Blotato vs Zernio: Two Social Media APIs Your AI Agent Can Run
Blotato vs Zernio after Zernio's relaunch as marketing infrastructure: what an AI agent can do on each social media API, and what moves each bill.
Blotato vs Zernio is a choice between two social media APIs you point an AI agent at. Blotato and Zernio each run a hosted MCP server, so Claude, ChatGPT, or a Codex session connects to either one and starts publishing without you building a posting pipeline. The choice is about what the agent can do once it is connected, and what the bill does afterward.
The difference is how far past social each one goes. Zernio now calls itself “marketing infrastructure for agents,” and the same key that publishes to its social channels also runs ads, sends SMS and WhatsApp messages, places calls, and buys phone numbers. Blotato stays agent infrastructure for social media marketing. One key on a flat plan publishes to nine platforms, reads analytics on eight, answers Instagram and Facebook comments and DMs, and runs the DM automations a comment triggers.
So the question is how much of your agent’s job sits outside social. If it also buys ads, texts customers, or picks up the phone, Zernio covers that from one key and Blotato sells none of it. If the job is social, from the post going out to the Instagram or Facebook DM that turns a follower into a lead, Blotato covers it on a flat plan instead of a per-account meter.
Then there is the bill. Zernio gives you two accounts free, with no card, then charges per account, while Blotato charges $29 a month flat for twenty. Because our plans step at 20 and 40 accounts and Zernio’s ladder climbs smoothly, the cheaper tool changes hands more than once. Every band is below, including the three where we lose.
Blotato vs Zernio: Decide on Reach and Account Count
Zernio is the better pick if: your agent also runs ads, SMS, or calls, you need to reach Telegram, Discord, Slack, WhatsApp, or iMessage, your reply workflows live on X or LinkedIn, or you connect fewer than seven accounts, sit between 21 and 26, or run more than 40.
Blotato is the better pick if: your agent’s whole job is social (publishing, reading analytics, and answering or automating Instagram and Facebook DMs) and you run 7 to 20 or 27 to 40 accounts. See what the flat plan includes.
Before you price either one: Zernio bills X (Twitter) API usage per request on top of its per-account rate, and a post carrying a link is $0.200 of that. A thousand link posts a month is $200 the account calculator never showed you. Blotato includes X publishing in the plan. That single line moves the total more than most of the pricing bands below do, so run it first if X is part of your mix.
Two Kinds of Infrastructure, One Key Each
They sit in different categories, and pretending otherwise would make this comparison useless. Here is what each product is, on its own documentation, today.
| Zernio | Blotato | |
|---|---|---|
| What it is | In its own words, “marketing infrastructure for agents”: one integration that “covers social, blogs, messaging, voice, and ads.” Its social side is the category I mapped in this rundown of social media API tools | Agent infrastructure for social media marketing: a hosted REST API and MCP server, plus a web app on the same account |
| Built for | Developers and product teams wiring social into code or an agent | Builders running social through an AI agent, and the creators and small teams who work in the app |
| Programmatic surface | REST API, eight SDKs, a CLI, and a hosted MCP server with 496 tools | REST API, a hosted MCP server with 35 named tools, and native n8n and Make nodes |
| What the agent can do | Publish, schedule, message, comment, run ads, read analytics, send SMS, place calls | Publish, schedule, read analytics, reply to Instagram and Facebook comments and DMs, run DM automations on those two, generate images and video |
| Engagement reach | DMs on 9 channels, comments and reviews on 8 | Instagram and Facebook |
| Content creation | None. Its own comparison page marks AI content “No” for Zernio | Writing, images, and faceless video on the same plan |
| What the bill tracks | Connected accounts, plus metered messages, X API calls, ads, phone numbers, calls, and SMS | A flat plan with an account allowance. Credits move only for AI image and video |
What the table adds up to: Blotato is agent infrastructure for social media marketing, a hosted API and MCP server with 35 tools that publish to nine platforms, read analytics on eight, and run Instagram and Facebook comment-to-DM automation, on a flat plan. Zernio’s own page about us has not caught up with its relaunch, since it still describes Zernio as “posting infrastructure, not a content studio.”
