The Postiz Alternative That Answers Comments and DMs
Postiz is a good open-source scheduler: a calendar, about 32 platforms, and a REST API, a 13-tool hosted MCP server and a CLI on every paid plan. Its API and MCP stop once the post is live, with no comment, DM, mention or review resource. SocialAPI.ai reads and answers all four through one REST API and 90+ MCP tools.
- Free tier available
- Instant API key
- No approval process
By Erwan Prost, FounderUpdated
At a glance: Postiz vs SocialAPI.ai, the differences that matter.
- Comments, DMs, mentions, reviews by API
- Postiz: None (comment replies in the Postiz UI)
- SocialAPI.ai: Yes, all four, REST and MCP
- Webhook events
- Postiz: Publish success only, no documented signature
- SocialAPI.ai: Signed; post.failed, inbox events
- Hosted MCP server
- Postiz: 13 tools, API key or OAuth
- SocialAPI.ai: 90+ tools, OAuth
- Publishing platforms
- Postiz: About 32, incl. Reddit, Discord, Mastodon
- SocialAPI.ai: 11 of 13
- Billing unit
- Postiz: Per connected channel
- SocialAPI.ai: Social profile, every network included
- Open source, self-host
- Postiz: Yes, AGPL-3.0, Docker
- SocialAPI.ai: Not offered
TL;DR SocialAPI.ai is the Postiz alternative for products and agents that must answer what comes back. Postiz's API and 13-tool MCP server publish and schedule, but have no comment, DM, mention or review endpoint, and its one webhook fires on publish success. We cover all four and sign failure events. For 30+ platforms or self-hosting, Postiz fits better.
The honest answer, before we get into specifics about Postiz.
Positioning: What Postiz does, and what we do differently.
What Postiz does
Postiz is an open-source social media scheduler, licensed AGPL-3.0, with a calendar UI, team members, threaded team comments on post previews and AI image and video generation. It publishes to about 32 platforms, including Reddit, Discord, Slack, Mastodon, Farcaster, Medium, Dev.to, WordPress and Telegram next to the big networks. Every paid Cloud plan includes the public REST API, a hosted MCP server with 13 tools (API key or OAuth), the postiz CLI and publish webhooks. Postiz Cloud is $29/mo for 5 channels (Standard), $39 for 10 with unlimited team members (Team), $49 for 30 (Pro) and $99 for 100 (Ultimate), from $23/mo billed annually, with unlimited posts on every tier. There is no free Cloud tier, only a 7-day trial, and self-hosting on Docker is free, with no feature split between Cloud and self-host.
What SocialAPI.ai does
SocialAPI.ai is a unified REST API for the conversation side of social media: comments on 8 platforms, DMs sent and received on 7 (Instagram, Messenger, WhatsApp, X, Bluesky, Telegram, Zalo), mentions on 7 and Google Business Profile reviews, plus publishing to 11 of its 13 platforms. Webhooks are signed, retried and logged: post.published, post.partial and post.failed, with post and account events on all 13, and comment, DM, mention and review events pushed from Instagram, Facebook, Threads, WhatsApp, Telegram, Zalo and Google. A hosted MCP server with 90+ tools and OAuth 2.1 gives agents the same calls. The billing unit is the social profile, one brand holding at most one account on each network: Hobby is free for 2, then $29, $109 and $349 a month for 10, 50 and 200, with posts and interactions uncapped on every paid plan.
The catch: The replies come back through the API, not a UI
Postiz's OpenAPI spec, dated 2026-10-07, has no comment, DM, mention or review resource, and its MCP docs answer “Can MCP read or reply to comments?” with “Not today”: comment replies must be triggered through the Postiz UI. Its one webhook fires when a post publishes, with no failure event and no documented signature, and its docs tell you to learn the payload by sending a test. SocialAPI.ai reads and answers comments on 8 platforms, DMs on 7, mentions on 7 and Google reviews through the same REST API and MCP server, and signs every webhook, post.failed and post.partial included. If your product only publishes, Postiz covers more networks, can be self-hosted and has a calendar your team will like. If it has to answer people, this is the whole comparison.
