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
