Zernio (formerly Late)
Checked 26 Oct 2026 · source · 10 networks · API yes · AI no
Developers and SaaS builders who need a social posting API priced per connected account rather than per seat.
You want a point-and-click scheduler for yourself; Zernio is positioned for developers and its pricing is metered per connected account.
Overview
Zernio, formerly Late, is a social posting API priced by connected account instead of by seat. The vendor positions it for developers and SaaS builders. It lists Instagram, TikTok, Facebook, YouTube, LinkedIn, Pinterest, Threads, X, Bluesky and Google Business, plus Reddit, Telegram, Slack, WhatsApp and iMessage outside our network list.
There are no named plans. Every account gets every feature, and posts are unlimited. The first 2 connected accounts are free with no credit card, and 10,000 messages per month are included. Accounts 3 to 10 cost $6 each, accounts 11 to 100 cost $3 each, and from the 101st account the rate is $1 each. The page lists no annual pricing.
Two details matter if you are budgeting. X API usage is passed through at X's own rates, so it is not covered by the account fee. And other items are metered separately: messages beyond 10,000 are $1 per 10,000, and phone numbers, SMS and ads are listed as extra metered items. The page shows a plain dollar sign with no currency code, which I have treated as USD. No AI assistant was mentioned on the pricing page, and the tool is not built as a point-and-click scheduler for individuals.
What it does well
- Every feature is on every account, with unlimited posts.
- The first 2 connected accounts are free, with no credit card.
- The per-account rate falls as the count rises.
- It has an API and lists ten of our networks.
What to watch out for
- It is positioned for developers, not for someone who wants a calendar.
- X API usage is passed through at X's rates on top of the account fee.
- Messages, phone numbers, SMS and ads are metered extras.
- No annual pricing is listed.
Plans and prices
| Plan | Billed monthly | Billed annually, per month | Unit | What you get |
|---|---|---|---|---|
| Usage-based (all features) | Not published | Not published | per connected account per month | Accounts 1-2 free; accounts 3-10 $6 each; 11-100 $3 each; 101+ $1 each; no annual pricing listed; unlimited posts; all features on every account |
Free plan: First 2 connected social accounts free, no credit card; 10,000 messages/month included
This is a metered ladder with a free floor. Accounts 1 and 2 are free, 3 to 10 are $6 each per month, 11 to 100 are $3 each and 101 and up are $1 each. Posts are unlimited and there is no seat charge, so the bill tracks only how many accounts you connect, plus metered extras: messages above 10,000 at $1 per 10,000, phone numbers, SMS and ads, and X usage at X's rates. For 10 accounts the account fees alone come to $48 per month.
Networks listed by Zernio (formerly Late)
- Supports Facebook
- Supports Instagram
- Supports X
- Supports LinkedIn
- Supports TikTok
- Supports YouTube
- Supports Threads
- Supports Bluesky
- Supports Pinterest
- Supports Google Business
- Does not support Mastodon
What Zernio (formerly Late) does on each network
Only what the vendor's own pages state. A blank cell means the pages do not say.
| Network | Post types | Publishing | First comment | Analytics | Inbox |
|---|---|---|---|---|---|
| feedcarouselstoryreel | Auto-publish | Yes | Yes | ||
| TikTok | videophoto carousel | Mixed | Yes | Yes | |
| textimagemulti-imagevideodocumentpollrepost | Auto-publish | Yes | Yes | ||
| Google Business | texttext+imagetext+call-to-actioneventoffer | Auto-publish | Yes | Yes | |
| textimagevideomulti-imagelink carouselstoryreel | Auto-publish | Yes | Yes | ||
| X | textimageGIFvideothreadreplyquotepoll | Auto-publish | Yes | Yes | |
| YouTube | videoshort | Auto-publish | Yes | Yes | |
| Threads | Auto-publish | ||||
| pin | Auto-publish | ||||
| Bluesky | Auto-publish |
- Needs: Business or Creator account; Facebook Login needed for ads scopes and paid partnership label
- Limits: Caption 2,200 chars; carousel up to 10; images JPEG/PNG 8 MB; video 300 MB (Stories 100 MB); Stories up to 60 s; 100 posts per rolling 24 hours; no text-only posts
- docs.zernio.com
- TikTok
- Needs: New connections via TikTok Business app; DMs and comments need Business app connection
- Limits: Video up to 4 GB, 3 s to 10 min; photos up to 35, 20 MB each; caption 2,200 (video), photo description 4,000; Business app accounts publish public only, drafts via Creator Inbox
- docs.zernio.com
- Needs: Personal profile or organization page; comments only for organization pages; DMs unavailable
