Postkey vs Buffer
Postkey vs Buffer: the Buffer alternative with DM automation
Postkey is the most agentic DM automation tool. Buffer schedules your posts. Postkey schedules them too, then turns the comments they bring into DMs: comment to DM, follow to unlock, email capture and a DM inbox your AI assistant can run.
The short answer
Postkey is the most agentic DM automation tool: one MCP connection lets your AI assistant build and switch on DM automations, answer the inbox, and schedule posts to 10 networks, across every account on your plan. Buffer is a scheduler for 11 networks with a comments inbox and an MCP server for posts; we found no DM automation on its pages. Postkey schedules to 10 networks and answers what each post brings in.
Updated October 27, 2026 (Buffer's pages)
What an AI agent can do in each
Postkey is the most agentic DM automation tool: one MCP connection lets your AI assistant build and switch on DM automations, answer the inbox, and schedule posts to 10 networks, across every account on your plan. Here is the same list for Buffer, from its own pages on October 27, 2026.
| Buffer | Postkey | |
|---|---|---|
| MCP server | Yes, tools for posts, ideas, channels and metrics (Buffer gives no count) | Yes, up to 52 tools |
| Builds and switches on DM automations | No: we found no DM automation (searched October 27, 2026) | Yes, and switching on waits for your yes |
| Reads and answers the DM inbox | Not listed | Yes, each reply waits for your yes by default |
| Schedules and publishes posts | Yes, to Instagram, Facebook, LinkedIn, X, TikTok, YouTube Shorts, Threads, Bluesky, Pinterest, Mastodon and Google Business Profile | Yes, to Instagram, TikTok, Facebook, Telegram, LinkedIn, YouTube, Threads, Pinterest, Bluesky and Google Business |
| Accounts one connection reaches | The whole Buffer account | Every account on your plan, up to 15 |
| Plans that include it | Every plan, Free included | Every plan, inside the plan's limits |
| Sign-in | OAuth, or a personal API key | OAuth 2.1 with PKCE, or an agent key |
| In the official MCP Registry | Not found | Not yet |
"Not listed" and "None found" mean we could not find it on Buffer's own pages on October 27, 2026, not a statement by Buffer.
Sources: Buffer developers: MCP server
Why Postkey is the most agentic DM automation tool
Postkey's MCP server can build, edit and switch on automations. An agent can do the whole job:
- Build, edit and switch on DM automations: comment to DM, keyword DMs, follow to unlock, collecting emails.
- Read the inbox, draft replies and send them once you say yes.
- Write, schedule and publish posts, and set the DM keyword each post's comments reply to.
- Find and tag contacts, and report how posts and automations did.
- Up to 52 tools in one MCP server, with OAuth sign-in or an agent key, and a skill file that teaches the agent the rules.
- Approvals, limits and protection from instructions hidden in DMs built in, so you can let an agent run it.
Side by side
| Buffer | Postkey | |
|---|---|---|
| Comment to DM and keyword DMs | Not listed | Yes |
| Follow to unlock | Not listed | Yes |
| Collect emails in the DM | Not listed | Yes |
| Shared inbox | Yes (comments only, on 10 networks; DMs not listed) | Yes |
| AI replies | Yes (suggested comment replies that you send yourself) | From Create |
| DM channels | None found (searched October 27, 2026) | Instagram and Messenger |
| Post scheduler | Instagram, Facebook, LinkedIn, X, TikTok, YouTube Shorts, Threads, Bluesky, Pinterest, Mastodon and Google Business Profile | Instagram, TikTok, Facebook, Telegram, LinkedIn, YouTube, Threads, Pinterest, Bluesky and Google Business |
| Instagram accounts | "A channel is one social account you connect to Buffer: a single Instagram profile, Facebook page, LinkedIn page, TikTok account, and so on. You're billed per channel." | Up to 15 on one plan, sharing one contact allowance |
| How usage is billed | A price per connected channel, lower per channel past 10; yearly billing is 20% off. | Plans include contacts each month, shared by all the plan's accounts; extra contacts are charged, never cut off |
Buffer has a free plan (3 channels, 10 scheduled posts per channel at a time); paid plans have a 14-day trial, and yearly billing is 20% off. We found no DM automation on Buffer's pages.
