Serif vs Spark +AI
Serif
serif.ai
Spark +AI
sparkmailapp.comSide by side
| Figure | Serif | Spark +AI |
|---|---|---|
| Price from | $30/mo | $10/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | — |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| iOS | Yes | Yes |
| Android | — | Yes |
| Plans published | 6 | 4 |
| Spec score · AI Email Assistants | 8.7 (#6) | 8.6 (#7) |
| Company | The About page identifies founders Kevin Yang and James and says they met during their first week at Stanford. | Spark is part of Readdle, which describes itself as a privately held productivity software company. |
| Email providers | Serif connects to Google Workspace or Microsoft 365 and can also use an address of its own. | Spark supports Gmail, Google Workspace, Outlook, Office 365, Exchange Online, iCloud, Yahoo, and standard IMAP accounts. |
| Rating on G2 | 5.0 out of 5 from 1 review | 4.4 out of 5 from 60 reviews |
| Rating on Trustpilot | 3.8 out of 5 from 2 reviews | 2.2 out of 5 from 36 reviews |
| What it does | Serif describes itself as an AI workflow platform that automates email and document work for small businesses and operations teams. | Spark is a cross-platform email client with unified inboxes, calendar tools, collaboration, and AI email assistance. |
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.
Spark +AI
Spark +AI adds an AI assistant to Spark’s email app on Android, iOS, macOS, and Windows. It can search email, attachments, calendar items, and meeting notes, as well as draft or rephrase messages, proofread grammar and clarity, and translate. The assistant can check colleagues’ availability, schedule meetings, draft and send emails, and organize the inbox. It works with Gmail and Google Workspace, Outlook and Office 365 including Exchange Online, iCloud, Yahoo, and standard IMAP accounts; supported attachments are PDF and TXT. Spark lists integrations including Notion, Asana, Slack, Todoist, Zoom, Microsoft Teams, and HubSpot, with Salesforce and Pipedrive marked as coming soon. Spark says email and request history are processed locally, but a few query-related emails are sent to its AI provider; provider copies may be kept for up to 30 days for abuse monitoring. Spark says providers do not train models on user data, and AI can be disabled. Free includes five lifetime Meeting Notes; Plus costs $10 a month per user with 40 monthly notes, and Pro costs $20 a month per user with unlimited notes. AI features also use monthly quota.