- Limits: 3,000 chars; up to 20 images; video up to 5 GB, 10 min personal and 30 min organization; duplicate content rejected
- docs.zernio.com
- Google Business
- Needs: Verified location
- Limits: 1,500 chars; one image JPEG/PNG up to 5 MB, min 400x300; no video; analytics at location level only
- docs.zernio.com
- Needs: Page where user is Admin or Editor; personal profiles cannot post
- Limits: Up to 10 images or 1 video; images 4 MB; video 4 GB, 240 min feed, 60 s Reels, 120 s Stories; 100 posts per day
- docs.zernio.com
- X
- Needs: Card on file; X API charges passed through without markup
- Limits: 280 chars free, 25,000 Premium; up to 4 images or 1 GIF or 1 video; 50 posts per day
- docs.zernio.com
- YouTube
- Needs: One channel per profile; Brand Account needs owner or manager access
- Limits: Title 100, description 5,000; unverified channels 15 min, verified up to 12 h; thumbnails up to 2 MB
- docs.zernio.com
Publishing and scheduling
- Queue
- Per-account hourly cap of 25 posts; TikTok posts over the daily cap are held and published when a slot frees; other velocity rejections return 429
- Drafts and notes
- Drafts supported; LinkedIn drafts save with warnings for unresolved mentions; posts can require approval before publishing (changelog 2026-10-22)
- First comment
- LinkedIn first comment mentioned in docs (mentions in first comment post as plain names)
- Time zones
- scheduledFor plus timezone fields on POST /v1/posts
- Also listed
- One POST /v1/posts call publishes to up to 16 platforms, now or scheduled; Media can be prepared per platform (changelog 2026-10-22); Daily caps by platform: Instagram and Facebook 100, Threads 250, X 50, Pinterest 25, TikTok 15 videos and 15 photos on Business app connections
Sources: docs.zernio.com, docs.zernio.com, docs.zernio.com
Teams, approvals and clients
- Seats
- No seats; usage-based per connected account
- Roles
- Owner and full-access members manage API keys and webhooks; API keys can be scoped to profiles
- Approvals
- Posts can require approval before publishing (changelog 2026-10-22)
- Client access
- Connect flow with QR phone handoff; invites can restrict resource groups
- Workspaces and brands
- Profiles are free and group accounts
Sources: docs.zernio.com, docs.zernio.com, docs.zernio.com
Content creation and AI
- AI features
- Support Assistant: Typically $0.10 to $0.50 per question, capped at $3 per question and $100 per account per month; Hosted MCP server: 20 core tools, about 50 visible, rest on demand
- Links and UTM
- Meta and Google ads can auto-add a Zernio tag (changelog 2026-10-26)
Sources: docs.zernio.com, docs.zernio.com, docs.zernio.com
Analytics and reporting
- Metrics
- Per-post and per-account engagement, reach and follower metrics; Instagram account insights, follower history, demographics; Facebook Page insights and demographics; YouTube channel insights, daily views, retention, demographics; Google Analytics GA4 reporting (added 2026-10-26)
- Data history
- Post analytics cached 60 minutes; follower stats refresh once a day
Sources: docs.zernio.com, docs.zernio.com, zernio.com
Inbox and engagement
- Inbox
- Read and reply to comments and DMs where platforms allow; Instagram, Facebook, X, YouTube comments; Facebook Messenger labels
- Listening
- Inbox mentions for Facebook, Instagram, LinkedIn
- Reviews
- Google Business and Facebook Page reviews via unified inbox
- Automation
- Comment-to-DM, Story reply automations on Instagram and Facebook; public-reply-only comment automations on LinkedIn, TikTok, YouTube
Sources: docs.zernio.com, docs.zernio.com, docs.zernio.com
Integrations, API and apps
- Integrations
- REST API; MCP server (mcp.zernio.com/mcp); Claude Code plugin (open source); GA4; HubSpot; Webflow; Wix; Shopify; Meta, Google, TikTok, LinkedIn, Pinterest, X, Reddit ads
- Webhooks
- Yes
- MCP server
- Yes
- Public API
- Yes
- API docs
- https://docs.zernio.com
- API authentication
- Bearer API key, or OAuth 2.1 with PKCE for third-party apps; keys scopable to profiles
- API rate limits
- Per minute: 60 (0-2 accounts), 600 (3-2,000), 1,200 (2,001+); analytics 6, 10, 20 per second; 25 posts per hour per account
- API plans
- All usage-based accounts including free tier
Sources: docs.zernio.com, docs.zernio.com, docs.zernio.com, docs.zernio.com
Pricing details
- Billing model
- Usage-based per connected social account per month, graduated tiers, all features included, no plans or seats
- Free plan
- First 2 accounts free, no credit card (covered by a $12 per month credit)
- Add-ons
