Zernio
Zernio, formerly Late, is one API to post, schedule, read analytics and answer comments and DMs across 16 channels, among them Instagram, TikTok, X, LinkedIn and YouTube.
It suits founders building social posting into their product or an AI agent, without applying for a developer app on each platform.
It is free for 2 connected accounts, and each one after costs $6 a month or less, as checked on 29 October 2026.
Reviewed by the IndieHacked team
- What it does
- One API to post, schedule and answer comments and DMs across Instagram, TikTok, X, LinkedIn, YouTube and more, without a developer app per platform.
- Our take
- Founders building social posting into their own product, or handing it to an AI agent. One API replaces a developer app and an approval for each platform, and Claude Code or Cursor can drive it through Zernio's MCP server.
- Pricing
- FreemiumLow priceFree for 2 connected accounts, with unlimited posts and the full API. After that each account is $6 a month up to 10, $3 from 11 to 100 and $1 past 100, billed monthly, as checked on 29 October 2026. Sending more than 10,000 messages a month, and X's own API calls, cost extra.
The IndieHacked breakdown
What it does
Zernio, formerly Late, is a REST API for social media. One call publishes or schedules a post, with text, images, video, stories or reels, to the 16 channels it lists, among them Instagram, TikTok, X, LinkedIn, YouTube, Threads, Bluesky and WhatsApp. Zernio holds the developer apps and approvals for each platform, so you do not apply for your own.
The same API reads analytics, replies to comments and reviews, handles DMs and sends webhooks when a post goes out or fails. It comes with SDKs in 8 languages, a command-line tool, a dashboard with a calendar, and a hosted MCP server that Claude Code, Cursor and Codex sign in to. No-code builders reach it through n8n, Make or Zapier.
Who it suits
Founders building social posting into their product: a scheduler, a content tool, an agent that publishes for its users. Each customer gets their own profile, the API is white-label so your users never see Zernio, and a failed post is retried before a webhook tells you why.
It also suits a founder automating their own marketing from code or from an agent. With 2 accounts free and unlimited posts, a product's own Instagram and LinkedIn cost nothing to run; the bill starts with the third account.
Not the right fit for
Founders who want a scheduling app rather than an API. Zernio has a dashboard, but its pages lead with the API, and for manual scheduling of 1 to 5 accounts its own comparison says Buffer works well.
Teams that must self-host, or need Reddit today. Zernio is cloud-only, and Reddit posting is switched off since Reddit blocked third-party apps, though Reddit Ads still work. Heavy X users should set a spending cap: X's API calls are billed on top, at X's own rates.
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