PostWireUpload-Post vs Zernio: 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.
Upload-Post read on Oct 9, 2026, Zernio on Oct 9, 2026. If they changed since, their pages win.
Upload-Post, Zernio and PostWire
| Upload-Post | Zernio | PostWire | |
|---|---|---|---|
| What you pay for | Profile — one person or client, one account per networkupload-post.com, Oct 9, 2026 | Connected social account — one profile on one platformzernio.com, Oct 9, 2026 | One business (brand) — every network of that business included |
| Cheapest paid plan | $24 a month (Basic, 5 profiles)upload-post.com, Oct 9, 2026 | $6 per account a month, after the first 2 freezernio.com, Oct 9, 2026 | $9 a month (Starter, 3 businesses) |
| Free plan | Yes — 10 uploads a month, 2 profiles, without TikTokupload-post.com, Oct 9, 2026 | Yes — the first 2 accounts, no cardzernio.com, Oct 9, 2026 | Yes — 1 business, 20 posts a month, the REST API and the MCP server, no card |
| 10 clients × 5 networks, a month | $50 — Professionalupload-post.com, Oct 9, 2026 | $168 — per accountzernio.com, Oct 9, 2026 | $29 — Pro |
| Writes a different post per network from one idea | Partly — from a video, its AI writes the title, description and hashtags for YouTube, Instagram and TikTokupload-post.com, Oct 9, 2026 | No — you send each platform's text (customContent)zernio.com, Oct 9, 2026 | Yes — one request returns a native post for every network |
| MCP server for AI agents | Hosted (API key or OAuth), plus a local open-source serverupload-post.com, Oct 9, 2026 | Hosted, OAuth or API keyzernio.com, Oct 9, 2026 | Hosted, API key or OAuth 2.1 sign-in |
| Of the 10 networks PostWire publishes to, listed | 10 of 10upload-post.com, Oct 9, 2026 | 9 of 10 (not listed: Mastodon)zernio.com, Oct 9, 2026 | 10 of 10 |
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. Upload-Post: $50; Zernio: $168.
- Every network's post written from a text idea, in the same request: TikTok caption, Instagram caption, YouTube title, description and tags, LinkedIn post, Bluesky under 300 characters. Upload-Post's AI writes the title, description and hashtags starting from a video, for YouTube, Instagram and TikTok (its pricing page, Oct 9, 2026).
- 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.
- TikTok on the free plan. Upload-Post's free plan (2 profiles, 10 uploads a month) does not include TikTok.
- 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.
- Links stay in X posts. A post with a link uses 10 of the X credits every paid plan includes. Upload-Post removes links from X posts unless you pay +$19 a month.
- A 14-day refund on every paid plan. Zernio's usage-based billing has no refunds.
Questions people ask
What is the difference between Upload-Post and Zernio?
Upload-Post bills profile — one person or client, one account per network; Zernio bills connected social account — one profile on one platform. Cheapest paid plan: Upload-Post $24 a month (Basic, 5 profiles), Zernio $6 per account a month, after the first 2 free. Each fact on this page links the vendor page it was read from and the date.
How much do Upload-Post and Zernio cost for 10 clients?
For 10 client businesses on 5 networks each: Upload-Post $50 — Professional, Zernio $168 — per account, read on their pricing pages. PostWire: $29 a month (Pro), every network included.
Is there an alternative to Upload-Post and Zernio?
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 Upload-Post or Zernio 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-upload-post/ and https://postwire.io/migrate/from-zernio/.
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.