PostSider

PostSider is a social media publishing platform built for both humans and AI agents. From a single calendar you can schedule and publish content across more than 30 networks, or you can hand the keys to an AI agent that drafts, schedules and publishes through MCP, a REST API or SDKs. The site names three groups it is amazing for: agentic builders and their AI agents, solo founders and creators, and agencies running many brands and channels at once — plus "everyone who wants to publish their content a different way." Its stated purpose is to cover the whole publishing loop in one place: content calendar, analytics, teams, approvals and automation, without juggling multiple tools. The problem PostSider addresses is fragmentation. Publishing to many networks typically means separate tools for scheduling, drafting and reporting, and for developers it means writing per-platform glue code for every network they want to reach. PostSider's answer is one place to manage everything, with four documented ways to publish: the dashboard, the API, the SDKs and MCP. The product also positions itself against per-channel billing, stating that it uses flat tiers rather than charging per channel, and it explicitly targets people switching from Buffer or Hootsuite with comparison articles and a step-by-step migration checklist that is described as not dropping a single scheduled post. The claim running through the site is straightforward: one integration, every network, for humans and agents alike. For humans, PostSider presents "a calendar you actually enjoy." You plan your whole month at a glance, drag a post to a new slot, duplicate it to another network, and watch the queue handle the rest. The listed calendar capabilities include drag-and-drop posts across days and channels, composing once and tailoring per platform, a media library with live previews, and queues with best-time scheduling. The composer lets you start writing or try a sample post, and accepts files by drag and drop or a file selector. The site shows a worked example on the calendar: a Claude agent connected via PostSider MCP is asked to create an Instagram post from an attached photo, and it drafts the post and queues it for Tuesday at 12:00. For AI agents, PostSider provides what it calls an agent bridge. Scheduling, publishing and analytics are exposed as tools through a Model Context Protocol (MCP) server, so any MCP agent can call them. The site displays Claude, ChatGPT / Codex, Gemini, Cursor, OpenClaw and Hermes Agent, plus "any MCP agent." Alternatively, developers can call the typed REST API and SDKs directly for their own pipelines. PostSider states this removes per-platform glue code entirely — one integration covers every network — and that the same secure auth is used for humans and agents. The documented API rate is 60 requests per minute, and the site links to its own docs for developers. The described agent workflow is that an agent can draft posts and fill the queue, just as a human would from the dashboard. Publishing reach, measurement and security are the remaining pillars. PostSider says it supports more than 30 networks, listing X, Instagram, Facebook, LinkedIn, TikTok, YouTube, Pinterest, Bluesky, Mastodon, Discord, Telegram, Slack, Google Business, Twitch, WordPress, Medium, Dev.to, Nostr, Dribbble, Lemmy, Farcaster, Hashnode, Ghost, Blogger, Write.as, Notion, Mataroa, Listmonk, Whop and Moltbook, with new networks added all the time. The claim behind this is that you can publish the same content everywhere or fine-tune per channel, with one payload tailored per platform automatically. Analytics track reach and performance across every channel in one view. On security, PostSider says it treats access like infrastructure: every channel token is encrypted with AES-256-GCM, requests are hardened against SSRF and CSRF, rate limiting protects against abuse and overage, and tokens are isolated per channel with least-privilege access. Getting started is described in three steps. First, connect your channels: link 30+ networks in a click, with tokens encrypted and isolated per channel. Second, create it yourself or let your agent: compose in the editor, or let your MCP agent draft posts and fill the queue. Third, schedule and publish on autopilot: pick times or use best-time queues, and PostSider publishes everywhere for you. The marketing promise that wraps this is being "live in minutes" — yours or your agent's — and the headline call to action is to publish it yourself or let your AI agent take the wheel. The benefits stated for users follow directly from that structure. Teams get one screen for the whole plan instead of several scheduling tools, because the calendar, queues, media library and analytics live together. Builders get one integration instead of per-platform glue code, exposed through MCP, REST and SDKs. Agencies get approvals, seats and shared queues so multiple brands and channels can be coordinated in one place. PostSider also argues on price structure: flat tiers rather than per-channel billing mean adding another network costs nothing until you cross a tier, which the site says is usually cheaper than per-channel pricing beyond four channels. The content points to several concrete scenarios. A solo founder or creator maps out a month of posts on the calendar, drags them between days and channels, and lets best-time queues publish. An agency runs many brands at once, using approval workflows and multi-user roles so drafts are reviewed before they go out, with separate queues and channels per client. An agentic builder connects an MCP agent such as Claude or Cursor, asks it to draft a post from a photo, and the agent queues it through PostSider rather than through custom code. A team switching from Buffer or Hootsuite connects channels in parallel, rebuilds posting slots, imports the queue manually or via CSV, runs both tools for one overlap week, then cancels the old tool. And a marketing team watches reach and performance across every channel from a single analytics view. Plan details are published on the site. Every plan includes the calendar, the agent bridge and the API; accounts are only gated on posts, channels and seats. Standard at $20/mo is aimed at content creators with 1 seat, 5 channels and 400 posts per month. Team at $35/mo for small brands adds unlimited team members, 10 channels, unlimited posts, an AI post checker and rewrite, automated queues and sets, advanced analytics, approval workflows and multi-user roles. Pro at $45/mo for large businesses adds 30 channels, auto-plugs and first comments, CSV bulk import, snippets and templates, SDK access with webhooks, priority publishing and an audit log. Ultimate at $90/mo for agencies adds 100 channels, custom OAuth app building and priority support. A 7-day full trial is offered with no credit card required, plans are month to month, and the trial covers the calendar, composer, agent bridge and API. The AI features are an AI post checker and per-network caption rewrite, usable with the built-in AI or your own OpenAI API key, and the site stresses there is no auto-generated content spam — the AI checks and refines what you or your agent drafted. PostSider also offers six free browser tools with no account, including best time to post, a hashtag counter, a bio link preview, an image size cheat sheet, an engagement calculator and a fancy text generator, plus a blog publishing research and playbooks. The product is built by one person, Lukasz Blania, a solo founder building from Poland under Lumi Zone. In summary, PostSider's primary value proposition is a single social media scheduling and publishing platform that serves both human teams and AI agents: one calendar for planning, 30+ networks for reach, four ways to publish through dashboard, API, SDK and MCP, and hardened per-channel security — with no per-platform glue code and flat-tier pricing.