Feature matrix: Postiz vs SocialAPI.ai, feature by feature.
| Feature | Postiz | SocialAPI.ai |
|---|---|---|
| Publishing | ||
| Publish & schedule posts | PostizYes | SocialAPI.aiYes |
| Publishing platforms | PostizAbout 32, incl. Reddit, Discord, Mastodon, WordPress | SocialAPI.ai11 of 13 |
| WhatsApp and Zalo | PostizNot listed | SocialAPI.aiYes, DMs on both, posts on Zalo |
| Telegram | PostizPublishing through the Bot API | SocialAPI.aiDMs (send + receive) |
| Calendar UI and team members | PostizYes, unlimited members from Team ($39/mo) | SocialAPI.aiNot offered, API only |
| AI image and video generation | PostizYes, image, video, clipping | SocialAPI.aiNot offered, bring your own model |
| Engagement | ||
| Comments (read + reply) | PostizPostiz UI only, no API or MCP | SocialAPI.aiYes, 8 platforms |
| Direct messages (send + receive) | PostizNot offered, no API or MCP endpoint | SocialAPI.aiYes, 7 platforms |
| Mentions | PostizNot offered | SocialAPI.aiYes, 7 platforms, reply on 4 |
| Google Business Profile reviews | PostizPosts only, no reviews | SocialAPI.aiYes, list, read, reply |
| Inbox webhooks | PostizNot offered | SocialAPI.aiYes, comment, DM, mention, review events from 7 networks |
| Developer experience | ||
| Public REST API | PostizYes, every paid plan and self-host | SocialAPI.aiYes, every plan, incl. free Hobby |
| Post webhook events | PostizPublish success only | SocialAPI.aipost.published, post.partial, post.failed |
| Webhook signature | PostizNot documented | SocialAPI.aiYes, X-SocialAPI-Signature |
| Webhook payload contract | PostizLearned by sending a test | SocialAPI.aiDocumented { event, data } envelope |
| Analytics by API | PostizYes, platform and post | SocialAPI.aiYes, account, brand and post |
| Open source, self-host | PostizYes, AGPL-3.0, Docker | SocialAPI.aiNot offered |
| Pricing | ||
| Billing unit | PostizPer channel (connected account) | SocialAPI.aiSocial profile: one brand, one account per network |
| Free plan | PostizNo free Cloud tier, 7-day trial | SocialAPI.aiHobby: 2 profiles, 10 posts + 50 interactions/mo |
| Entry paid plan | Postiz$29/mo, 5 channels | SocialAPI.ai$29/mo, 10 profiles |
| Volume on paid plans | PostizYes, unlimited posts | SocialAPI.aiYes, posts and interactions uncapped |
| Past 100 accounts | PostizEnterprise only, closed to new applications | SocialAPI.aiSelf-serve to 200 profiles ($349/mo) |
| AI agents | ||
| Hosted MCP server | PostizYes, 13 tools, API key or OAuth | SocialAPI.aiYes, 90+ tools, OAuth 2.1 |
| Agent replies to comments, DMs, reviews | PostizNot offered, read-only on channels, write-only on posts and media | SocialAPI.aiYes, all three, plus mentions |
| Agent learns a post failed | PostizNot offered, success event only | SocialAPI.aiYes, post.failed webhook |
| Image and video generation tools | PostizYes, generateImageTool, generateVideoTool, clippingTool | SocialAPI.aiNot offered |
Show, don't tell: Simple by design.
