Roundups
Free Zernio API Alternative
Zernio is a broad communications API: social posting, ads, inbox, WhatsApp, SMS, and calls. It is usage-based, with the first two accounts free. Catpix is narrower (social scheduling) but free and simpler.
Short version: Choose Catpix for free social posting. Choose Zernio for a broad API covering ads, messaging, and phone numbers.
Quick verdict
Choose Catpix for free social posting. Choose Zernio for a broad API covering ads, messaging, and phone numbers.
Feature comparison
| Feature | Catpix | Zernio |
|---|---|---|
| Price | Free | Free 2 accounts; $6/$3/$1 per account |
| Free plan | Yes | 2 accounts |
| Platforms | 8 | 30 |
| Publishing API | Yes | Yes |
| Ads API | No | Yes |
| Messaging/phone | No | Yes |
| Analytics | Post metrics | Yes |
| MCP | No | Yes |
| White-label | No | Verify |
| Multi-tenant | No | Yes |
Zernio pricing
Zernio’s first two accounts are free. Accounts 3-10 are $6 each per month, 11-100 are $3, and 101+ are $1. Each connected account includes scheduling, analytics, inbox, and API access. Ads and messages are metered separately.
What Zernio does well
Zernio is a broad marketing infrastructure API. It covers social publishing, ads, comments, DMs, WhatsApp, SMS, and calls. That breadth is useful for products that need more than social scheduling.
What Catpix costs
Catpix is free. There is no per-channel fee, no per-seat fee, and the API is included with an account. X is the only metered network: Catpix passes X API costs through at cost ($0.015 for a plain post, $0.20 for a post with a link). Catpix currently supports eight platforms: Bluesky, X, LinkedIn, Facebook, Instagram, Threads, TikTok, and YouTube.
Where Catpix wins
- No per-channel or per-seat math: adding a platform does not add a new line item.
- The API is included with an account instead of being an enterprise upgrade.
- Open source: you can inspect the code, contribute, or self-host later.
- Android app, while many competitors are web-only or slower on mobile.
- X API costs passed through at cost instead of bundled into a subscription.
Where Zernio still wins
- Ads and campaign management.
- Messaging, WhatsApp, SMS, and phone numbers.
- Broad API surface.
- Usage-based scale.
- MCP/agent access.
Who should choose which
Choose Catpix if you need free social posting and a simple scheduler.
Choose Zernio if you need ads, messaging, phone numbers, or a broad marketing API.
FAQ
Is Zernio free?
The first two accounts are free.
What counts as an account?
One connected profile on one platform.
Does Catpix support ads or SMS?
No. Catpix focuses on social scheduling.
Which is easier to integrate?
Catpix is narrower and simpler; Zernio covers more surfaces.
Related comparisons
Try Catpix free
Schedule across eight platforms, use the API, and keep your budget for content instead of per-channel fees.
Open Catpix- Written with AI with Human edits