The Developer Zernio’s Free Tier Is Aimed At
Zernio is built for developers, and its pricing FAQ says so: it is for “developers and teams with technical resources.” It has also added a guide for connecting an AI assistant to its MCP server. It ships SDKs in Node, Python, Go, Ruby, Java, PHP, .NET, and Rust, plus a CLI, all documented per language, which is more official client coverage than Blotato or most of this category ships.
The product was called Late, at getlate.dev, until it rebranded to Zernio, and integrations built against Late kept working through the change.
Its reach is the widest here, and its marketing-infrastructure relaunch made official that it runs past social. It publishes to 16 platforms, social networks plus WhatsApp, Telegram, Discord, Slack, and Google Business, with Snapchat in closed beta and iMessage sold as a paid sender. Nine ad networks sit alongside them (Meta counts Facebook and Instagram as one), plus phone numbers, SMS, and calls billed per number, message, and minute.
Its MCP server at mcp.zernio.com/mcp exposes 496 tools, 20 hand-built core tools plus one generated from the OpenAPI spec per endpoint, with about 50 visible by default and the rest found through a search tool. That puts it alongside most of the social media MCP servers worth knowing about. I would lean on its documentation, since I could not verify a review score myself.
Where Blotato’s Reader Usually Comes From
Blotato is an app I built, so weigh what follows accordingly.
Blotato is for the person, or the agent, running the whole social loop: publish, read the numbers, answer what comes back, and make the content too. Most of our users run it from Claude Code, Claude Desktop, or an n8n or Make workflow rather than the dashboard, and the app is there for the ones who prefer it.
The flat plan covers publishing to nine platforms, analytics on eight of them (LinkedIn returns no metrics yet), comments and DMs on Instagram and Facebook, and DM automation on those two, where a comment or an inbound message triggers the reply and nothing goes out cold, with 1,000 active contacts a month on Starter. Writing is unlimited on every plan, and AI image and video generation draw on one credit pool in the same plan. The REST API and the hosted MCP server at mcp.blotato.com/mcp sit beside native n8n and Make nodes, and twenty accounts are included at $29 with no per-account meter.
One thing to know before you sign up, especially if you came for the API: the 7-day trial covers everything except the API, and generating an API key ends the trial and starts the paid Starter plan. If the API is the reason you are here, plan on starting the subscription rather than trialing it.
Zernio vs Blotato: Side by Side
| Category | Zernio | Blotato |
|---|---|---|
| Pricing model | Per connected account | Flat rate |
| Free plan | Yes, 2 accounts, no card | No (7-day trial, card required, cancel anytime) |
| Cheapest paid entry | $6 for a 3rd account | $29/mo flat (Starter, 20 accounts) |
| Channels supported | 16 for publishing on its homepage, agents page, llms.txt, and docs. Its docs count 32 once ad networks, phone, SMS, RCS, iMessage, and blog channels join | 9 |
| Messaging apps | Included (WhatsApp, Telegram, Discord, Slack), plus iMessage at $200/mo per sender | Not offered |
| Ad networks | 9, through one ads endpoint, with automated rules on seven of them | Not offered |
| Phone numbers, SMS, and calls | Yes, numbers from $3/mo, SMS and calls metered | Not offered |
| AI text writing | Not offered | Yes, included |
| AI image generation | Not offered | Yes, uses AI credits |
| AI video generation | Not offered | Yes, faceless video with voiceovers |
| Public REST API | Yes, on the free tier | Yes, on paid plans |
| SDKs | 8 languages plus a CLI | REST API |
| n8n / Make nodes | Available | Native nodes for both |
| Hosted MCP server | Yes, 496 tools | Yes, 35 tools |
| Analytics | Social platforms, per its rate card | 8 of 9, LinkedIn excluded |
| DMs and comments | DMs on 9 channels, comments and reviews on 8 | Instagram and Facebook |
| Post approvals | Yes, a pending post never publishes until someone approves it | No approval step; the web app has drafts |
