness, warmth, urgency, brevity, formality…) |
| Reads the Gmail thread for context | Limited | Yes — uses the conversation |
| Learns your personal voice | No | My Voice |
| PII stripped before sending to the model | Per Google policy | Names, emails, phones stripped in-browser |
| Works inside Gmail | Yes | Yes — Chrome extension |
| Free to start | With qualifying Google plan | 15 emails, no credit card |
Private by design
Before any draft request leaves your browser, Persona strips names, email addresses, and phone numbers — the model shapes the tone without ever receiving the personal details. Read more on our privacy page, and see how Persona stacks up across the category on best AI email tools.