Zernio vs Post Bridge: 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, Post Bridge $99 — Operator, 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, Post Bridge on Oct 9, 2026. If they changed since, their pages win.

Zernio, Post Bridge and PostWire

ZernioPost BridgePostWire
What you pay forConnected social account — one profile on one platformzernio.com, Oct 9, 2026Connected social account (one network of one client)post-bridge.com, 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$39 a month (Marketer, 15 accounts)post-bridge.com, Oct 9, 2026$9 a month (Starter, 3 businesses)
Free planYes — the first 2 accounts, no cardzernio.com, Oct 9, 2026No free plan — a 7-day trial; free users get 5 postspost-bridge.com, 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$99 — Operatorpost-bridge.com, 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 — it schedules what you give it; you customize each platformpost-bridge.com, Oct 9, 2026Yes — one request returns a native post for every network
MCP server for AI agentsHosted, OAuth or API keyzernio.com, Oct 9, 2026Hosted, OAuth sign-in, 16 toolspost-bridge.com, Oct 9, 2026Hosted, API key or OAuth 2.1 sign-in
Refund or guaranteeNo refunds (usage-based billing)zernio.com, Oct 9, 2026Within 7 days of a chargepost-bridge.com, 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, 20267 of 10 (not listed: Mastodon, Telegram, Discord)post-bridge.com, Oct 9, 202610 of 10

16 of 16 Zernio and Post Bridge 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; Post Bridge: $99.
  • 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.
  • A free plan, not only a trial. 1 business, 20 posts a month, with the REST API and the MCP server, no card and no time limit. Post Bridge has a 7-day trial, and free users get 5 posts.
  • 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.
  • Every network's post written for you, from one idea, in one request — a hook-first caption for TikTok, a searchable title and tags for YouTube, a longer first-person post for LinkedIn. On Post Bridge you write once and customize each platform yourself.
  • A 14-day refund on every paid plan. Zernio's usage-based billing has no refunds.
  • Approvals from $9 a month. On every paid plan a post can wait until a person approves each network's version, and Pro includes 25 seats with roles. Post Bridge adds team members on Operator, $99.

Switching from either one

Move from Zernio: field mapping and converterMove from Post Bridge: field mapping and converterPostWire vs ZernioPostWire vs Post BridgeCost for 3 to 50 clients

Questions people ask

What is the difference between Zernio and Post Bridge?

Zernio bills connected social account — one profile on one platform; Post Bridge bills connected social account (one network of one client). Cheapest paid plan: Zernio $6 per account a month, after the first 2 free, Post Bridge $39 a month (Marketer, 15 accounts). Each fact on this page links the vendor page it was read from and the date.

How much do Zernio and Post Bridge cost for 10 clients?

For 10 client businesses on 5 networks each: Zernio $168 — per account, Post Bridge $99 — Operator, read on their pricing pages. PostWire: $29 a month (Pro), every network included.

Is there an alternative to Zernio and Post Bridge?

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 Post Bridge 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-post-bridge/.

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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