| Website analytics | GA4 reports through the same API | Not offered |
| DM automation | Comment automations via the API | Instagram and Facebook, triggered by a comment or message, 1,000 active contacts a month on Starter |
| Outbound messages | 10,000 a month free, then $1 per 10,000 (from October 1, 2026) | Not metered |
| Published API rate limit | 60 req/min free, 600 on paid accounts, 1,200 past 2,000 accounts or by request (its docs and llms.txt disagree) | 30 req/min publish, 60 reads, 120 media uploads |
| Per-platform posting caps | 25 posts/hour per account, plus daily caps: Instagram 100, Facebook 100, Threads 250, X 50, Pinterest 25 | Instagram 50/day, LinkedIn 50 per profile and per Page, Facebook 25/Page, Pinterest 10 to 50/day by account views |
| Public status page | Yes | No |
| X (Twitter) API charges | Billed on top: $0.015 a post, $0.200 for a post with a URL, $0.005 a read | Included in the plan, not billed per request |
The two rows that decide most cases sit at opposite ends. Zernio reaches more places and starts free. Blotato closes the loop and holds the price still.
What Each Side Actually Publishes on Reliability
Reliability is where Zernio makes its loudest case against us, so here is each claim on its comparison page, checked against what each side actually publishes. Some of it holds. Some of it does not.
| Zernio’s claim about Blotato | What the documentation says | Check it |
|---|---|---|
| ”30 posts/min global rate limit (undocumented)” and “buried in different contexts” | The publish endpoint’s limit is 30 requests a minute, stated in the open in the API reference | Blotato plan and request limits |
| ”60-1200 req/min” set against Blotato “1.5 posts/min,” the figure its “40x faster” banner divides by | Two units in one row. The 1.5 appears nowhere in our docs, the FAQ on that same page says 30, and Zernio’s llms.txt says its own limit “applies only to API request throughput” | Zernio llms.txt |
| ”Designed for n8n/Make, not standalone REST” and “API requires paid automation platform” | The API is a standalone REST surface with its own base URL and an API key header, documented for direct HTTP. The n8n and Make nodes are optional | Blotato API quickstart |
| ”3 TikTok accounts per 24h” even with 20 connected | True on Starter: 3 TikTok destinations per rolling 24 hours, a cap Creator and Agency do not have, which the page leaves out | Blotato posting limits |
| ”No published uptime SLA or status page” | True. We publish neither | This post |
| ”99.97% uptime SLA, publicly documented” | Zernio’s own pricing FAQ says “We maintain 99.7%+ uptime.” I could not find an SLA document behind either figure | Zernio pricing |
| ”2.3 million posts delivered” | The same pricing FAQ says “over 2 million,” and Zernio’s relaunch page says “more than 13 million” | Zernio’s pricing FAQ and relaunch page |
The rate limit is the number the whole page is built on, and it measures two different things that the banner rolls into one. Zernio’s request limits run 60 a minute on the free tier and 600 on paid accounts, and its two surfaces disagree on the 1,200 tier: llms.txt says “contact support to upgrade,” while its rate-limit guide grants it past 2,000 connected accounts. Ours is 30 a minute on the publish endpoint, with reads at 60 and media uploads at 120. On raw request throughput through a single key Zernio is ahead at every tier, while the 40x in the banner divides its free-tier 60 by a “1.5 posts/min” that appears nowhere in our docs.
What the banner then does is restate that throughput as “posts/min,” which its own rate-limit guide rules out: a velocity cap of 25 posts an hour per account, plus daily caps of Instagram 100, Facebook 100, Threads 250, X 50, and Pinterest 25. Neither tool posts 1,200 times a minute to a social network.
Per single account, Zernio’s published caps are mostly more generous: Instagram 100 a day against our 50, Facebook 100 against our 25 per Page, and Pinterest 25 against our 10 to 50, set by the account’s monthly views. If you run one busy account per platform, Zernio lets you push more through it than we do.
