Zernio vs bundle.social: the facts side by side, and a third option

Both are APIs that publish to several social networks. Here is what each one bills, what it costs for an agency, its free plan, MCP server and refund — each cell read on the vendor's own page, with the link and the date — next to PostWire, which also writes each network's post.

Short answer. For 10 clients on 5 networks: Zernio $168 — per account, bundle.social $100 — Pro, PostWire $29 (Pro). PostWire is priced per business, has a free plan with the API and the MCP server, and writes a native post for each network from one idea.
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Zernio read on Oct 9, 2026, bundle.social on Oct 9, 2026. If they changed since, their pages win.

Zernio, bundle.social and PostWire

Zerniobundle.socialPostWire
What you pay forConnected social account — one profile on one platformzernio.com, Oct 9, 2026Posts a month, per organization; unlimited social accounts on paid plansbundle.social, Oct 9, 2026One business (brand) — every network of that business included
Cheapest paid plan$6 per account a month, after the first 2 freezernio.com, Oct 9, 2026$100 a month (Pro, 10,000 posts)bundle.social, Oct 9, 2026$9 a month (Starter, 3 businesses)
Free planYes — the first 2 accounts, no cardzernio.com, Oct 9, 2026Yes — 20 posts a month, 3 social accounts, API includedbundle.social, Oct 9, 2026Yes — 1 business, 20 posts a month, the REST API and the MCP server, no card
10 clients × 5 networks, a month$168 — per accountzernio.com, Oct 9, 2026$100 — Probundle.social, Oct 9, 2026$29 — Pro
Writes a different post per network from one ideaNo — you send each platform's text (customContent)zernio.com, Oct 9, 2026No — one post with platform-specific payload blocksbundle.social, Oct 9, 2026Yes — one request returns a native post for every network
MCP server for AI agentsHosted, OAuth or API keyzernio.com, Oct 9, 2026Local (npx) with an API key; a hosted server is on its roadmapinfo.bundle.social, Oct 9, 2026Hosted, API key or OAuth 2.1 sign-in
Refund or guaranteeNo refunds (usage-based billing)zernio.com, Oct 9, 2026Fees are non-refundable (its terms)bundle.social, Oct 9, 202614 days on every paid plan
Of the 10 networks PostWire publishes to, listed9 of 10 (not listed: Mastodon)zernio.com, Oct 9, 20269 of 10 (not listed: Telegram)bundle.social, Oct 9, 202610 of 10

16 of 16 Zernio and bundle.social cells carry their source and read date. "Not listed" means we could not find it on the vendor's own pages. PostWire's column comes from the code that bills you (src/plans.js).

Where PostWire is ahead

  • The lowest bill of the three for an agency. 10 clients on 5 networks: $29 a month on PostWire Pro, every network included. Zernio: $168; bundle.social: $100.
  • Per business, not per account. 10 businesses on 5 networks are $29 a month, and a sixth network costs nothing. Zernio bills each connected account — first 2 free, then $6, $3 and $1 each — so the same 50 accounts are $168.
  • Each network's post written for you from one idea, in one request — a hook-first TikTok caption, a YouTube title and tags, a longer LinkedIn post. bundle.social takes one post with platform-specific payload blocks that you fill (its MCP page, Oct 9, 2026).
  • It writes the posts. One request returns a native version for each network from one idea. On Zernio you send the text for each post.
  • A hosted MCP server you add to Claude by signing in (OAuth 2.1). bundle.social's MCP server runs locally with npx and an API key; a hosted one is on its roadmap.
  • A 14-day refund on every paid plan. Zernio's usage-based billing has no refunds.
  • $29 for 10 businesses, every network included. bundle.social's first paid plan is $100 a month (Pro).

Switching from either one

Move from Zernio: field mapping and converterMove from bundle.social: field mapping and converterPostWire vs ZernioCost for 3 to 50 clients

Questions people ask

What is the difference between Zernio and bundle.social?

Zernio bills connected social account — one profile on one platform; bundle.social bills posts a month, per organization; unlimited social accounts on paid plans. Cheapest paid plan: Zernio $6 per account a month, after the first 2 free, bundle.social $100 a month (Pro, 10,000 posts). Each fact on this page links the vendor page it was read from and the date.

How much do Zernio and bundle.social cost for 10 clients?

For 10 client businesses on 5 networks each: Zernio $168 — per account, bundle.social $100 — Pro, read on their pricing pages. PostWire: $29 a month (Pro), every network included.

Is there an alternative to Zernio and bundle.social?

PostWire is a posting API priced per business that also writes each network's post from one idea, in the same request that publishes — over REST, n8n, Make or its hosted MCP server. It has a free plan with the API and MCP (1 business, no card) and a 14-day refund on paid plans.

How do I move from Zernio or bundle.social to PostWire?

Each has a switching kit with the field-by-field mapping and a converter that turns a request into PostWire's: https://postwire.io/migrate/from-zernio/ and https://postwire.io/migrate/from-bundle-social/.

Type one idea and see the post each network gets.

The demo on the home page writes live, with no account, and never publishes. The free plan covers one business — every network connects free, 2 networks per post — with no card and no time limit. Paid plans have a 14-day refund.

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