PostSider

PostSider is a social media publishing platform built for both humans and AI agents. It lets you schedule and publish content across more than 30 networks from a single calendar, or hand the keys to an AI agent that drafts, schedules and publishes on your behalf through MCP, a REST API or SDKs. The platform combines a drag-and-drop content calendar, a media library, analytics, team seats and approvals, agent access and automation in one place, so users do not have to juggle multiple tools to run their social presence. PostSider describes itself as being 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. The problem PostSider addresses is that publishing to social media usually means opening each network separately, or stitching together per-platform integrations in code. PostSider's own positioning is that scheduling and publishing across more than 30 networks happens from one calendar, and that connecting an agent requires no per-platform glue code; the site uses the phrases "no glue code" and "no per-platform glue code, ever." It frames the choice as four ways to publish: the dashboard, the API, the SDK and MCP. For teams used to per-channel billing, the FAQ contrasts PostSider's flat tiers with per-channel pricing, noting that adding another network costs nothing until you cross a tier, which it says is usually cheaper than per-channel pricing beyond four channels. For people working by hand, PostSider centres on a drag-and-drop calendar that the site describes as "a calendar you actually enjoy." Users plan a whole month at a glance, drag posts across days and channels, duplicate a post to another network, and let the queue publish. The listed capabilities include drag and drop across days and channels, composing once and tailoring per platform, a media library with live previews, and queues with best-time scheduling. A "this week" view shows slots such as Monday on X at 9:00, Tuesday on Instagram at 12:00 and Facebook at 17:00, Wednesday and Thursday on LinkedIn at 8:30 and Friday on YouTube at 15:00. For agents, PostSider provides what it calls an agent bridge built on MCP. The bridge exposes publishing and analytics as tools that any MCP agent can call, so an agent can draft, schedule and publish. The site lists Claude, ChatGPT/Codex, Gemini, Cursor, OpenClaw, Hermes Agent and "+ any MCP agent" as compatible. Alongside this, typed REST API clients and SDKs let developers call the platform directly from their own pipelines. The same secure authentication is used for humans and agents, and one integration is meant to cover every network. The site documents 60 API requests per minute. PostSider says it supports more than 30 networks and that new networks are added all the time. Named on the page are X, Instagram, Facebook, LinkedIn, Bluesky, Mastodon, Lemmy, Farcaster, Nostr, YouTube, TikTok, Twitch, Discord, Telegram, Slack, WordPress, Medium, Dev.to, Hashnode, Ghost, Blogger, Write.as, Notion, Mataroa, Listmonk, Pinterest, Dribbble, Google Business, Whop and Moltbook. The stated approach is to publish the same content everywhere or fine-tune per channel, with one payload going to every network and tailoring per platform applied automatically. Analytics track reach and performance across every channel in one view, with advanced analytics and automated queues and sets on higher plans. On security, PostSider says it treats access like infrastructure. Every channel token is encrypted at rest with AES-256-GCM, requests are hardened and validated against SSRF and CSRF, rate limiting provides abuse and overage protection, and tokens are isolated per channel with least-privilege access. The same hardened core is said to protect humans and agents alike. Getting started is described as a three-step process. 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 site promises you can be "live in minutes," whether you publish yourself or hand the work to an agent. The benefits the site claims follow directly from that structure: one calendar instead of many tools, four ways to publish (dashboard, API, SDK, MCP), a single integration covering every network rather than per-platform glue code, and the ability to publish yourself or let an agent take the wheel. For teams, unlimited team members on the Team plan and above, approval workflows and multi-user roles mean publishing can be shared and reviewed without leaving the platform. Because the same authentication serves humans and agents, an agent can take on the same work a person would do in the calendar. Concrete workflows are shown on the site. In one example, Claude, connected via PostSider MCP, is given a photo and the instruction "Create me a post for Instagram with this photo"; the agent replies that it drafted the post with the photo and queued it for Tuesday at 12:00. Another workflow is a creator planning a whole month at a glance, dragging posts between days and channels and letting queues publish. Agencies use approvals, seats and shared queues across many brands and channels. Developers call the typed REST API and SDKs from their own pipelines at a documented 60 requests per minute. And teams switching tools connect their channels to PostSider in parallel, rebuild their posting slots, bring their queue over manually or via CSV import, run both tools for one overlap week, then cancel the old one. PostSider states plainly who it is for: agentic builders and their AI agents; creators, including solo founders; and agencies running many brands and channels at once with approvals, seats and shared queues, plus everyone who wants to publish their content a different way. Plans start with a 7-day full trial and no credit card. Standard is $20/month for 1 seat, 5 channels and 400 posts per month; Team is $35/month for unlimited team members, 10 channels and unlimited posts; Pro is $45/month for 30 channels with an AI post checker and rewrite, auto-plugs and first comments, CSV bulk import, snippets and templates, webhooks, priority publishing and an audit log; Ultimate is $90/month for 100 channels, custom OAuth apps and priority support. Every plan includes the calendar, the agent bridge and the API. The site also addresses switching: users coming from Buffer or Hootsuite can connect channels to PostSider in parallel, rebuild posting slots, bring their queue over manually or via CSV import, run both tools for one overlap week and then cancel the old one. Alongside the product, PostSider publishes free browser tools, including best time to post, a hashtag counter, a bio link preview, an image size cheat sheet, an engagement rate calculator and a fancy text generator, plus a blog published weekly. PostSider is built by one person, Lukasz Blania, a solo founder building from Poland under Lumi Zone, and support emails land with the person who wrote the code. In short, PostSider is a social media scheduling platform where the calendar serves humans and the MCP server, REST API and SDKs serve agents. It covers 30+ networks from one calendar, adds analytics, approvals and team seats, encrypts channel tokens with AES-256-GCM, and uses flat monthly pricing rather than per-channel billing. Whether you plan to publish yourself or let an agent draft and queue the work, the promise is the same: run your social media on autopilot from one place.