Zernio’s own docs attribute those per-platform caps to “the social-network side,” while ours are anti-spam limits we add on top and keep stricter on purpose. On posting volume per account, that is a limit of ours, not of the platforms.
At 99.7% that works out to roughly 26 hours of downtime a year, at 99.97% about 2.6 hours, and those are not the same promise. On the status page itself the gap is ours to own: Zernio runs one and we do not, so if a public incident feed is something your team checks during an outage, that is a box we leave unticked.
The TikTok cap is ours and I will not argue with it. If you run TikTok at volume across many accounts on our entry plan it will bite, and Creator is the answer to that.
Where Zernio Wins on Reach and Entry Price
The free tier is real. Two accounts, full feature access, no credit card. Blotato has no equivalent. For anyone validating an idea before spending money, that decides it.
Platform reach is wider. Sixteen platforms against Blotato’s nine, and that count includes WhatsApp, Telegram, Discord, Slack, and Google Business alongside the major social networks, with iMessage on top. If your workflow needs any of those, no Blotato plan reaches them, and the comparison ends at the platform list.
It reaches customers outside social. Zernio’s key also runs ads on nine networks, including ChatGPT and Microsoft ads, and buys phone numbers that carry SMS, calls, and WhatsApp, none of which Blotato sells. That part of the job needs a second vendor on our side.
The inbox reaches further, if your replies happen outside Meta. Zernio’s rate card lists DMs on nine of its channels and comments and reviews on eight, against Instagram and Facebook on Blotato. Its agents page says you can reply “on any platform that has one,” which the rate card does not support: it leaves TikTok and Reddit off the comments list, though its llms.txt and newer docs say TikTok comments work on Business-app connections, and its llms.txt says Reddit posting and messages are switched off for now. If reply workflows on X or LinkedIn are part of the job, Zernio covers them.
Post approvals are built in. Since its October 29 update, a Zernio post can wait for approval before it is scheduled, and a pending post never publishes on its own. A rejected post goes back to drafts, and Zernio pitches it for agencies that want client sign-off in their publishing flow. Blotato has drafts in its web app but no approval step, so a scheduled post goes out as scheduled. If you drive Blotato from n8n, you can mark its publish tool as sensitive so the agent pauses for Approve or Reject, but that gate lives in your workflow, not in Blotato.
Developer tooling is deeper. Eight official SDKs and a CLI, so a team writing Rust or .NET gets a native client that Blotato does not ship.
There are no feature tiers to decode. Every feature is included on every account, so nothing you need sits behind an upgrade. The bands table below covers where that lands cheaper than we do.
One Flat Key for the Social Loop
The loop runs on one flat plan. The same MCP server that publishes also reads analytics on eight platforms, reads and answers Instagram and Facebook comments and DMs, and runs comment-to-DM automations on those two, all on the same flat plan.
Posting to X costs extra on one side and not the other. Zernio passes X (Twitter) API charges through per request on top of the per-account price. Its own rate card publishes the rates plainly: $0.015 for a post or DM send, $0.005 for a read, and $0.200 for a post that contains a URL. Those rates sit outside the per-account calculator, so the number you price the tool on is not the number you pay. On Blotato, X publishing is in the plan and is not billed per request.
Only the media meter moves. Zernio meters connected accounts daily and adds meters for outbound messages past 10,000 a month, for X API calls, for active ads, and for phone numbers, calls, and SMS. Blotato’s invoice is the plan. The credit pool is the one meter, it spends on AI image and video, and Blotato’s billing documentation states that publishing, scheduling, and API calls never consume credits.
The content gets made. Blotato writes posts, generates images, and produces faceless video with voiceovers inside the plan. Zernio’s own comparison table marks AI content “No,” so if you need that part solved too, it comes from somewhere else in your stack.
