PostSider
PostSider · Productivity · Marketing · Business
PostSider is a social media scheduling tool built for two kinds of users: people who want a calm calendar and AI agents that need an API to publish. You connect 30+ networks once, then compose posts by hand or let an AI agent draft and queue them. The same account handles cross-platform publishing through a dashboard, a REST API, SDKs, or an MCP server, so you don't wire up a separate schedule for every network. It starts with a 7-day free trial and no credit card.
About PostSider
What Is PostSider
PostSider is a social media scheduling platform from a small independent team led by Łukasz Blania, built first as an internal tool and then released publicly. It does the usual job of a scheduler, planning posts on a calendar and publishing them at set times, but the twist is who can drive it. That part is unusual. Alongside the drag-and-drop calendar, PostSider exposes publishing and analytics as tools any Model Context Protocol (MCP) agent can call. That means an AI agent can handle social media drafts, fill a queue, and publish without you touching a dashboard. If you want AI agent social media workflows, this is the point of the product.
The calendar itself covers the basics well. You plan a month at a glance, drag posts between days and channels, duplicate a post to another network, and compose once while tailoring the copy per platform. A media library and live previews round it out. It's clean. For developers and agent builders, the bigger draw is the single integration: one payload reaches every network, with a typed REST API, official SDKs, and webhooks layered on top. If scheduling posts across platforms is the job, PostSider tries to cover the whole loop in one place.
The main catch is that it isn't a media powerhouse. There's no built-in image editor or video production suite, so you'll still make your assets elsewhere and bring them in. Publishing also depends on each network's own approval process, so new networks arrive as those reviews clear. PostSider is aimed at solo creators, small brands, and agencies, plus the growing group of developers who want their agents to publish directly.
Getting Started
- Sign up at app.postsider.com. Every plan includes a 7-day free trial, and no credit card is required to start.
- Connect your channels. Link the networks you want to publish to; each channel token is encrypted at rest with AES-256-GCM.
- Compose a post. Write it yourself in the editor, or connect an MCP agent and let it draft the copy and media for you.
- Schedule it. Drag the post to a slot on the calendar, duplicate it to another network, or hand it to a queue that publishes at the best time.
- Watch it go out and check analytics. Publishing runs on autopilot, and reach and performance appear in one view across every channel.
Product Information
A quick look at PostSider's pricing, supported platforms, and performance.
Best for
The users, tasks, and scenarios where this tool fits best.
Users
- Solo creators and founders
- Small brand teams
- Agencies and managers
- Developers and agent builders
Tasks
- Scheduling posts across platforms
- Letting an AI agent draft and publish
- Running approval workflows
- Bulk importing and recycling content
- Tracking reach in one place
Scenarios
- Planning a month of content in one sitting
- Launching a product across many networks at once
- Handing routine posting to an agent
- Managing several client accounts
Key features
Drag-and-drop calendar
The calendar is the center of the product. You plan weeks ahead, drag a post to a new day or channel, and duplicate it when the same idea works on more than one network. Queues then publish at the times you set or at whatever slot the tool marks as best. Need the whole month visible at once? That's the idea. It keeps the plan readable, and it handles the timing so you don't have to.
Agent bridge over MCP
PostSider exposes scheduling, publishing, and analytics as tools any MCP agent can call. For MCP social media workflows, builders connect an agent in one step and let it draft posts, fill a queue, and publish, with the same secure auth the human dashboard uses. This is the feature most scheduling tools don't have.
REST API, SDKs, and webhooks
Beyond agents, PostSider ships a typed REST API and official SDKs for your own pipelines. The documented limit is 60 API requests per minute, and webhooks fire on publishing events. One integration covers every network, so you don't build a separate connector per platform.
30+ platform coverage
One payload reaches more than 30 networks, including X, Instagram, TikTok, YouTube, LinkedIn, Facebook, Pinterest, Discord, Telegram, Mastodon, and Bluesky. PostSider says it tailors the post per platform automatically, so length and format adjust without extra work.
Queues and best-time scheduling
Automated queues and sets keep a steady posting cadence without manual scheduling. You drop posts into a queue and let it handle timing, or pin specific slots when a launch needs an exact moment.
Teams, approvals, and roles
From the Team plan up, accounts get unlimited members, approval workflows, and multi-user roles. Drafts can wait for a manager's sign-off before they publish, which keeps a shared account from going off-message.
Security and encrypted tokens
Every channel token is encrypted at rest with AES-256-GCM, and PostSider adds SSRF and CSRF protection on top. Access is scoped per channel, so a compromise on one network doesn't expose the rest.
Pros and cons
Pros
- Combines a human calendar and an agent-first API in one product, which is rare among social media schedulers.
- One integration covers 30+ networks through the dashboard, REST API, SDKs, or MCP, cutting per-platform glue code.
- The 7-day trial needs no credit card, so you can test the whole loop before paying.
- Plans scale cleanly from a single creator at $20/mo to an agency at $90/mo, gated mainly on posts, channels, and seats.
- Token encryption and SSRF/CSRF protection are built in rather than sold as add-ons.
Cons
- There's no free plan. You get a 7-day trial, then the cheapest tier is $20/mo, which is more than free-for-one-channel schedulers.
- No built-in image or video editor, so you still produce assets in another tool before uploading.
- Publishing depends on each network's approval process, which means new platforms arrive only as those reviews clear, and some networks can lag.
- It's run by a single founder, so support and roadmap speed rest on one person, which matters if you need an SLA.
Frequently asked questions
PostSider schedules and publishes social media posts across more than 30 networks from one account. You can run it by hand through a calendar, or let an AI agent draft and publish through its MCP and REST interfaces.
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