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PostZen

The Buffer Alternative for API-first products

Buffer offers a public GraphQL API for Buffer account workflows. PostZen gives product teams a REST publishing API for their own app, AI agent, or automation system.

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// Simple API key authentication
fetch('https://api.postzen.dev/v1/posts', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer POSTZEN_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    platforms: ['instagram', 'twitter', 'linkedin'],
    content: 'Hello world!'
  })
})

Buffer's API follows Buffer's workspace model.

Buffer is a strong social media workspace. Its API follows Buffer accounts, organizations, channels, ideas, and queues. PostZen follows the publishing workflow inside your product.

This comparison looks at API model, pricing unit, and who owns the publishing workflow.

API FIT

Where PostZen and Buffer differ

PostZen

PostZen

  • One REST API for posting and scheduling across Instagram, X, LinkedIn, Facebook, Threads, YouTube, TikTok, Pinterest, and Bluesky.
  • Hosted account connection flow through /v1/connect/{platform}, plus account and profile APIs.
  • Media upload support through /v1/media/presign before creating posts.
  • API keys, platform targets, custom platform content, drafts, publish-now, and scheduled post modes.
  • Node and Python SDKs, a postzen CLI, and an MCP server for AI agents — all generated from the same OpenAPI spec.
  • Connected-account pricing: first 2 accounts are free, then $6/account for accounts 3-10, $3/account for 11-100, and $1/account for 101-2,000.
Buffer logo

Buffer

  • Free plan includes 3 channels, 10 scheduled posts per channel, 1 API key, and 3,000 API requests per month.
  • Essentials starts at $5/channel/month when billed yearly; Team starts at $10/channel/month when billed yearly.
  • API access is available on current plans, with 15-minute, 24-hour, and 30-day request limits by plan.
  • GraphQL API centers on Buffer organizations, channels, posts, ideas, and queues.
  • Strong fit when users already manage content inside Buffer.

FEATURE COMPARISON

PostZen vs Buffer

Feature comparison between PostZen and Buffer
FeaturePostZenBuffer
Primary fitEmbed publishing in your app or agent workflowAutomate a Buffer account and Buffer queue
Starting priceFirst 2 connected accounts free; then $6/account for accounts 3-10, $3/account for 11-100, and $1/account for 101-2,000.Free plan available; Essentials starts at $5/channel/month billed yearly
Free tier2 connected accounts free, API included3 channels and 10 scheduled posts per channel
API accessREST API included with PostZen account pricingIncluded on current Buffer plans, including Free
API limitsCheck current PostZen docs and account settings for active API limits100 requests/15 min; 100, 250, or 500 requests/day by plan
Pricing unitConnected social accountChannel
Media flowPresign and upload media, then attach media URLs to /v1/postsBuilt around Buffer publishing objects and queues
Best for usersUsers publish through your product UIUsers already work in Buffer
Best forSaaS, AI, and automation buildersTeams that want Buffer as the publishing workspace

WHY POSTZEN

Built for product teams, not only social teams

PostZen keeps the publishing layer small and direct: connect accounts, upload media, create posts, and schedule across supported networks.

One request shape

Use the same /v1/posts structure across PostZen-supported platforms, with per-platform overrides only where needed.

Your interface stays yours

Keep review flows, AI prompts, templates, approval states, and billing inside your own product.

Clear API scope

Posts, accounts, profiles, connect, and media APIs are the core public surface.

WHICH ONE?

Choose based on the workflow you are building.

Choose PostZen if you:

  • You are building social publishing into a SaaS, AI agent, internal tool, or automation product.
  • You want REST endpoints and platform targets instead of a GraphQL Buffer object model.
  • You want a pricing model based on connected accounts, starting with two free accounts.
  • You need to keep users inside your own product experience.

Choose Buffer if you:

  • Your team already uses Buffer as the main content calendar.
  • You want to automate Buffer queues, ideas, channels, and organization data.
  • You prefer Buffer-owned publishing workflows and plan-based API limits.

Need embedded publishing instead of Buffer automation?

Start with PostZen if the publishing workflow belongs inside your product and your API should call platform account targets.

COMMON QUESTIONS

Does Buffer have a public API?
Yes. Buffer describes its API as a public GraphQL interface for Buffer account workflows. PostZen exposes REST publishing endpoints for product teams embedding social posting.
Can PostZen replace Buffer?
PostZen can replace Buffer for API-led publishing and scheduling workflows. Buffer's calendar, inbox, and content workspace remain outside PostZen's scope.
Why choose PostZen over Buffer for a SaaS product?
Choose PostZen when your users should publish from your UI and your backend needs simple REST calls for connect, media, and posts.
Which platforms does PostZen support?
PostZen supports Instagram, X, LinkedIn, Facebook, Threads, YouTube, TikTok, Pinterest, Bluesky for public marketing workflows.

READY TO BUILD

Ready for a real API?

Start with the free plan. No credit card required. See why developers choose PostZen.

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