Per-Account Curve vs Flat Rate: Where They Cross
Zernio’s ladder is graduated, so each band’s rate applies only to the accounts inside it: the first two are free, accounts 3 to 10 are $6 each, 11 to 100 are $3, and anything past 100 is $1. Blotato steps instead of climbing, at $29 for 20 accounts, $97 for 40, and $499 for 100. Here is what that produces as actual monthly totals, which is the only version that helps you decide:
| Connected accounts | Zernio | Blotato |
|---|---|---|
| 2 | $0 | $29 |
| 5 | $18 | $29 |
| 10 | $48 | $29 |
| 20 | $78 | $29 |
| 40 | $138 | $97 |
| 50 | $168 | $499 |
| 100 | $318 | $499 |
Because Blotato’s plans step and Zernio’s ladder climbs, the cheaper tool changes hands four times across five bands. Here is every band, with the condition that makes each row true:
| Connected accounts | Cheaper on publishing price | Why, and when it holds |
|---|---|---|
| 1 to 6 | Zernio | Two accounts are free and $6 each stays under $29, as long as X link posts stay light |
| 7 to 20 | Blotato | Starter’s flat $29 covers all twenty, and the bill stays put as you fill them |
| 21 to 26 | Zernio | Blotato steps up to Creator at $97 before Zernio’s ladder reaches it, if publishing is all you need that month |
| 27 to 40 | Blotato | Zernio passes $97 at the twenty-seventh account, and Creator’s 40 accounts cover the band |
| 41 to 100 | Zernio | Blotato steps up to Agency at $499, a jump Zernio’s ladder never makes. Agency tops out at 100 accounts, and above that we quote a custom arrangement |
That 21 to 26 band is a real gap and I would rather name it than round it away. If you sit inside it and only need publishing, Zernio is the cheaper tool that month, and if your engagement lives outside Instagram and Facebook, every Zernio row in that table gets stronger.
Two Free Accounts or a Wider Inbox? Zernio, Honestly.
- You connect two accounts and want to pay nothing, or up to six where Zernio is still cheaper, or sit between 21 and 26, or run more than 40
- Your agent needs paid ads or a phone number as well as social
- A client has to approve each post before it is scheduled
- You need Telegram, Discord, Slack, WhatsApp, or iMessage
- Your inbox lives outside Instagram and Facebook, on X, LinkedIn, or WhatsApp
- Your team writes in Rust, .NET, Go, or another language where an official SDK matters
When Blotato Is the Better Fit
- You run 7 to 20 or 27 to 40 social accounts
- You want the same key to publish, read analytics, and answer Instagram and Facebook DMs
- You want a bill that stays put as you fill your plan’s account allowance
- You are paying for a separate AI writing or image tool alongside your scheduler
- You would rather point Claude at a hosted MCP server than build a posting pipeline
Where I’d Argue, and Where I Wouldn’t
Blotato is mine, and even so, I would not try to talk a developer with two or three accounts off Zernio. It is a good product with a clear pricing page, and at that size it costs less than we do.
The Blotato vs Zernio comparison changes when two things are true at once: your account count sits in one of Blotato’s two winning bands, and your agent’s job stays inside social. Blotato is already cheaper on the publishing line inside those bands. The second condition decides whether Zernio’s wider reach is worth anything to you, and for an agent that never touches ads, SMS, or calls, that part of it goes unused.
Outside those bands, run your own number through the table above and Zernio may well win. And if neither of these two fits, I ranked eight Zernio alternatives through the same account-count lens.
If you land in one of Blotato’s bands, add up your current publishing bill and any DM or content tool you run beside it, then compare that total against Blotato’s Starter or Creator plan. If the API is what you came for, remember it sits outside the trial. Already on Zernio? Copy the queue before you disconnect anything, since a disconnect cancels what’s left on that account.
Blotato vs Zernio FAQs
Is Blotato cheaper than Zernio?
It depends on your account count, and on whether X is part of your mix. On the publishing line alone Blotato is cheaper from 7 to 20 accounts and again from 27 to 40 (ten accounts is $48 against $29, forty is $138 against $97), while Zernio is cheaper below seven, between 21 and 26, and past forty. My Zernio pricing breakdown maps the whole curve.
