Coherence vs Serif
Coherence
getcoherence.io
Serif
serif.aiSide by side
| Figure | Coherence | Serif |
|---|---|---|
| Price from | $12/mo | $30/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| iOS | — | Yes |
| Android | Yes | — |
| API | Yes | — |
| Plans published | 4 | 6 |
| Spec score · Email Collaboration Software | 9.5 (#1) | 8.8 (#9) |
| Spec score · Shared Inbox Software | 9.5 (#1) | 8.9 (#7) |
| Company | The site footer identifies Brightyard, Inc. as the company behind Coherence. | The About page identifies founders Kevin Yang and James and says they met during their first week at Stanford. |
| Email providers | Two-way mailbox synchronization supports Gmail/Google Workspace and Outlook/Microsoft 365. | Serif connects to Google Workspace or Microsoft 365 and can also use an address of its own. |
| Product | Coherence describes itself as a customer operations platform that connects CRM data, communications, workflows, websites, campaigns, and AI agents. | Serif places an AI employee in shared addresses such as info@, support@, and billing@ to answer routine email. |
| Security | Coherence says data is encrypted with AES-256 at rest and TLS 1.2 or higher in transit, and that it is hosted on SOC 2 certified infrastructure. | 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. |
| Security controls | The service advertises role-based permissions, Team-plan audit trails and scoped API keys that can be revoked. | Serif states that emails are not used to train general models, are not stored on its servers, and that learned data is encrypted at rest. |
| Shared inbox | The Shared Inbox gives teams assignment, internal notes, shared drafts, categories, rules, reminders and response targets for managed mailboxes. | Its AI employee operates in addresses such as info@, support@ and billing@, handling routine conversations for teams. |
| What it does | Coherence is a workspace that links communications, business records, workflows and AI assistance in one system. | Serif describes itself as an AI workflow platform that automates email and document work for small businesses and operations teams. |
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
Coherence
Coherence is a customer operations platform connecting CRM data, communications, workflows, websites, campaigns, and AI agents. Its Shared Inbox gives sales, support, and operations a common place to handle incoming conversations with customer context, replies, and internal discussion. Teams can assign conversation ownership, add internal notes, view teammate presence, and work on shared drafts. Inbox categories, custom fields, rules, assignment settings, response targets, snoozes, and reminders help organize queues. Staff can select published Knowledge articles and review suggested replies with source references, then edit drafts before sending; AI generation uses the workspace's configured AI provider. Shared Inbox is available on Pro, Team, and Enterprise. Listed integrations include two-way Gmail or Outlook email sync, Google or Microsoft Calendar sync, and a REST API. Coherence says data is encrypted at rest with AES-256 and in transit with TLS 1.2 or higher, and stored in the United States. The service is not currently available in the EEA, UK, Switzerland, Australia, Canada, and several other regions. Pro costs $29 a month per user; Team requires at least 10 paid seats.
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.