Sources: buffer.com/pricing, buffer.com/community, buffer.com/mcp, Buffer developers: MCP server, Buffer help: automation tools and AI assistants, Buffer help: Buffer's API, Buffer help: Facebook and Instagram comments
What Postkey does after the post goes out
- Comment to DM: everyone who comments your keyword gets the link by DM, with a public reply.
- Follow to unlock and email capture inside the DM.
- A shared inbox for Instagram and Messenger DMs, with AI replies from Create.
- The post and its keyword are scheduled together, so the DMs start when the post goes live.
What each costs
Buffer's list prices in US dollars, as its pricing page showed them on October 27, 2026, then Postkey's in US dollars. Monthly billing unless it says yearly.
| Plan | A month | Billed yearly | Accounts | Limit |
|---|---|---|---|---|
| Buffer Free | $0 | Not shown | 3 | Up to 3 channels, 10 scheduled posts per channel at a time, 1 user |
| Buffer Essentials | $6 | $60 a year | 1 | Priced per channel: the price shown is for one channel; channels 11 to 25 cost less each. 1 user |
| Buffer Team | $12 | $120 a year | 1 | Priced per channel: the price shown is for one channel. Unlimited users, approval workflows |
| Postkey Free | $0 | Free | 2 | 25 contacts a month |
| Postkey Essential | $15 | $144 a year | 2 | 250 contacts a month |
| Postkey Create | $34 | $300 a year | 5 | 2,500 contacts a month, Postkey AI |
| Postkey Pro | $85 | $708 a year | 10 | 7,500 contacts a month, Postkey AI |
| Postkey Advanced | $175 | $1428 a year | 15 | 25,000 contacts a month, Postkey AI |
List prices before tax. Plans change; check each pricing page before you buy.
Sources: buffer.com/pricing
Where Buffer is a good fit
- A free plan with 3 channels, and a low price per channel on paid plans.
- Publishes to 11 networks, Bluesky, Mastodon and Google Business Profile among them.
- A comments inbox across 10 networks, with suggested replies and saved replies.
- An MCP server on every plan, Free included, plus a public API and Zapier, Make and n8n.
Where Postkey is the better fit
- You want comments on your posts to turn into DMs with your link, automatically.
- You want to collect emails or ask for a follow inside the DM.
- You want one inbox for Instagram and Messenger DMs, not comments only.
- You want your AI assistant to build DM automations, not only schedule posts.
Switching from Buffer
- 01
Connect your accounts to Postkey with each network's own sign-in.
- 02
Move your scheduled posts: ask your assistant to recreate them in Postkey, or add them to your posting schedule yourself.
- 03
Add a comment keyword and a link to the posts that should send a DM, and switch on the automation with the post.
Questions
We found none on Buffer's pages (searched October 27, 2026): no comment to DM, follow gate or email capture. Its inbox covers comments. Postkey automates Instagram and Messenger DMs.
Yes, on every plan, Free included. By Buffer's developer docs its tools cover posts, ideas, channels and metrics; we found none that reads or answers comments or DMs.
For scheduling alone, often yes: Buffer has a free plan and a low price per channel. Postkey costs more for some setups and adds DM automation, a DM inbox and AI replies.
Not yet. Buffer posts there; Postkey schedules to Instagram, TikTok, Facebook, Telegram, LinkedIn, YouTube, Threads, Pinterest, Bluesky and Google Business.
Yes. Postkey's Free plan has 25 contacts a month and 5 scheduled posts a week, and paid plans start with a free trial.