Honest comparison
Missive Alternative: A Unified Inbox for One Person, Not a Team Shared Inbox
Connect every mailbox you own to one board, in the browser, and let AI read each message to categorize it and flag spam before you open it.
Any IMAP provider · AI category + spam per message · Two-way sync
In short
Missive is a team collaboration layer on top of email: shared inboxes, assignment, internal comments on a thread, real-time collaborative drafting, and SMS and WhatsApp in the same conversation model. It starts at $14 per user per month billed yearly ($18 monthly) and has a free plan for up to 3 users. Inboxes is a different product with a similar-sounding feature. It is a unified inbox for the accounts one person owns, running in the browser, where an AI model reads every incoming message and assigns it a category and a spam verdict. If several people need to work one mailbox together, buy Missive. If one person needs many mailboxes triaged automatically, that is what Inboxes does.
The difference
Where Inboxes and Missive actually diverge
Missive is the best-known product in the shared-inbox category and it deserves the reputation. A team can point support@ and sales@ at it, assign conversations, argue about a reply in an internal comment nobody outside sees, and draft the answer together in real time. It also handles SMS through Twilio, WhatsApp, Messenger, and Instagram in the same thread model, so a customer conversation stays one conversation across channels. Its AI assistant (available on the Productive and Business plans) can draft, summarize, translate, and run AI rules that route or label incoming messages, with a choice of OpenAI, Anthropic, or Google models and the option to bring your own key. The reason people arrive here from Missive is usually that they were never really the customer. Missive is priced and designed per seat around a mailbox several humans share. If you are one person with a personal Gmail, a work domain, an old Yahoo account, and two client aliases, the shared-inbox machinery is overhead: you do not need assignment, you need the pile sorted. Inboxes is built for that case. Connect every IMAP mailbox, get one board in any browser, and every message that lands is read by an AI model that decides what it is (work, personal, receipts, newsletters, notifications) and whether it is spam, before you look at it.
Side by side
Inboxes vs Missive
| Capability | Inboxes | Missive |
|---|---|---|
| Unified inbox across your own accounts | Yes | Yes |
| Works in any browser, nothing to install | Yes | Web app plus native Mac, Windows, iOS, Android |
| AI categorizes every message automatically | Yes | AI rules on Productive and Business plans |
| AI spam detection on top of the provider filter | Yes | No |
| Any IMAP mailbox (Gmail, Outlook, iCloud, own domain) | Yes | Yes |
| Shared team inbox, assignment, internal comments | No | Yes |
| SMS, WhatsApp, Messenger, Instagram in the same thread | No | Yes |
| SOC 2 Type II, SAML SSO, audit trail | No | Yes |
| AI that drafts and rewrites your replies | No | Yes |
| Entry price | $29/mo flat | Free for up to 3 users, Starter $14/user/mo yearly |
Pricing and features verified from each vendor's public pricing page in July 2026, and quoted in the currency the vendor publishes. Both products change, so check the current page before you buy.
// Where Missive wins
Missive wins outright for teams, and it is not close. Internal comments, assignment, multiple assignees, watchers, collaborative drafting, chat, guest access, and an audit trail are real features we do not have and are not building. It has SOC 2 Type II, SAML SSO, and IP restrictions, which matter if you are buying for a company rather than yourself. It has native apps on macOS, Windows, iOS, and Android, up to a thousand deterministic rules, an API, and integrations with Hubspot, Salesforce, Asana, and Pipedrive. It also has a permanent free plan for up to 3 users and it is cheaper per seat than us at the entry tier. If anyone else needs to see or touch the mailbox, stop reading and buy Missive.
FAQ
Questions people ask before switching
What is the best Missive alternative?
It depends which half of Missive you use. If you need the shared team inbox, the alternatives are Front, Help Scout, and Hiver, not us. If you only ever used Missive to see your own several accounts in one place, Inboxes is the closer fit: a browser-based unified inbox across every IMAP account with AI that categorizes each message and flags spam.
Is Missive free?
Missive has a permanent free plan, limited to 3 users, 15 days of history, 2 personal accounts, and 2 shared accounts for the whole organization. Paid plans start at $14 per user per month billed yearly, or $18 billed monthly, verified from the Missive pricing page in July 2026. Inboxes has no free plan; it is one flat plan from $29 a month.
Is Missive good for one person?
It works, but you are paying for a collaboration product you will not use. Assignment, internal comments, watchers, and team analytics only mean something when more than one person is in the mailbox. A solo user with several accounts gets more from a tool aimed at triage rather than teamwork.
Does Missive sort my email with AI?
Missive has an AI assistant on its Productive and Business plans that can draft, summarize, translate, and run AI rules that route or label incoming messages. It is capable, and it is configured: you write the rules the AI applies. Inboxes categorizes every message by default with nothing to configure, and adds a spam verdict per message on top of your provider filter.
Keep comparing
More on running every mailbox from one place
Put every mailbox on one sorted board
Connect your accounts over IMAP and let the AI categorize and de-spam your mail from the first message.