vs
The Postiz Alternative
With the Full Social Layer
Postiz is a creator dashboard with a public API attached - capped at 100 requests per hour. Zernio is an API and MCP server engineered for production: 1200 req/min, 99.97% uptime SLA, webhooks on every plan.
No credit card required · SOC 2 + GDPR · Comments, DMs, Analytics & Ads included
// Simple API key authentication
fetch('https://zernio.com/api/v1/posts', {
method: 'POST',
headers: {
'Authorization': 'Bearer YOUR_API_KEY',
'Content-Type': 'application/json'
},
body: JSON.stringify({
platforms: ['instagram', 'twitter', 'linkedin'],
content: 'Hello world!'
})
})One runs the whole operation. Another publishes.
What you get with Zernio
- ✓1200 req/min rate limit (~72,000/hour) - published
- ✓99.97% uptime SLA with public status page
- ✓MCP server included - drop into any AI agent
- ✓Ads API across 6 networks (Meta, Google, TikTok, LinkedIn, Pinterest, X)
- ✓Webhooks on every plan - no upgrade required
- ✓One auth model, one request shape across 15+ platforms
What Postiz adds (if you're a creator, not an integrator)
- ✗Canva-like visual editor
- ✗AI Copilot + image/video gen - gated to Team plan and up
- ✗In-app calendar and team seats - for human users, not API callers
- ✗Self-hosting option - you own ops, OAuth rotation, platform breakage
- ✗100 req/hour API cap (cloud) - fine for hobby, not for SaaS
- ✗No Ads API, no MCP server, no published uptime SLA
Feature Comparison
| Feature | Zernio | Postiz |
|---|---|---|
| API rate limit | 1200 req/min (~72,000/hr) | 100 req/hour (cloud) |
| Uptime SLA | 99.97% guaranteed | Not published |
| MCP server | 280+ tools | 9 tools (publish only) |
| Comments & DMs API | Yes | No |
| Ads API | 6 networks | No |
| Webhooks | All plans | Available |
| AI content generation | Not included | AI Copilot, image & video gen |
| Visual editor | Not included (API-only) | Canva-like editor |
| Setup time | 30 seconds | Minutes (cloud) or hours (self-hosted) |
| Pricing model | Per-account, no cliffs | Channel-locked tiers |
The 720x gap
Postiz's documented API rate limit is 100 requests per hour on cloud. Zernio's is up to 1200 requests per minute - about 72,000 per hour. If you're building anything with real traffic, that single number ends the comparison.
For any integration that posts more than once a minute per account, Postiz's 100 req/hour cap makes the headline price irrelevant.
Build automations with MCPs
If you're building an AI agent that acts on social, the MCP server is your entry point. Postiz's MCP server is built for content production: generate, schedule, publish. Zernio's 280+ tools cover the full social and messaging layer: publishing, comments, DMs, analytics, and ads.
| MCP capability | Zernio | Postiz |
|---|---|---|
| Tools exposed | 280+ | 9 |
| Publish & schedule | Yes | Yes |
| Generate images/video | Via your own model | Yes (built in) |
| Read/reply to comments | Yes | No |
| Send DMs | Yes | No |
| Pull analytics | Yes | No |
| Manage ads | Yes | No |
Pricing
| Scale | Zernio | Postiz | Winner |
|---|---|---|---|
| 2 accounts, solo dev | Free | $29/mo (Standard, no team seats, no AI) | Zernio |
| 10 accounts, want webhooks + team | $48/mo, full feature set | $39/mo Team (no analytics on smaller plans, capped 100 req/hr) | Zernio (no cliffs, no caps) |
| 31 accounts | $111/mo (smooth pricing) | $99/mo Ultimate — forced jump from $49 | Zernio (no tier cliff) |
| 100 accounts | $318/mo, every feature | $99/mo capped at 100 req/hr, no SLA | Postiz looks cheaper — until you hit the rate limit on day one |
| 500 accounts | $718/mo | Custom — Ultimate maxes at 100 | Zernio (Postiz can't price this without a sales call) |
For any integration that posts more than once a minute per account, Postiz's 100 req/hour cap makes the headline price irrelevant.
API Maturity
Zernio API (2023+)
- ✓Launched 2023 as an API product — 2+ years in production
- ✓Unified REST: one request shape across 15+ platforms
- ✓Rate limits: 60-1200 req/min, published per endpoint
- ✓99.97% uptime SLA with public status page
- ✓MCP server for AI agents
- ✓OpenAPI 3.1 spec, LLM-friendly docs
Postiz: API bolted on (2024)
- -Public API shipped 2024 alongside a UI-first creator app
- -Platform-specific endpoints — not unified
- -Rate limit: 100 req/hour cloud, 90/hour self-hosted
- -No published uptime SLA — community-supported
- -MCP server with 8 tools
- -No Ads API
Real-World Scenarios
SaaS embedding social posting
You're shipping a feature in your product that posts on behalf of customers. You need predictable rate limits, an SLA, and webhooks.