Two meters sit outside that math and both fall on Zernio’s side: X API usage bills per request on top of the account price, at $0.200 for a post carrying a link, and outbound messages past 10,000 a month carry their own meter.
What does Zernio’s “marketing infrastructure” relaunch change?
Alongside social publishing, the inbox, and analytics, one Zernio key now sells ads on nine networks, phone numbers, SMS, calls, WhatsApp, and iMessage, each priced separately from the account fee. Its October 29 update added GA4 reports, automated ad rules, and post approvals. The per-account price did not change, though outbound messaging gained a usage charge on October 1, 2026, and running ads past 500 are metered too. It still sells no AI content generation, and Blotato’s scope stays narrower on purpose: social, on a flat plan.
Who are Blotato’s main competitors?
Zernio and Postiz are the two closest. Zernio competes as per-account marketing infrastructure that now sells paid ads and telephony as well as social, and Postiz as an open-source scheduler you can self-host. Ayrshare and Upload-Post sit in the same API category. Blotato’s difference is one flat plan for the whole social loop, from publishing to Instagram and Facebook DM automation, and its limits are nine platforms and an engagement surface that stops at Instagram and Facebook.
How many MCP tools do Zernio and Blotato expose?
Zernio’s server at mcp.zernio.com/mcp exposes 496 tools, 20 hand-built core tools plus one generated per API endpoint, with about 50 visible by default and the rest found through a search tool. Blotato’s at mcp.blotato.com/mcp exposes 35 tools by the live server’s own list, covering publishing, scheduling, analytics, comments, DMs, and DM automations (its tools reference lists the same 35; both checked October 20, 2026). More tools means more of the API is reachable, not that any single job is easier.
Can I use Zernio or Blotato with Claude?
Both ship hosted MCP servers, so either works with Claude Desktop, Claude Code, and other MCP clients. Zernio’s is at mcp.zernio.com/mcp and Blotato’s is at mcp.blotato.com/mcp. Neither has an exclusive here, and most serious tools in this category now ship one.
Does Blotato have a free plan?
No. Blotato runs a 7-day trial on every plan, a card is collected at signup, and you can cancel anytime. The trial also excludes API access, and generating an API key ends the trial and starts the paid Starter plan. Zernio does have a permanent free tier at two accounts.
Which tool supports more social platforms?
Zernio, at 16 publishing platforms against Blotato’s nine, a count its homepage, agents page, llms.txt, and docs agree on. Those 16 take in WhatsApp, Telegram, Discord, Slack, Google Business, and a Snapchat integration still in closed beta, plus Reddit, which its llms.txt says is switched off for now, so it is not 16 social networks. The 32 in its docs is a wider total that also counts its ad, telephony, and blog integrations. If a specific platform is a hard requirement, check Zernio’s list first.
Does Zernio charge extra for posting to X (Twitter)?
Yes. Zernio passes X API usage through per request at X’s own rates with no markup: $0.200 for a post containing a URL, $0.015 for a plain post or a DM send, and $0.005 for a read, all outside the account price you budgeted. A link post costs more than thirteen plain ones, so a thousand link posts a month adds $200. Blotato includes X publishing in the plan and does not bill it per request.
Does Blotato publish an uptime SLA or a status page?
No to both, and Zernio’s page is right about that. What Blotato does publish is the API rate limit, 30 requests a minute on the publish endpoint, which is what makes the “undocumented” claim wrong. Zernio’s own uptime figure changes by page, 99.97% on its comparison page and 99.7%+ in its pricing FAQ, with no SLA document behind either.
Is Zernio or Blotato better for agencies?
It depends on your client count. An agency in the 7 to 20 or 27 to 40 account bands pays less on Blotato and gets content generation included, which is the model I broke down in how to start an AI social media agency. An agency above forty accounts pays less on Zernio for publishing, though it will need a separate content tool. If each post needs an approval step inside the publishing API, Zernio’s post approvals cover that and Blotato has no approval step. Work out your account count first, then compare the combined bill rather than the publishing line alone.