- Messages: first 10,000 per month free, then $1 per 10,000; Managed ads: first 500 active ads free, then $0.01 per active ad per month; X API passed through at X rates with no markup, monthly spend cap available; Phone numbers from $3 per month; calls from $0.010 per minute US; SMS from $0.008 per US segment; iMessage $200 per month per sender
- Discounts
- Enterprise volume discounts past 2,000 accounts
- Refunds
- Refunds limited to billing errors or outages on the vendor's side
- Cancellation
- No contracts, cancel anytime; disconnecting an account stops its charges
- Currencies
- USD
Sources: zernio.com, docs.zernio.com
Security and compliance
- GDPR
- GDPR documentation available on the enterprise track (per security page)
- SOC 2
- SOC 2 Type II report available on the enterprise track (per security page)
- Single sign-on
- SAML or OIDC on Enterprise agreements, SCIM 2.0
- Two-factor login
- TOTP authenticator app with encrypted backup codes
- Status page
- Status page linked from site; URL not read
Source: docs.zernio.com
Support and onboarding
- Support channels
- Docs; Contact page; Support Assistant (usage-billed); Dedicated Slack channel (Enterprise)
- Help centre
- https://docs.zernio.com
- Training
- Guides, quickstart, SDKs, CLI, glossary
Sources: zernio.com, docs.zernio.com, zernio.com
About the company
- Founded
- 2025
- Headquarters
- Girona, Spain
- Ownership
- Bootstrapped, no outside funding (vendor states)
- Team size
- 9 people (vendor about page)
Source: zernio.com
Recent product changes
2026-10-26
Google Analytics GA4 reporting
Connect GA4 properties and run standard or realtime reports
2026-10-25
Ads rules and ad_rule.triggered webhook
Scheduled rules can notify, pause, activate or adjust budgets
2026-10-24
Facebook posts can be pinned and unpinned
Also Pages public info management and visitor posts listing
2026-10-22
Posts can require approval before publishing
Also per-platform media preparation
2026-10-23
Zernio updates: HubSpot inbox sync, Wix and Webflow blogs, Shopify orders
Blog roundup
2026-10-16
Zernio updates: Reddit Ads, Commerce API and support from your code
Blog roundup
2026-10-02
Zernio updates: RCS, branded calling, one API for every ad pixel
Blog roundup
Limits the vendor documents
- Reddit is temporarily unavailable because Reddit blocked third-party apps from its API(zernio.com)
- Instagram and TikTok require media on every post, no text-only posts(docs.zernio.com)
- LinkedIn direct messages not available; comments only for organization pages(docs.zernio.com)
- Google Business has no video support and location-level analytics only(docs.zernio.com)
- Reconnecting a TikTok account with a different handle may delete the previous account's analytics, inbox and DM history(docs.zernio.com)
- X requires a card on file and passes through X API charges(docs.zernio.com)
Pages read for this profile (19)
- https://zernio.com
- https://zernio.com/pricing
- https://zernio.com/about
- https://zernio.com/blog
- https://docs.zernio.com
- https://docs.zernio.com/changelog
- https://docs.zernio.com/changelog.json
- https://docs.zernio.com/security
- https://docs.zernio.com/webhooks
- https://docs.zernio.com/pricing
- https://docs.zernio.com/mcp
- https://docs.zernio.com/rate-limits
- https://docs.zernio.com/platforms/instagram
- https://docs.zernio.com/platforms/tiktok
- https://docs.zernio.com/platforms/linkedin
- https://docs.zernio.com/platforms/google-business
- https://docs.zernio.com/platforms/facebook
- https://docs.zernio.com/platforms/twitter
- https://docs.zernio.com/platforms/youtube
Pick Zernio (formerly Late) if
Pick it if you are building posting into a product, or you manage many accounts and want a per-account price that falls with volume. Skip it if you want to schedule your own posts in a visual interface.
Questions people ask
Does Zernio have a free plan?
Yes. The first 2 connected social accounts are free, with no credit card and 10,000 messages per month included.
Which networks does it support?
Instagram, TikTok, Facebook, YouTube, LinkedIn, Pinterest, Threads, X, Bluesky and Google Business, plus others outside our list.
What does it cost to start?
Nothing for 2 accounts. Accounts 3 to 10 are $6 each per month.
Alternatives
Tools for a similar audience that share the most networks with Zernio (formerly Late).
How we checked
Pricing is a per-account tier ladder, not named plans, so monthlyPriceUSD is null and the tiers are in keyLimits (condensed WebFetch read; page says '$' with no currency code, treated as USD). X API usage is passed through at X's rates. Extra metered items exist (messages beyond 10,000 at $1 per 10,000, phone numbers, SMS, ads). The vendor also lists Reddit, Telegram, Slack, WhatsApp and iMessage, not in the directory network list. No AI assistant was mentioned on the pricing page.