Spaces vs Buffer: an agent that answers DMs, or a tool that publishes posts
Buffer plans, schedules and publishes social media posts, with analytics and a Community inbox for replying to comments. It also has a GraphQL API and an MCP server on every plan, including Free, so an AI assistant can draft and schedule posts into your Buffer queue.
Spaces is communication infrastructure for AI agents: one REST API and one MCP server that let the agent you already use answer customer conversations on the Instagram, WhatsApp, LinkedIn and Facebook Messenger accounts a business already has, inside each platform's limits.
Both have an API and an MCP server, but they do different jobs: Buffer's API and MCP move posts. Spaces' API and MCP move conversations. Buffer Essentials also costs less, because publishing is a different job from answering DMs. Here is how they compare, and when each one is the better choice.
Spaces vs Buffer at a glance
| Spaces | Buffer | |
|---|---|---|
| What it is | An API and MCP server that let AI agents message customers and act on the accounts a business already uses | A tool for planning, scheduling and publishing social media posts, with analytics and a Community inbox for comments |
| Built for | AI developers, agent builders, and businesses whose customers message them on chat apps | Creators, small businesses, agencies, nonprofits, higher education and developers who publish on several social networks |
| Main job | Answering and following up on customer chats | Publishing posts from a calendar and queue |
| Live channels | Instagram, WhatsApp, LinkedIn and Facebook Messenger (inbox). TikTok posts and comments are live. Facebook Pages is coming soon. | Publishing to Instagram, Facebook, TikTok, LinkedIn, X, YouTube (Shorts), Threads, Pinterest, Google Business Profile, Bluesky, Mastodon and Substack |
| Direct messages | Yes, this is the core product | Not mentioned on the Buffer pages we checked. Community covers comments. |
| Your existing number, connected by scanning a QR code. No Meta approval, no message templates and no Meta message fees. | Not listed as a channel | |
| API | REST API on every plan | GraphQL API on every plan, including Free |
| MCP server | Included on every plan | Included on every plan, including Free |
| What an agent does through MCP | Reads inboxes, replies, schedules messages, runs routines. Pay as you go adds follow-ups that stop when someone replies, and webhooks (not on Free). | Creates and schedules posts, manages the queue, saves ideas, and checks channels and upcoming content |
| Works with | Claude, ChatGPT, Grok, Cursor and other agents, through one MCP server | Claude, ChatGPT, Cursor, Raycast, Perplexity and others, through its MCP server |
| Usage allowance | Free: 50 actions a day; sending stops until midnight, reading keeps working. Pay as you go: 1,000 actions per account a month, pooled, then $5 per 1,000 ($4 above 100,000 extra, $3 above 1,000,000). Reading is always free. | API: 1,000 (Free), 3,000 (Essentials) or 10,000 (Team) requests per channel per 30 days, capped at 3,000 / 30,000 / 100,000 |
| Safety | Per-channel daily limits, pacing and warm-up, read-only keys, pause and revoke, optional human approval before sends | Posts from AI assistants land in your Buffer queue for review |
| Free plan | Yes. 1 account, 50 actions a day, API and MCP included. No card needed. | Yes. Up to 3 channels, 10 scheduled posts per channel |
| Starting price, monthly billing | Pay as you go: $9 per connected account a month | Essentials: $6 a channel a month. Team: $12 a channel a month (channels 1–10) |
| Starting price, yearly billing | No yearly option listed on /pricing | Essentials: $5 a channel a month. Team: $10 a channel a month |
| 5 accounts or channels, monthly billing | $45 a month (Pay as you go: 5 × $9, with 5,000 actions a month included, pooled) | $30 a month (Essentials, 5 × $6) or $60 a month (Team, 5 × $12) |
| 5 accounts or channels, yearly billing | No yearly option; $45 a month | $25 a month (Essentials) or $50 a month (Team) |
About the 5-account example: Spaces counts a chat account as one Instagram profile, WhatsApp number, LinkedIn profile or Facebook account. Buffer counts a channel as one connected social account. Prices are in USD and exclude tax. Sources: spacesos.com/pricing and buffer.com/pricing.md, checked 11 November 2026. Buffer Essentials is cheaper; Buffer Team costs more than Spaces. The two prices pay for different jobs: Buffer publishes posts, and Spaces runs conversations.
Choose Buffer if
- Your main job is planning, scheduling and publishing posts on a visual calendar.
- You publish to networks Spaces doesn't cover, such as YouTube, Pinterest, Threads, Bluesky, Mastodon, Substack or Google Business Profile.
- You want post analytics and reports, including branded reports on Buffer's Team plan.
- You want a bigger free plan for posting. Buffer is free for up to 3 channels; Spaces Free covers 1 chat account and 50 actions a day.
- You want an AI assistant to draft and schedule posts through MCP. Buffer already does this well, on every plan.
- You need team approval workflows and access controls for posts.
Choose Spaces if
- You are building an AI agent that has to answer customers on Instagram, WhatsApp, LinkedIn or Messenger, through one API and MCP server.
- You want to keep the WhatsApp number and social accounts the business already uses.
- You need follow-ups that stop as soon as someone replies, webhooks for every new message, and scheduled messages (follow-ups and webhooks on Pay as you go).
- You want account safety built in: daily limits, pacing, warm-up, pause, and human approval of replies.
- You are an agency running chat accounts for clients and want per-account pricing on one bill.
