Spaces vs Missive
Missive is a team inbox and email client: shared email, SMS, WhatsApp, Instagram and Messenger, live chat, tasks and AI drafting, with its own MCP server and a REST API on its Productive plan and up — priced per user. Spaces is messaging infrastructure for AI agents: one REST API and one MCP server that let the agent you already use — in Claude, Grok, ChatGPT, Cursor or your own code — read and answer conversations on Instagram, WhatsApp, LinkedIn and Messenger.
In one line: Missive is a team inbox built around email, per user; Spaces is the connection your own agent uses to answer chats, per account. Here is how they differ, and when each is the better choice.
| Spaces | Missive | |
|---|---|---|
| What it is | Messaging API + MCP server for AI agents | Team inbox and email client with chat channels, tasks and AI drafting |
| Built for | Developers and businesses whose own agent answers customers on chat apps | Small businesses and teams that collaborate on email |
| Channels | Instagram, WhatsApp, LinkedIn and Messenger (inbox). TikTok posts and comments are live — no TikTok DM inbox. Facebook Pages coming soon. | Email (its centre of gravity), SMS through Twilio, SignalWire, Dialpad or Quo, WhatsApp, Instagram Business DMs, Messenger (Facebook Pages), live chat and custom channels. LinkedIn is not listed. |
| The number you already use, linked by QR code, and it keeps working on your phone. No Meta approval, no templates and no Meta message fees. | Meta's WhatsApp Business Platform with a verified Meta Business Account. Meta disables the WhatsApp Business app on that number — Coexistence "is not currently supported in Missive". No group chats. Meta bills usage directly. | |
| AI | No built-in agent: bring your own. Routines for new messages, keywords and no-reply follow-ups. | Missive AI with Anthropic, OpenAI or Gemini models, on Missive AI credits or your own key |
| MCP | https://api.spacesos.com/mcp, every plan including Free | https://mcp.missiveapp.com on Productive and Business, turned on by an admin: search conversations and contacts, check calendars, draft replies and — with a separate permission — send them |
| API | REST API on every plan, including Free | REST API on Productive and up: create drafts for email, SMS, WhatsApp and live chat and send them, posts, contacts, webhooks |
| Who you pay for | Connected accounts; no seats | Users |
| Price | Free: $0, 1 account, 50 actions a day, no card. Pay as you go: $9 per connected account a month, with 1,000 actions a month per account (pooled), then $5 per 1,000 (less at high volume). Reading messages is always free. No seats, no yearly option. | Per user a month: Starter $14 billed yearly ($18 monthly; no API or MCP), Productive $24 ($30 monthly; API and MCP), Business $36 ($45). 30-day free trial, no card. |
| 3-person team, 5 chat accounts | $45 a month (5 × $9, 5,000 actions pooled) | $72 a month on Productive billed yearly (3 × $24), or $90 monthly (3 × $30) — plus Meta's WhatsApp charges and AI usage |
Example assumes a team of three whose customers write in on WhatsApp, Instagram, Messenger and LinkedIn: on Spaces, five connected accounts within the included actions; on Missive, three users on Productive, the lowest plan with the API and MCP an agent needs (Missive cannot connect the LinkedIn profile). Missive Starter is cheaper — $42 a month billed yearly or $54 monthly for three users — but has no API or MCP. This is not a like-for-like price. Missive's users get a full shared email client, tasks and calendars, which Spaces does not include. Spaces' price does not include what your AI model costs to run. Prices exclude tax.
Choose Missive if
- Your team lives in email and wants to share, assign and discuss messages together.
- You want email, SMS and chat apps in one inbox for your people, with AI drafts to help them.
- You want an MCP server and API around a human team inbox.
- You are happy to move your WhatsApp number onto Meta's Business Platform.
Choose Spaces if
- Your own agent should answer customers on chat apps, without paying per user.
- You need LinkedIn conversations — Missive does not list LinkedIn.
- You want to keep using your WhatsApp number on your phone.
- You want an API and MCP server on every plan, including Free.
About how WhatsApp connects
Missive connects WhatsApp through Meta's Business Platform. Meta then disables the WhatsApp Business app on that number, and Missive says running both at once is not currently supported. Templates and Meta's charges apply.
Spaces does not use the Business API. It links the number you already use by QR code, and it keeps working on your phone. For up to 24 hours after a WhatsApp account connects, reconnects, or is disconnected and connected again, Spaces does not start new chats or outreach. Replies in chats that already exist still go out. Other channels have no reply-only window: the warm-up limits apply from the first day, and replies to people who wrote in go out immediately. That number stays under WhatsApp's own automation rules: Spaces keeps every account inside limits, which lowers the risk without removing it. For large template broadcasts, the official platform is the right tool. Sending limits · How Spaces keeps accounts safe · WhatsApp Business Platform vs QR code
Looking at other options too? See the best Missive alternatives.
Facts about Missive were checked on 11 November 2026 from Missive pricing, Missive MCP server, MCP permissions, Missive REST API and Missive WhatsApp FAQ. Spaces facts are from spacesos.com/pricing, WhatsApp API, safety and llms.txt. Prices and features change; their sites have the current version. Missive is a trademark of its owner.