First 2 accounts
Free
Free, no card needed
- Unlimited posts, threads and scheduling
- Analytics
- Comments, reviews and DMs
- 10,000 sent messages a month
- Webhooks and the full API
- Every platform included
Branded RCS messages from the messaging API
Social media API for posting, scheduling, analytics, messages and ads across 16 networks, priced per connected account
from$1a month per account
Zernio has a free plan. Prices in US dollars as Zernio's pricing page showed them on 11 October 2026.
Plans
Try Zernio free
Vouchernaut may earn commission when you sign up through links on this page. It never changes what we say about a product or the order we list them in.
- Web
- API
What Zernio does
This is Zernio, a small bootstrapped team in Girona, Spain that builds one API for social media. Developers and AI agents use it to post, schedule, read analytics and handle messages across many networks from a single integration.
Posting and scheduling API
One request shape publishes or schedules posts, threads, carousels, Reels, Stories and videos to 16 networks including Instagram, TikTok, LinkedIn, X, YouTube, Facebook, Threads, Pinterest, Reddit and Bluesky.
Analytics
Impressions, reach, engagement and follower tracking pulled from each network through the same API, with webhooks reporting when posts go live.
Inbox for comments and DMs
Read and reply to comments, reviews and direct messages across networks, with automated workflows that reply to comments or story mentions.
Ads API
Create campaigns, change budgets and read spend across Meta, Google, LinkedIn, TikTok, Pinterest, X and OpenAI Ads from one set of endpoints.
Messaging and phone numbers
Buy a phone number and send SMS, RCS, WhatsApp and iMessage or make calls from it, with replies in one inbox, metered at Zernio's published rates.
Blogs API
Create, schedule, edit and delete articles on WordPress sites and Shopify stores, each connected site counting as one account.
MCP server, SDKs and CLI
An MCP server lets AI agents such as Claude Code, Cursor and Codex post on your behalf, alongside official SDKs for Node, Python, Go, PHP, Ruby, Java and more, and a command-line tool.
Works with
- TikTok
- X
- YouTube
- Threads
- Bluesky
- Telegram
- Snapchat
- Google Business
- Discord
- Slack
- Meta Ads
- Google Ads
- WordPress
- Shopify
- Claude Code
- Cursor
- n8n
- Zapier
How much Zernio costs
Accounts 3 to 10
$6a month per account
10 accounts in total cost $48 a month
- Every feature on every account
- Usage-based billing, cancel any time
- Blogs API for WordPress and Shopify
- Managed ads, first 500 free then metered
Accounts 11 to 100
$3a month per account
100 accounts in total cost $318 a month
- Every feature on every account
- Self-service, no sales call
Accounts 101 and up
$1a month per account
1,000 accounts in total cost $1,218 a month
- Every feature on every account
- No cap on accounts
Enterprise
Contact sales
Custom terms past 2,000 accounts
- Custom rates and volume discounts
- SAML SSO, SCIM, MFA, audit logs and RBAC
- Dedicated Slack channel with engineering
- SOC 2 and GDPR paperwork via the trust portal
- Postpaid invoicing
Graduated pricing in US dollars: each rate applies only to accounts in its band. Sent messages over 10,000 a month cost $1 per 10,000; X API costs passed through at X's rates. Card billing through Stripe. No VAT information. Prices in US dollars, from Zernio's pricing page on 11 October 2026. Zernio may charge VAT on top, and prices can change.
Zernio pros and cons
Pros
- First two accounts free with no card, including the full API
- Every feature on every account, with no plan tiers
- Covers 16 social networks plus ads, messaging and blogs in one API
- Per-account price falls to $1 past 100 accounts
- MCP server and SDKs in many languages for agents and apps
- Trustpilot score of 4.8 from 207 reviews
Cons
- Per-account pricing adds up past about 10 accounts compared with flat-rate rivals
- Built for developers, with no point-and-click scheduler
- Publishes content but doesn't create it
- Some Trustpilot reviewers report pricing and plan changes without notice
- Prices in US dollars with no VAT information
Good for
- Developers adding social posting to their own app or SaaS
- Agencies automating posting across many client accounts
- Builders connecting AI agents to social networks through MCP
- Teams that also want messaging and ads in the same API
Look elsewhere if
- Non-technical users who want a ready-made scheduling app
- Anyone wanting AI to write the posts as well as publish them
- Businesses wanting a fixed monthly price whatever the account count
What reviewers say about Zernio
“Zernio is smooth and easy to use. defenitely worth its price. and their customer chat support is awsome.”
