Zernio

One API to post everywhere and message anyone.

Overview

Anyone who has built a social scheduler knows the pain: every platform has its own auth, rate limits and review process. Zernio sells you one API that sits over all of it, covering around 16 social platforms and 7 ad networks, and extends it to messaging channels like WhatsApp, iMessage and SMS.

Pricing is per connected account rather than per seat, which suits agencies and developers building products on top. Zernio's Product Hunt page claims 200,000 developers; that is the company's own figure. It finished second of the day on 9 October 2026.

Key Features

  • Single API for scheduling and publishing across many social platforms

  • Managed ads across ad networks

  • WhatsApp, iMessage, SMS, RCS, calls and phone numbers

  • Analytics, unified inbox for comments, DMs and reviews

  • Webhooks and a blog API for WordPress and Shopify

  • MCP server for AI agents

Pricing

Starting price

$6/mo per account

Usage-based, charged monthly to the card on file. There are no fixed plans.

Social accounts, per month (graduated): accounts 1-2 free; 3-10 at $6 each; 11-100 at $3 each; 101 and up at $1 each. Each rate applies only to accounts inside that band. Example: 20 accounts costs $78/mo. Accounts meter daily and prorate on connect or disconnect.

Included with every account: unlimited scheduling and publishing, analytics, inbox, API access, webhooks, blog API.

Metered add-ons: first 10,000 messages a month free, then $1 per 10,000. First 500 active ads per account free, then metered. Phone numbers $3 to $30+ a month depending on country and type. Calls, SMS, WhatsApp, RCS and iMessage priced by destination and message type; exact rates not listed in the summary I could verify.

Free tier: two connected accounts, no card.

Pros

  • One integration instead of a dozen platform APIs

  • Two connected accounts free, no card

  • Per-account price drops fast with volume: $1 per account past 100

  • Every account includes analytics, inbox, webhooks and API access

  • MCP support makes it easy to wire into AI agents

Cons

  • Costs are layered: accounts, then messages, phone numbers, calls and ads all meter separately

  • Messaging rates vary by country and type, so bills are hard to forecast

  • The 200,000 developers claim is the company's own, not independently verified

  • Young product with no independent reviews yet

  • Depends on third-party platform APIs, which can change or break without notice

What Makes It Unique

It bundles social publishing, ads and messaging channels like iMessage and WhatsApp behind one API and one MCP server, where most rivals stop at social posting.

Kay Score

7

/ 10

Tool Information

Pricing

$6/mo per account

Category

Automation & AI Agents

Platform

Web / iOS / Android

Last Updated

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