Winner: Zernio ✓
1200 req/min, 99.97% SLA, webhooks on every plan. Postiz caps at 100 req/hour.
AI agent that posts on command
You're building an agent (Claude, Cursor, internal copilot) that schedules content as a tool call.
Winner: Zernio ✓
Zernio ships an MCP server. Postiz has none.
Agency platform with ads + organic
You manage 30-100 client accounts and need both organic posting and ad campaign control.
Winner: Zernio ✓
Zernio includes Ads API across 6 networks. Postiz has no Ads API.
Internal creator tool for one brand
You want a finished UI, AI image gen, and a calendar — not an API.
Winner: Postiz ✓
If you don't need an integration, you don't need Zernio. Postiz ships the dashboard you'd otherwise build.
"Open source" means you're on call
Postiz being open source is real — and it sounds free. The hidden bill: you maintain the OAuth apps for 30+ platforms, you patch when Meta or TikTok ship breaking changes, you wake up when your queue jams, you handle token refresh and rate-limit backoff. Zernio's whole reason for existing is that we do that so you don't. If you wanted to be in the social-API maintenance business, you wouldn't be reading a comparison page.
Self-hosting Postiz makes sense for one team: people who want to build Postiz, not use it.
Which One?
You're a fit for Zernio if you:
- ✓Need production-grade managed API
- ✓Want 99.97% uptime SLA guarantee
- ✓Require instant API access (30 sec)
- ✓Building SaaS or commercial tools
- ✓Value transparent, published rate limits
- ✓Need Comments, DMs, Analytics, and Ads in one integration
- ✓Use AI agents and want MCP server support
You're not a fit for Zernio (and that's fine) if you:
- →Are a solo creator looking for a posting dashboard, not an API
- →Want a Canva-like editor built into the tool
- →Are happy to host, patch, and maintain a Node app yourself
- →Don't need an SLA, webhooks at scale, or an Ads API
- →Post less than 100 times an hour across your whole account base
Common Questions
- How mature is Postiz's API compared to Zernio's?
- └The rate limit gap says it first: Postiz caps at 100 req/hour on cloud; Zernio allows up to 1200 req/min — roughly 720x more headroom. Beyond that: Zernio launched as an API product in 2023 with a 99.97% uptime SLA; Postiz bolted on an API in 2024 alongside a UI-first creator app with no published SLA. For production SaaS, that's not a close call.
- Is Postiz really open source?
- └Yes, Postiz is genuinely open source on GitHub (gitroomhq/postiz-app). That's real. But for most integrators the question isn't 'can I read the source' — it's 'who's on call when Instagram changes their auth flow.' With Postiz self-hosted, that's you. OAuth rotation, platform breakage, queue jams, rate-limit backoff — all yours. Zernio exists so you don't have to deal with any of that.
- How does pricing compare?
- └Postiz tiers lock you to channel counts: $29 (5 channels), $39 (10), $49 (30), $99 (100). Need account #31? You jump from $49 to $99. Zernio is per-account with no cliffs: free up to 2, then $6/account (1-10), $3/account (11-100), $1/account (101-2,000). The Postiz headline price also becomes irrelevant the moment your integration posts more than once a minute per account — the 100 req/hour cap kicks in before any meaningful traffic.
- Does Zernio have AI features like Postiz?
- └Zernio doesn't bundle AI — because integrators already have an LLM in their stack and don't want a second vendor charging per-image. If you're building with Claude, Cursor, or a custom agent, the MCP server is your integration point. Postiz's AI (Copilot, image gen, video gen) is gated to Team plan and up — it's a creator-facing feature, not an API-facing one.
- Can I self-host Zernio like Postiz?
- └No. Zernio is cloud-only and proprietary. Postiz can be self-hosted, giving you full control over data and customization. If self-hosting is required, Zernio is not an option — but read the open source answer first to understand what self-hosting Postiz actually involves.
- Which is better overall?
- └If you're building software, Zernio. If you're using software as a creator, Postiz. They're not competing for the same customer — which is why this page exists: to save you the eval.
Ship the integration this week.
Free up to 2 accounts. No card. 30 seconds to your first API call. 99.97% SLA from the first request.
