Serif vs thread.
Serif
serif.aithread.
usethreademail.comSide by side
| Figure | Serif | thread. |
|---|---|---|
| Price from | $30/mo | Free |
| Free plan | Yes | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | — |
| Windows | Yes | — |
| macOS | Yes | — |
| iOS | Yes | — |
| Plans published | 6 | 1 |
| Spec score · AI Email Assistants | 8.7 (#6) | 7.1 (#34) |
| Audience | Serif describes its platform as automating email and document work for small businesses and operations teams. | The maker describes thread. as built for people who write a lot of email. |
| Product | Serif places an AI employee in shared addresses such as info@, support@, and billing@ to answer routine email. | thread. is an AI email assistant that reads an email thread, drafts a reply in your voice, and inserts it into Gmail or Outlook. |
| Voice matching | Serif studies a user's tone, phrasing, greetings and sign-offs and learns from edits to drafts. | Users can paste 3–5 past emails to help drafts match their writing style. |
Plans
Serif
- Lite$30 a month
- Standard$50 a month
- Pro$200 a month
- Team$50 a month
- EnterprisePriced on request
- FreeFree
In their own words
Serif
Serif places an AI employee in shared email addresses such as info@, support@ and billing@ to handle routine messages. It connects to Google Workspace or Microsoft 365, or can work with an address of its own. The assistant can qualify and route inquiries, answer common questions, collect paperwork, send quotes and follow up on unpaid invoices. Ambiguous or sensitive messages are escalated to the team, and users can approve replies before allowing independent operation. The shared inbox page offers $100 in free credits without a credit card, and each plan includes a 7-day free trial with full access. Listed plans include Lite at $30 a month, Standard at $50 a month, Pro at $200 a month, and Team at $50 a month per user; each is billed monthly. Serif says it is SOC 2 Type 2, GDPR and HIPAA compliant, and that emails are neither used to train general AI models nor stored on its servers. Apps are listed for web, macOS, Windows and iOS; Android is coming soon.
thread.
thread. has no write-up on Specifiction yet; its figures are above.