Simple, transparent pricing
Per-seat pricing. No hidden fees. 15-day free trial on every plan.
Starter
For small teams getting started with email security.
$3/ seat / month
- Up to 25 mailboxes
- Real-time phishing detection
- BEC & spoofing detection
- Quarantine dashboard
- Email notifications
- 5-day message trace
Most popular
Business
For growing teams that need deeper visibility and controls.
$5/ seat / month
- Unlimited mailboxes
- Everything in Starter
- Content compliance rules
- Allow / block lists
- 30-day message trace
- Slack & webhook alerts
- Read-only REST API
- Audit log
Enterprise
For large orgs and MSPs managing multiple GWS tenants.
Custom
- Everything in Business
- MSP multi-tenant dashboard
- Custom content rules
- Priority support SLA
- Dedicated onboarding
- SSO / SAML
- Custom data retention
- Invoice billing
Frequently asked questions
- Is there a free trial?
- Yes — every plan starts with a 15-day free trial. No credit card required until you decide to subscribe.
- How are seats counted?
- A seat is one Google Workspace mailbox protected by Koh. Shared mailboxes (aliases that deliver to an existing protected inbox) do not count as extra seats.
- Do you store email content?
- No. We never store email body text or attachments. Only metadata (sender, recipient, subject hash, timestamps) and cryptographic hashes are persisted. See our Privacy Policy for details.
- Can I cancel any time?
- Yes. Monthly plans can be cancelled any time; you retain access until the end of the billing period. Annual plans are refunded on a pro-rata basis within 30 days.
- Do you support MSPs?
- Yes. The Enterprise plan includes a multi-tenant dashboard so MSPs can manage and monitor all customer GWS tenants from a single login.