Postiz# Postiz's public API covers channels, posts, media and analytics.
curl -H "Authorization: your-api-key" \
https://api.postiz.com/public/v1/integrations
# Its OpenAPI spec (2026-10-07) has no comment, DM, mention or
# review resource, and its MCP docs say comment replies "must be
# triggered through the Postiz UI".# Read the comments on a post (reads are never metered)...
curl "https://api.social-api.ai/v1/inbox/comments/{postId}?account_id=acc_xxx" \
-H "Authorization: Bearer sapi_key_..."
# ...and answer one. DMs, mentions and Google reviews work the same way.
curl -X POST "https://api.social-api.ai/v1/inbox/comments/{postId}" \
-H "Authorization: Bearer sapi_key_..." \
-H "Content-Type: application/json" \
-d '{"account_id": "acc_xxx", "comment_id": "sapi_cmt_...", "text": "Thanks! Your order ships Monday."}'The same job: answer a comment on a post you published. Postiz's API and its 13 MCP tools stop once the post is live. On SocialAPI.ai the read is free and the reply is one call, on 8 platforms.
Pricing: Postiz pricing, and what you actually pay at scale.
| Size | Postiz | SocialAPI.ai |
|---|---|---|
| 1 brand on 10 networks | Postiz$39/moTeam, 10 channels | SocialAPI.ai$29/moSide Hustle |
| 10 brands on 5 networks each | Postiz$99/moUltimate, 50 channels | SocialAPI.ai$29/moSide Hustle |
| 100 accounts, one network each | Postiz$99/moUltimate | SocialAPI.ai$349/moEmpire |
Postiz bills each connected account and we bill the brand with every network included: up to 10 brands we cost the same or less on any number of networks, from 11 brands Postiz costs less while the total stays at or under 100 channels ($99 for 20 brands on 5 networks against our $109), and past 100 channels its Enterprise tiers are closed to new applications.
Decision guide: Is Postiz or SocialAPI.ai right for you?
- Pick Postiz
Self-hosting the whole stack on your own servers
Postiz is AGPL-3.0 open source, runs on Docker, and has no feature split between Cloud and self-host, so the software costs nothing. You register your own developer app on every platform and pay for X's API yourself, but we offer no self-hosted option at all.
- Pick Postiz
Publishing to Reddit, Discord, Mastodon, Medium or WordPress
Postiz publishes to about 32 platforms, 21 of which we do not touch, including Reddit, Discord, Slack, Mastodon, Farcaster, Medium, Dev.to and WordPress. It also posts to Telegram, where our connector does DMs only.
- Pick Postiz
A content team planning posts on a shared calendar
Postiz has a calendar, unlimited team members from the $39 Team plan, threaded team comments on post previews and 100 to 500 AI image credits a month. We have no calendar UI, no approval flow and no content generation.
- Pick Postiz
Publishing only, for many accounts on one network each
When every account is its own brand, Postiz's per-channel price wins: 30 accounts for $49 and 100 for $99, against our $109 and $349. If nothing ever needs a reply, you do not need what we add.
- Pick SocialAPI.ai
An AI agent that posts, then answers the comments, DMs and reviews
Postiz's 13 MCP tools are read-only on channels and write-only on posts and media, and its docs say comment replies go through the Postiz UI. Our 90+ tools read and answer comments on 8 platforms, DMs on 7, mentions on 7 and Google reviews, with OAuth.
- Pick SocialAPI.ai
An agency or SaaS product posting for 10 to 50 brands on several networks
10 brands on 5 networks each is $29/mo here against $99 on Postiz Ultimate, and 50 brands on 10 networks is $109 here, where Postiz's next step past 100 channels is closed to new applications. A signed post.failed webhook tells your backend which brand's post did not go out.
Migration: Moving from Postiz, step by step.
- 01
Start on the free plan
Sign up for Hobby, free for 2 social profiles with no card, and create one profile per brand. Each profile holds one account on each network, so a brand's Postiz channels collapse into one profile.
- 02
Reconnect each account through OAuth
Platform tokens do not move between vendors, so each account owner signs in once. Start each connection with POST /v1/accounts/connect and keep Postiz live until the brand is fully connected.
