Inbox Zero vs Serif
Inbox Zero
inbox-zero.ai
Serif
serif.aiSide by side
| Figure | Inbox Zero | Serif |
|---|---|---|
| Price from | $20/mo | $30/mo |
| Free plan | — | Yes |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| iOS | Yes | Yes |
| Android | Yes | — |
| API | Yes | — |
| Self-hosted | Yes | — |
| Plans published | 4 | 6 |
| Spec score · AI Email Assistants | 8.4 (#8) | 8.7 (#6) |
| Audience | The product is built for founders, operators, and professionals who receive more email than they can handle manually. | Serif describes its platform as automating email and document work for small businesses and operations teams. |
| Email providers | It supports Gmail, Google Workspace, and Microsoft Outlook email accounts. | Serif connects to Google Workspace or Microsoft 365 and can also use an address of its own. |
| Security | The hosted product is SOC 2 compliant, and the Trust Center identifies SOC 2 Type 2 compliance. | Serif states that it is SOC 2 Type 2, GDPR, and HIPAA compliant, and that emails are not used to train general AI models or stored on its servers. |
Plans
Inbox Zero
- Starter$20 a month
- Plus$35 a month
- Professional$50 a month
- EnterprisePriced on request
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
Inbox Zero
Inbox Zero has no write-up on Specifiction yet; its figures are above.
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.