The Zernio Alternative With Flat, Predictable Plans

An agency with 30 client accounts pays $79/month on PostZen Pro. Zernio's per-account rate prices the same 30 accounts at $108/month.

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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!'
  })
})

Why Switch?

Why PostZen vs Zernio?

PostZen API

Flat plans with included accounts
Starter, Pro, and Scale include 5, 20, or 100 accounts. Extra accounts are $3 each per month.
Cheaper from 10 to about 185 accounts
10 accounts cost $34 on PostZen and $48 on Zernio. 20 cost $49 versus $78. 100 cost $149 versus $318.
Published rate limits and SLA
60 to 2,000 requests per minute by plan and a 99.97% uptime SLA. Zernio publishes neither.
Client-facing calendar
A scheduling UI for the people who approve posts, alongside the API.
Bulk CSV import and queues
Import a month of posts from a spreadsheet or fill recurring time slots without writing code.

Zernio

Every account past the second is metered
$6 each for accounts 3 to 10, $3 each for 11 to 100, $1 each from 101 up. 30 accounts cost $108 a month and 100 cost $318.
No published rate limits or SLA
Request ceilings and an uptime commitment are not on the pricing page, so you cannot plan capacity before you sign up.
No client-facing calendar
Everything runs through the API. The people who approve posts need a scheduling UI you build yourself.
No bulk CSV import or queues
Loading a month of posts means a script, one API call at a time. There is no spreadsheet import and no recurring time slots.
Several metered line items
Inbox messages past 10,000 a month, phone, SMS, and calls are each billed on usage, so the invoice has more moving parts than one flat fee.

Feature Comparison

Side By Side

Feature comparison between PostZen and Zernio
	PostZen	Zernio
Free tier	2 accounts, 20 posts/month, full API	2 accounts, unlimited posts, no card
Pricing unit	Flat plan with included accounts, $3 per extra	Per connected account in three bands
10 accounts	$34/mo (Starter + 5 extras)	$48/mo
30 accounts	$79/mo (Pro + 10 extras)	$108/mo
100 accounts	$149/mo (Scale)	$318/mo
500 accounts	$1,349/mo (Scale + 400 extras)	$718/mo
Platforms	10	16 social plus 7 ad networks
Inbox (comments and DMs)	No	Yes, metered above 10,000 messages
X API costs	Passed through at cost	Passed through at cost
Rate limits	60 to 2,000/min (published)	Not published
Uptime SLA	99.97% (published)	Not published
Client-facing UI	Calendar included	Dashboard only
MCP server	Yes, OAuth consent	Yes, hosted

Cost At Scale

Pricing

Pricing comparison between PostZen and Zernio
	PostZen	Zernio	Winner
2 accounts	Free (20 posts/month)	Free (unlimited posts)	Zernio, if you publish more than 20 posts a month on two accounts
5 accounts	$19/mo (Starter)	$18/mo	Even
10 accounts	$34/mo (Starter + 5 extras)	$48/mo	PostZen
30 accounts	$79/mo (Pro + 10 extras)	$108/mo	PostZen
100 accounts	$149/mo (Scale)	$318/mo	PostZen
200 accounts	$449/mo (Scale + 100 extras)	$418/mo	Zernio, by $31; the curves cross near 185 accounts
500 accounts	$1,349/mo (Scale + 400 extras)	$718/mo	Zernio. Talk to us about volume pricing at this scale

At a glance

Which one is right for you?

Pick PostZen When

Run 10 to about 185 connected accounts
Want a fixed monthly fee you can resell
Need published rate limits and an uptime SLA
Want a calendar UI for clients alongside the API
Import posts in bulk from CSV
Publish across the 10 major networks
Prefer a smaller, focused API surface

Pick Zernio When

Publish to Reddit, WhatsApp, Discord, Snapchat, or Google Business
Need comments and DMs through the same API
Run ads through the same vendor
Have two accounts and publish more than 20 posts a month for free
Run more than roughly 185 connected accounts
Want SDKs in Go, Ruby, Java, PHP, .NET, or Rust
Prefer pure per-account metering

FAQ

Common questions

Still have questions?

Is Zernio cheaper than PostZen?

It depends on account count. Zernio is free for two accounts with unlimited posts and costs $18 for five. PostZen is cheaper from about 10 accounts ($34 versus $48) through 100 ($149 versus $318). Zernio’s $1 band makes it cheaper again above roughly 185 accounts.

What does Zernio offer that PostZen does not?

Six more social networks (Reddit, WhatsApp, Discord, Snapchat, Google Business, and Slack in its docs), an ads API across seven networks, a unified inbox for comments and DMs, phone and SMS add-ons, and SDKs in eight languages.

What does PostZen offer that Zernio does not?

Flat plans with included accounts and unlimited posts, published rate limits from 60 to 2,000 requests per minute, a 99.97% uptime SLA, a client-facing calendar, bulk CSV import, and queue-based scheduling.

Do both pass through X API costs?

Yes. X bills per API request since February 2026, and both Zernio and PostZen pass those charges through at X’s rates. Connecting an X account on PostZen requires a card on file for that reason.

Can I migrate from Zernio to PostZen?

The request shapes are similar: connect accounts through a hosted OAuth page, upload media, then create posts with a platforms array. Most integrations move in an afternoon. Accounts must be reconnected because OAuth grants are per vendor.

Which platforms does PostZen support?

Instagram, X, LinkedIn, Facebook Pages, Threads, YouTube, TikTok, Pinterest, Bluesky, and Telegram. Zernio covers those plus Reddit, WhatsApp, Discord, Snapchat, and Google Business.

Ready to switch?

Start with the free plan and publish your first post in minutes.

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