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InboxKit

InboxKit vs ClayInbox

ClayInbox is cheaper: $2 for Google and $2.50 for Microsoft 365, with warmup included. Its Google mailboxes run on EDU or legacy panels. InboxKit sells official, paid seats at $3, or $2.50 annual.

  • Unlimited team members and workspaces
  • One-click export to 24+ sequencers
  • 24/7 support on Slack, chat and email
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Free account. Pay per mailbox.

G2 High Performer, Email Deliverability, Spring 2026G2 High Performer, Small Business, Email Deliverability, Spring 20264.7 on G2 · 120 reviews

InboxKit vs ClayInbox

Checked 19 Oct
InboxKit vs ClayInbox
InboxKitClayInbox
Google seat typeOfficial, paidEDU or legacy panels
Mailbox price$3, or $2.50 annual$2 Google, $2.50 Microsoft
Azure$30 per 100$25 per 100
G2 rating4.7 (120 reviews)Not on G2

Teams sending on InboxKit

  • Vectify logo
  • HeyReach logo
  • C17 Labs logo
  • Anevo Marketing logo
  • Understory logo
  • NoBroker logo
  • Zendesk logo
  • Gorgias logo
  • Expandi logo
  • LeadMagic logo

InboxKit or ClayInbox: the short answer

By InboxKit Team. Updated 20 Oct 2026. Competitor details come from ClayInbox’s own pages, linked under the table.

Choose InboxKit if

  • You want official, paid Google Workspace and Microsoft 365 seats
  • You want 24/7 support on Slack, in-app chat and email
  • You want unlimited team members, and a workspace for each client

Choose ClayInbox if

  • You want a lower price: $2 Google and $2.50 Microsoft 365 mailboxes
  • You want warmup, blacklist checks and placement tests included in that price
  • You run Microsoft on Azure at $25 a domain for up to 100 mailboxes

InboxKit vs ClayInbox, line by line

Taken from public pages. Where ClayInbox publishes nothing, the cell says so.

InboxKit compared with ClayInbox
InboxKitClayInbox
MailboxesOfficial, paid Google Workspace and Microsoft 365, plus AzureGoogle Workspace on EDU or legacy panels, Microsoft 365, Azure and dedicated SMTP
Claude Code / Codex (MCP)Remote MCP server, connects to Claude Code and CodexMCP server on every account
Google$3 a mailbox, or $2.50 on annual billing$2 a mailbox at any volume
Microsoft 365$3 a mailbox, or $2.50 on annual billing$2.50 a mailbox
Azure$30 a tenant for up to 100 mailboxes$25 a domain for up to 100 mailboxes
Setup timeOrders completed in 30 to 120 minutes, automaticallyAbout 30 minutes to the first warmup email
APIFull REST API with webhooks on every account, 119 endpoints70+ REST endpoints and webhooks
BillingMonthly, or annual at $2.50; no plans, no minimumsMonthly, prorated by the day; no setup or platform fee
Warmup (add-on)14 days on an isolated network, $3 a mailboxIncluded on every mailbox, on an isolated network
Monitoring (add-on)InfraGuard: blacklists, DNS, bounces and placement every six hours, with auto-pauseIncluded: 50+ blacklists, DNS drift alerts, placement tests, weekly reports
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Price it at your volume

Common volumes, side by side, at published prices.

Monthly price at common volumes, InboxKit and ClayInbox
100mailboxesGoogle, monthly billingInboxKit, monthly$300Annual billing$250ClayInbox, monthly$200Lower
1,000mailboxesGoogle, monthly billingInboxKit, monthly$3,000Annual billing$2,500ClayInbox, monthly$2,000Lower
500mailboxesMicrosoft 365, monthly billingInboxKit, monthly$1,500Annual billing$1,250SameClayInbox, monthly$1,250Same
100mailboxesMicrosoft on Azure: one tenant against one domainInboxKit, monthly$30Annual billing-ClayInbox, monthly$25Lower

ClayInbox is cheaper on Google, Microsoft 365 and Azure, with warmup included in its price.

ClayInbox lists Google at $2, Microsoft 365 at $2.50 and Azure at $25 a domain. Warmup and checks are in its price.

Get startedBook a demo

InboxKit vs ClayInbox, in detail

ClayInbox pricing against InboxKit

ClayInbox charges a flat $2 a Google mailbox at any volume, and $2.50 for Microsoft 365. Azure is $25 a domain for up to 100 mailboxes. Billing is monthly and prorated by the day, with no setup or platform fee.

Warmup and monitoring are part of ClayInbox’s price. InboxKit is $3 a mailbox on monthly billing, or $2.50 on annual, for Google or Microsoft 365. Azure is $30 a tenant for up to 100, and warmup is a $3 add-on.

At 1,000 Google mailboxes, ClayInbox costs $2,000 a month and InboxKit $3,000, or $2,500 on annual billing. 500 Microsoft 365 mailboxes cost $1,250 there and $1,500 here.