Many teams can reasonably use both: Buffer for the content calendar, Spaces for the inbox.
Where they differ
Posts vs conversations
Buffer's Community feature replies to comments on your posts, with AI reply suggestions (5 a week on Free, unlimited on paid plans). On the Buffer pages we checked, direct messages, WhatsApp and Messenger are not mentioned.
Spaces starts with the private conversation: a WhatsApp question about opening hours, an Instagram DM about stock, or a LinkedIn reply to a follow-up. The agent reads the chat, answers in it, and hands it to a person when needed. On LinkedIn and Instagram, the agent can also reply to comments on the account's own posts, within each platform's limits.
Both have MCP, for different things
This isn't a choice between having an API and not having one. Buffer's GraphQL API and MCP server are available on every plan, including Free. Through them, an assistant can create and schedule posts, manage the queue and save ideas, and everything lands in Buffer for you to review.
Spaces' MCP server (https://api.spacesos.com/mcp, plus one server per channel) gives the agent messaging tools: it can read conversations, reply, schedule a message for a local time, and run routines that start on a new message, a keyword, or no reply after a set number of hours. Your agent can set Spaces up itself. Paste "Set up Spaces for me by following https://www.spacesos.com/agents" into your agent. It signs you up with an emailed code, then sends you a link to connect each account.
How WhatsApp connects
Spaces connects the WhatsApp number you already use with a QR code, the way you link WhatsApp to a computer, and you can connect more than one number. There is no Meta approval, no message templates and no Meta message fees. Instagram, LinkedIn and Facebook connect through a secure sign-in link. If you need template broadcasts to large lists, tools on the official WhatsApp Business Platform are the better fit.
Limits that protect the account
Buffer's limits are API request limits per 15 minutes, 24 hours and 30 days, shared by all your API keys.
Spaces' limits protect the social account itself, because platforms watch automated messaging closely. Every plan includes per-channel daily limits, pacing and warm-up. 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. Keys can be read-only, and you can pause every send at once or require a person to approve replies. This lowers the risk of a platform restricting an account, but it can't remove that risk. How Spaces keeps accounts safe · Sending limits
Price
Buffer charges per channel. On monthly billing, Essentials is $6 and Team is $12 a channel for the first 10 channels, with lower rates after that. Yearly-billed rates are $5 and $10 a channel. Buffer's public pricing page shows the yearly view by default.
Spaces is free to start, then charges per connected chat account. The Free plan is $0 forever for 1 account and 50 actions a day, with no card. Pay as you go is $9 per connected account a month, prorated, with 1,000 actions a month per account pooled across the workspace, then $5 per 1,000 actions ($4 above 100,000 extra, $3 above 1,000,000). Reading messages is always free. Every plan includes the REST API and MCP server. No yearly option is listed.
If you only need to publish posts, Buffer Essentials costs less. At 5 accounts Spaces ($45) sits between Buffer Essentials ($30) and Buffer Team ($60), and its price covers an agent working inboxes every day.
Looking at other options too? See Buffer alternatives for AI agents.
FAQ
Is Spaces a Buffer replacement?
Only if your problem is conversations. If you mostly publish posts, keep Buffer. If your agent needs to answer customers, add Spaces, or use both.
Does Buffer have an API and an MCP server?
Yes. As of 11 November 2026, Buffer offers a GraphQL API at api.buffer.com and an MCP server on every plan, including Free. They cover posts, ideas, channels and organizations, and work with Claude, ChatGPT, Cursor and other AI tools.
Can Buffer answer Instagram DMs or WhatsApp messages?
On the Buffer pages we checked on 11 November 2026, Buffer's Community feature handles comments. DMs, WhatsApp and Messenger are not mentioned. Check Buffer's site for changes.
Which channels does Spaces support?
Instagram, WhatsApp, LinkedIn and Facebook Messenger are live for messages (the inbox). TikTok is live for posts and comments, not DMs. Facebook Pages is coming soon. Email and other legacy channels keep working for existing accounts, but they aren't listed on the pricing page.
How much does Buffer cost?
Buffer has a free plan for up to 3 channels. On monthly billing, Essentials is $6 a channel and Team is $12 a channel for the first 10 channels, with lower rates after that. Yearly-billed rates are $5 and $10 a channel. At 5 channels, that is $30 or $60 a month, or $25 or $50 a month billed yearly.
How much does Spaces cost?
Free to start: $0 for 1 account and 50 actions a day, no card. Then Pay as you go at $9 per connected account a month, with 1,000 actions a month per account, then $5 per 1,000. Reading messages is always free.
Does Spaces have a free plan?
Yes. The Free plan is $0 forever with no card: 1 connected account and 50 actions a day. An Instagram account on the official connection does not count toward the 1 account.
Why is Buffer Essentials cheaper?
Because it does a different job. Buffer publishes posts. Spaces gives an AI agent safe, rate-limited access to live customer conversations on chat accounts the business already has.
Will connecting an AI agent get my accounts restricted?
Every platform has its own automation rules. Spaces keeps each account inside daily limits, paces activity, and warms new accounts up over four weeks. This lowers the risk, but it can't remove it.
Facts about Buffer were checked on 11 November 2026 on Buffer pricing (pricing.md), Buffer API, Buffer MCP, Buffer Community and Buffer supported channels. Spaces facts come from spacesos.com/pricing, llms.txt and spacesos.com/whatsapp-api. Prices and features change, so check each site for the current version. Buffer is a trademark of its owner.