Master Inbox FAQ
The questions teams ask before they connect a sequencer: what Master Inbox is, how it is priced, what it connects to, and how your data is handled.
About Master Inbox
What is Master Inbox?
Master Inbox is a reply management platform for outbound teams and agencies. It puts the replies from every sequencer, LinkedIn tool and inbound form into one AI-labeled inbox, so no reply sits unanswered in a tool nobody checks.
Who is Master Inbox built for?
It is built for agencies that run outbound for several clients, in-house outbound and sales teams, and RevOps leads who want one place to see every reply. Agencies get a workspace per client, and sales teams get one shared queue.
How is Master Inbox different from my sequencer's inbox?
Master Inbox reads the mailboxes themselves, so it also threads forwards, CC replies and new-address replies next to the replies a sequencer reports. It adds LinkedIn, AI labels, saved views, workflows and CRM sync in one queue across every sequencer you run.
Do I have to stop using Smartlead, Instantly or EmailBison?
No. Keep your sequencer for sending. Master Inbox works alongside Smartlead, Instantly, EmailBison, Reply.io, Lemlist and others, and labels written in Master Inbox can sync back, for example to stop a sequence when a meeting books.
How is Master Inbox different from a help desk or shared inbox like Front?
Help desks and shared inboxes are built for support tickets. Master Inbox is built for cold outbound replies: it keeps the thread tied to the prospect, labels intent, reads every connected mailbox and LinkedIn account, and reports on response time and missed replies.
Pricing and the free trial
How much does Master Inbox cost?
Plans are priced on connected mailboxes and client workspaces. Agency is $599 a month for up to 3,000 mailboxes and 15 client workspaces, Team is $799 a month for up to 2,000 mailboxes, and Reply Agent starts at $499 a month. Every larger plan is on the pricing page.
Is Master Inbox priced per seat?
No. Every plan includes unlimited users, so you can add reps, account managers and clients without changing the bill. Pricing follows mailboxes and client workspaces instead.
Is there a free trial?
Yes. Every plan starts with a free 7-day proof of concept (POC). You connect your real tools, see your own replies in one inbox, and decide after that.
What does onboarding look like?
Onboarding is done with you on a call. We connect your sequencers, mailboxes and LinkedIn tools, set up labels and views, and make sure replies are flowing before you rely on it.
Setup and integrations
Which tools does Master Inbox connect to?
Sequencers including Smartlead, Instantly, EmailBison, Reply.io, Lemlist and Salesforge. LinkedIn tools including HeyReach, Aimfox and Expandi. CRMs including HubSpot, Pipedrive, Attio, GoHighLevel, Salesforce and Close. Booking tools, Slack, Zapier, n8n and Clay as well. The full list is on the integrations page.
Does Master Inbox work with LinkedIn?
Yes. HeyReach, Expandi, Aimfox and native LinkedIn seats feed one inbox, threaded next to email per prospect, AI labeled and synced to your CRM.
Can an agency keep each client separate?
Yes. Each client gets a workspace with its own mailboxes, labels, members and limits. Workspaces clone in one click, and client logins see only their own inbox.
Does it sync with HubSpot and other CRMs?
Yes. Conversations, labels and stages sync to HubSpot, Pipedrive, Attio, GoHighLevel and Close, and reps can reply from inside HubSpot itself. Salesforce sync runs through webhooks and our OutboundSync partnership.
Is there an API?
Yes. A REST API with more than 150 endpoints covers replies, prospects, labels, views, workflows and workspaces, with webhooks for every event. It is included on every plan.
AI, labels and workflows
How does AI labeling work?
Every email and LinkedIn reply is labeled by intent as it lands. You start with thirteen default labels or define your own, and the model runs on your own OpenAI, Anthropic or OpenRouter key.
What are Reply Agents?
Reply Agents answer outbound replies, follow up and book meetings on your real calendar. You start human-in-the-loop, where a person approves each draft, and move to autonomous when you are ready.
What can workflows do?
Workflows run inside the inbox when a label is applied. They can post a Slack card with an approve button, sync to HubSpot, stop a sequence when a meeting books and fire webhooks, with no separate automation tool needed.
Can I measure response time and missed replies?
Yes. Reporting tracks the SLA on every reply, reply coverage, missed replies and team performance by channel and label. Agencies can share client reporting without giving the client a login.
Security and data
Where is my data hosted?
Master Inbox is hosted in the EU, in Finland and Germany.
Is Master Inbox GDPR ready?
Yes. Data processing agreements are on file, and the data processing addendum and sub-processor list are published. SOC 2 is in progress.
Who can see my replies?
Only the members you add to a workspace. Client logins are scoped to that client's inbox, and each workspace keeps its own data separate.
See every reply in one place
Master Inbox pulls email and LinkedIn replies from every sending tool into one inbox. Free 7-day POC. Unlimited users on every plan.
Start your free 7-day POC