“the app is just awesome, its so easy to connect with claude and make infinite schedules”
“Many bugs havent been fixed, they keep changing their pricing and plans without notice.”
What reviewers like
- Quick, friendly support through chat
- Easy to connect to Claude and other AI tools
- Clean, well-documented API that is quick to integrate
- Wide coverage of networks in one integration
What reviewers complain about
- Pricing and plan changes around the rebrand
- Move from per-profile to per-account charging
- Bugs that stay unfixed for some users
- Interface and guides harder going for beginners
Zernio: what to know before you pay
The product
Zernio is a social media API. Instead of building and maintaining a separate connection to each network, you integrate once and Zernio handles posting, scheduling, comments, direct messages, analytics and webhooks. The pitch is that the API comes first: everything it builds starts as an endpoint, and you can sign up, get a key and make a first call without a demo or a form. It says it absorbs platform changes, token rotations and rate limits, so your own code stays simple.
The story
The founders were building a side project that needed to post to a few social platforms, and found each network wanted something different. The company was founded in 2025 and is led by Miki Palet. It was previously known as Late, and it says it has taken no outside funding.
What it covers
Beyond social posting, the platform reaches into ads across several ad managers, messaging channels such as WhatsApp, SMS and calls with phone numbers, and publishing to WordPress and Shopify blogs. It also works with AI coding tools and agents through an MCP server and setup prompts.
Pricing
There is a free start, with a small number of connected accounts at no cost and no card needed. After that, it charges per connected account on a usage basis, with every feature included rather than split into plans. Larger teams can ask for custom terms with security extras.
Who it suits
Developers building social features into an app, agencies automating posting, and people wiring social channels into agent workflows. It is built for people who write code, not as a point-and-click scheduling app for non-technical users, so check the docs first to see whether it fits. The company also publishes a changelog and a status page, which helps if you want to see how it is run before relying on it.
Saving
Any live code or offer is listed on this page. Copy it before you sign up, and apply it as the sign-up flow allows.
Alternatives to Zernio
Every social media & creator tools tool →
Postiz
Social media scheduler for 30+ networks that AI agents can drive through MCP, a CLI and an API; open source to self-host
7-day free trial · from $23 a month 3.6 on Trustpilot (11)
Free planBuffer
Schedules, publishes and analyses posts across 12 social networks from one calendar, with a free plan for three channels
Free plan · from $5 a month per channel 4.1 on Google Play (57,687)
Guides that cover Zernio
Social media scheduling tools worth it in the UK
A social media scheduler publishes your posts from one calendar. For Facebook and Instagram only, Meta Business Suite lists no price; Buffer's free plan covers three accounts, Publer is cheapest with approvals and Postiz suits teams who want unlimited teammates.
Questions about Zernio
Are there any Zernio discount codes?
We don't currently list a confirmed discount code. That doesn't mean the store has no promotions; check its website for current prices.
What does Zernio do?
It is one API that connects to many social networks, so you can post, schedule, reply to comments and messages and read analytics without building each integration yourself.
Is Zernio free to try?
Yes. You can start for free with a small number of connected accounts and no credit card. Beyond that it bills per connected account.
Was Zernio called something else before?
Yes. It was previously known as Late, and the site mentions a rebrand.
Does Zernio work with AI agents like Claude Code?
Yes. It lists support for tools such as Claude Code, Cursor and Codex, and offers an MCP server.
Where is Zernio based?
It is a small team based in Spain, with its headquarters in Girona.
Got a question about Zernio?