Zernio API alternative
Socialync API vs Zernio
Zernio is a social media API, formerly Late (getlate.dev). Here is its price and what it does, next to the Socialync API. Every Zernio figure was read on its own site on November 9, 2026.
The short version
Zernio pricing on its pricing page: the first 2 connected accounts are free with the full API, then $6 a month per account for accounts 3 to 10, $3 for accounts 11 to 100 and $1 from the 101st. Ten accounts cost $48 a month. X (Twitter) API costs are passed through at X's own rates with no markup.
The Socialync API is included on every Socialync plan. The free plan allows 5 posts a month on 7 networks, and X needs a paid plan. Paid plans start at $20 a month for 5 connected accounts, $30 for 10 and $62.60 for 30. It posts to 8 networks with one key and plain JSON.
Price at 5, 10 and 30 accounts
Zernio bills per connected account, graduated. The first 2 accounts are free, accounts 3 to 10 are $6 each a month, accounts 11 to 100 are $3 each and 101 and up are $1 each. Each band prices only the accounts inside it. Every feature is on every account.
Socialync bills per connected account. One connected account is one social account, so three Instagram accounts count as three. The first 5 are in the $20 base, accounts 6 to 25 are $2 each and accounts above 25 are $0.52 each. The base price includes 1 X account, and each extra X account is $10 a month.
Zernio and Socialync both bill per connected account, so it does not matter how the accounts are spread. The Socialync prices assume at most one of the accounts is on X.
| Monthly price | 5 accounts | 10 accounts | 30 accounts |
|---|---|---|---|
| Socialync | $20API included | $30API included | $62.60API included |
| Zernio | $182 free, then per account | $482 free, then per account | $1082 free, then per account |
Monthly billing, USD, taxes not included. Zernio prices read on November 9, 2026. Yearly billing, where a vendor offers it, costs less. Check the current price before you decide.
- No plans and no seats. Every feature is included on every account.
- Request limit: 60 requests a minute with 0 to 2 connected accounts, 600 with 3 to 2,000, 1,200 above that.
- Posting caps per account include 25 posts an hour, and a post over the hourly cap is held and published later.
- X API usage is billed separately at X's own per call rates, passed through with zero markup.
What each API can do
| Feature | Socialync | Zernio |
|---|---|---|
| Networks the API posts to | Partly. 8 networks. Pinterest is not one of them. | Yes. Its API reference covers 30 platforms. The social ones include Pinterest, Reddit, Snapchat and Google Business. |
| Webhooks | No. None yet. Poll GET /v1/posts for status. | Yes. Real time events for post status, messages and comments. |
| Comments | No. Not in the REST API. The Socialync MCP server can read and reply to comments. | Yes. Reply to comments and manage reviews. |
| Direct messages | No. Not in the REST API. | Yes. Read and send DMs. The first 10,000 sent a month are free, then metered. |
| Let your own customers connect their accounts | No. Accounts are connected by the key owner in the Socialync app. There is no connect flow for your users. | Yes. Give each customer a profile and post on their behalf. |
| Official SDKs | No. No SDK yet. Any HTTP client works, and there is an OpenAPI 3.1 document. | Yes. Clients for Node.js, Python, Go, Ruby, Java, PHP, .NET and Rust. |
| MCP server for AI assistants | Yes. On every plan, free included. | Yes. Hosted MCP server for Claude, ChatGPT, Cursor and others. |
What the Socialync API does not do yet
- Posts to 8 networks: Facebook, Instagram, LinkedIn, X, Threads and Bluesky as immediate posts, and TikTok and YouTube as scheduled posts. Pinterest is not supported.
- Immediate posts are text and up to 10 images. Video, TikTok and YouTube need scheduledAt, a few minutes ahead or later.
- No webhooks. Poll GET /v1/posts or GET /v1/posts/{id}.
- No comment or direct message endpoints in the REST API. The MCP server has comment tools.
- No endpoint to connect accounts. Accounts are connected in the Socialync app by the key owner.
- No SDK. The OpenAPI 3.1 document describes every endpoint.
- 60 requests per minute per key, the same as the MCP endpoint.
- No CORS headers: browsers cannot call the API. Keep keys on a server or in CI secrets.
Where Zernio fits better
- You connect only a few accounts. The first 2 are free and the next 8 are $6 each, so 5 accounts cost $18 a month, below the Socialync base price.
- You need webhooks, direct messages, ads or comments through the API.
- You build a product where each of your customers connects their own accounts.
- You need a typed client in a language with an official SDK.
A Socialync call
This publishes a text post to LinkedIn and Bluesky. It is the quickstart from the reference. The Idempotency-Key header makes a retry safe: the same key with the same body returns the first response for 24 hours. The key is the same one the Socialync MCP server uses.
curl -X POST https://mcp.socialync.io/v1/posts \
-H "Authorization: Bearer $SOCIALYNC_API_KEY" \
-H "Content-Type: application/json" \
-H "Idempotency-Key: $(uuidgen)" \
-d '{
"platforms": ["linkedin", "bluesky"],
"caption": "Shipped from a script."
}'Scheduling, media upload, drafts, analytics and error codes are in the API reference.
Frequently asked questions
How much does the Zernio API cost?
Zernio charges per connected account. The first 2 accounts are free. Accounts 3 to 10 are $6 a month each, accounts 11 to 100 are $3 each and the 101st and up are $1 each. That makes 5 accounts $18 a month, 10 accounts $48 and 30 accounts $108. Checked November 9, 2026.
Is Zernio the same as Late?
Zernio is the new name of the Late API. The old getlate.dev address now redirects to zernio.com.
Are there costs on top of the Zernio price?
Zernio says X (Twitter) charges per API call and that it passes those rates through with zero markup. Messages, calls, phone numbers and ads are metered separately. Posting, analytics, comments and webhooks are included on every account.
Does the Socialync API cost extra on top of a plan?
No. The Socialync API is included on every plan, the free plan too. The free plan allows 5 posts a month on 7 networks, and X needs a paid plan. Paid plans start at $20 a month for 5 connected accounts, and the 10 account price is $30.
What can the Socialync API not do yet?
It has no webhooks, no comment or direct message endpoints, no endpoint to connect accounts and no SDK. It posts to 8 networks and does not post to Pinterest. Immediate posts are text and images, and video needs a scheduled time.
Sources
Zernio facts were read on November 9, 2026 (price check November 9, 2026). Plans and prices change, so confirm on the vendor site.