ClayInbox mailboxes: Google panels, Microsoft 365 and Azure

ClayInbox sells Google Workspace, Microsoft 365, Azure tenants and dedicated SMTP. Its Google page calls them real Workspace accounts with admin access. Its Google mailboxes run on EDU or legacy panels. Pre-warmed Google mailboxes add $2.

InboxKit sells official, paid Google Workspace and Microsoft 365 seats, both at $3. Microsoft volume can run on Azure, where one tenant holds up to 100 mailboxes for $30 a month. Pre-warmed mailboxes are live in hours.

ClayInbox setup and domains

ClayInbox says it takes about 30 minutes from purchase to the first warmup email. It also says you can audit, export and migrate mailboxes at any time.

InboxKit completes orders in 30 to 120 minutes, automatically, with SPF, DKIM and DMARC configured for you. You buy domains or connect your own in one click. Domain rotation, domain warmup and email migration are built in.

ClayInbox warmup and monitoring

Every ClayInbox mailbox warms on an isolated network at no extra cost. Blacklist monitoring across 50+ lists, DNS drift alerts and unlimited placement tests are included, with weekly health reports.

InboxKit’s warmup is a $3 add-on that runs for 14 days on an isolated network. InfraGuard, also an add-on, checks blacklists, DNS, bounces and inbox placement every six hours. It includes alerts, auto-pause and unlimited placement tests. Its first month is free.

ClayInbox API, MCP and automation

ClayInbox includes a REST API with 70+ endpoints, webhooks and an MCP server on every account.

Every InboxKit account gets the full REST API, with 119 endpoints and webhooks. Connect Claude Code or Codex to InboxKit’s remote MCP server to run your mailbox work from an agent.

ClayInbox reviews, terms and support

InboxKit is rated 4.7 out of 5 on G2 from 120 reviews. We found no G2 listing for ClayInbox.

ClayInbox’s footer links to Terms and Privacy. When we checked on 19 October 2026, both opened a 404 page.

InboxKit support runs 24/7 on Slack, in-app chat and email. Every account gets unlimited team members and workspaces, so each client can have its own.

Switch from ClayInbox in four steps

  1. Create a free account

    Pay only for the mailboxes you add. No plan to pick first.

  2. Buy or connect domains

    Then add Google Workspace, Microsoft 365 or Azure mailboxes on them.

  3. Export to your sequencer

    One click to 24+ sequencers, including Smartlead and Instantly.

  4. Run both side by side

    Warm up here while ClayInbox keeps sending. Move campaigns before your plan renews.

From teams sending on InboxKit

  • G2 High Performer, Email Deliverability, Spring 2026
  • G2 High Performer, Small Business, Email Deliverability, Spring 2026
  • G2 High Performer, Asia Pacific, Email Deliverability, Spring 2026
  • G2 High Performer, India, Email Deliverability, Spring 2026

G2 High Performer, Spring 2026, rated 4.7 out of 5 from 120 reviews

  • Burned through 9 domains in 6 weeks with our old setup. Same domains have been running fine on InboxKit since March.
    Photo of LukaLukaManyreach
  • Our agency manages 40 client accounts now. Would have been impossible before this.
    Photo of Walter WinnWalter WinnAnevo Marketing
  • Our ops guy used to manually configure DNS for every mailbox. Now he's actually doing ops work instead.
    Photo of Atishay JainAtishay JainEagle Info Services

Questions about ClayInbox

Short answers, from the published prices and pages linked under the table.

  • Is ClayInbox cheaper than InboxKit?

    Yes. ClayInbox lists Google at $2 and Microsoft 365 at $2.50, with warmup and monitoring included. InboxKit is $3, or $2.50 on annual billing, and warmup is a $3 add-on.

  • How does ClayInbox pricing work?

    Prices are flat each month. Google is $2 a mailbox and Microsoft 365 is $2.50. Azure is $25 a domain for up to 100 mailboxes. Billing is prorated by the day, with no setup fee.

  • Are ClayInbox’s Google mailboxes paid Google Workspace seats?

    No. ClayInbox’s Google mailboxes run on EDU or legacy panels. InboxKit sells official, paid Google Workspace and Microsoft 365 seats.

  • Does ClayInbox have an API and an MCP server?

    Yes. ClayInbox includes 70+ REST endpoints, webhooks and an MCP server on every account. InboxKit includes 119 REST endpoints, webhooks and a remote MCP server for Claude Code and Codex.

  • Is ClayInbox legit?

    ClayInbox’s live site is clayinbox.ai, where it publishes its prices. When we checked on 19 October 2026, its Terms and Privacy links opened a 404 page. We found no G2 listing for it.

  • How do I move from ClayInbox to InboxKit?

    Open a free account, buy or connect domains, and add mailboxes. Export them in one click to your sequencer. Keep ClayInbox sending until your campaigns have moved.

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Open a free account. Pay only for the mailboxes you add.

$3 a mailbox a month, or $2.50 on annual billing. No plans, no minimums.

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