- 03
Swap POST /public/v1/posts for POST /v1/posts
Name each destination in targets, pass media by URL and schedule with scheduled_at on the same request. Your Postiz integration ids become SocialAPI.ai account ids.
- 04
Subscribe one webhook for posts and the inbox
Register POST /v1/webhooks with post.published, post.failed, comment.received and dm.received, verify the signature header, then retire the handler built from a captured Send Test body.
FAQ: Postiz questions, answered honestly.
What is the best Postiz alternative?
It depends on whether you publish or converse. For publishing only, Postiz is hard to beat on breadth and freedom: about 32 platforms, a calendar, and free self-hosting under AGPL-3.0. If your product or agent has to answer people, SocialAPI.ai is the alternative: comments on 8 platforms, DMs on 7, mentions on 7 and Google reviews through REST and 90+ MCP tools, plus signed post.failed webhooks.
Postiz vs SocialAPI.ai: what is the difference?
Postiz is a scheduler with an API: a calendar UI, team members, AI image and video generation, and a REST API, 13-tool MCP server and CLI that publish and schedule posts, list channels and read analytics. SocialAPI.ai is an API with no UI to plan in, built for what comes back: comments, DMs, mentions and Google reviews read and answered through the same key, and webhooks for failures and new messages. Both offer a hosted MCP server with OAuth.
How much does Postiz cost?
Postiz Cloud is $29/mo for 5 channels (Standard), $39 for 10 (Team), $49 for 30 (Pro) and $99 for 100 (Ultimate), or $23 to $79/mo billed annually, with unlimited posts and the API, MCP and CLI on every plan. There is no free Cloud tier, only a 7-day trial, and self-hosting the AGPL-3.0 code is free. SocialAPI.ai is free for 2 social profiles, then $29, $109 and $349 a month for 10, 50 and 200, each holding one account on every network. Up to 10 brands cost the same or less here; from 11 brands, Postiz costs less while the total stays at or under 100 channels.
Can the Postiz API or MCP reply to comments and DMs?
No. Postiz's OpenAPI spec, dated 2026-10-07, has no comment, DM, mention or review resource, and its MCP docs answer “Can MCP read or reply to comments?” with “Not today”, adding that comment replies must be triggered through the Postiz UI. Its Google provider posts content and does not read or reply to reviews. SocialAPI.ai exposes all four through REST and MCP, and only replies and sent DMs count toward a plan limit; reads never do.
Does Postiz have webhooks?
Yes, one event: a callback when a post publishes, scoped to all channels or a chosen set, with 2 webhooks on Standard up to 10,000 on Ultimate. There is no failure event, no documented signing secret, and the docs say to capture a Send Test body as the payload contract. SocialAPI.ai signs every delivery, retries and logs it, and sends post.published, post.partial and post.failed, plus comment, DM, mention and review events from Instagram, Facebook, Threads, WhatsApp, Telegram, Zalo and Google.
What is the Postiz API rate limit?
Postiz's docs give three figures: 30 requests an hour in the OpenAPI spec, 90 an hour self-hosted and 100 on Cloud for creating posts in the API introduction, and 90 an hour on the Cloud limits page. None scales with the plan, one request can carry several posts, and self-hosters set their own with API_LIMIT. On SocialAPI.ai reads are never metered, and posts, replies and DMs are uncapped on every paid plan.
Keep comparing:
Each one argued the same way: what it does, what it costs at scale, where it wins.
A strong publishing API on 22 platforms, with DMs documented for Instagram only and comment webhooks from 3 networks
Per-account billing across 16 connectors, so the invoice grows with every page you connect
Publishing-first API with expensive per-profile pricing at scale
Scheduling dashboard with a publishing-only API and MCP server, no inbox API
- All alternatives
Ready to unify your social interactions?
Free tier available. No credit card required. Ships with the MCP server.