OnlySocial’s REST API and 24-tool MCP server create, schedule and queue posts. Its unified inbox lives in the dashboard. SocialAPI.ai puts comments, DMs and Google reviews behind one API key and a 75+ tool MCP server, free for 2 brands.
TL;DR
SocialAPI.ai is an OnlySocial alternative for developers who need the inbox in code. OnlySocial’s REST API and MCP server cover posts, media, tags and workspaces, while comments, DMs and reviews stay in its dashboard. We expose all three through one REST API and 75+ MCP tools. For a branded scheduler your team clicks through, OnlySocial is the better buy.
The honest answer, before we get into specifics about OnlySocial.
Positioning
OnlySocial is an all-in-one social media manager for creators, freelancers and agencies. It publishes to 15 networks, including Reddit, Mastodon, Tumblr and VK, and bundles a unified inbox with assignments and saved replies, Facebook and Instagram chatbots, comment automation, email and SMS broadcasts, link-in-bio pages and AI captions. Plans run $29/mo (Freelancer, 15 social profiles), $49/mo (Entrepreneur, 40) and $99/mo (Unlimited Pro, unlimited profiles, 10 team members), with a free trial. A white-label edition starts at $97/mo for 10 client workspaces and lists API access on every tier.
SocialAPI.ai is a unified REST API for reading and answering comments, DMs, Google Business Profile reviews and mentions across 13 platforms, plus publishing, signed webhooks and an MCP server with 75+ tools for AI agents. The billing unit is the brand: one client with all of its accounts. Reads are free on every plan, paid plans leave posts and interactions uncapped, and the free Hobby plan covers 2 brands with no card. It is built to sit inside your product, behind your own UI.
OnlySocial ships a real unified inbox: DMs, comments and reviews from Facebook, Instagram, Threads, YouTube, Google Business, LinkedIn, Reddit, Mastodon and Bluesky, with assignments, notes and saved replies. Your code cannot reach it. The REST API documents accounts, media, tags, posts, groups, users, workspaces and subscriptions, and the MCP server’s 24 tools stop at workspaces, accounts, posts, tags and media. If your product or agent has to read a comment and answer it, that is the whole comparison. Here it is POST /v1/accounts/:id/interactions/:iid/reply, the same call for a comment, a review or a mention, and listing interactions never counts against a limit.
At a glance
Feature matrix
| Feature | SocialAPI.ai | OnlySocial |
|---|---|---|
Publishing | ||
| Publish & schedule posts | ||
| Networks covered | 13 platforms | 15 networks (incl. Reddit, Mastodon, Tumblr, VK) |
Engagement | ||
| Read & reply to comments via API | Dashboard only | |
| Direct messages (read + send) via API | Dashboard only | |
| Reviews (read + reply) via API | Google Business Profile | Dashboard only |
| Comment moderation (hide, delete) via API | Dashboard only | |
| Webhook events for new interactions | signed, 5 retries | Not documented |
Developer experience | ||
| Authentication | API keys + OAuth 2.1 with PKCE | Personal access token |
| Connect social accounts through the API | POST /v1/accounts/connect | Dashboard or client connect link |
Pricing | ||
| Billing unit | Per brand (one client) | Per social profile; per workspace on white label |
| 10 clients, one space each | $29/mo | $97/mo (WL 10) |
| Posts & interactions on paid plans | uncapped | Unlimited scheduling |
| Way to start | Free Hobby plan, 2 brands, no card | Free trial, no card |
AI agents | ||
| MCP server for AI agents | (75+ tools) | (24 tools) |
| Inbox tools over MCP (comments, DMs, reviews) | publishing and workspace tools only | |
| Agent can connect accounts itself | OAuth 2.1 + PKCE | token pasted from the dashboard |
Show, don't tell
# Reply to an Instagram comment. The same call answers
# a Google review or a mention. Reads are always free.
curl -X POST "https://api.social-api.ai/v1/accounts/acc_ig_42/interactions/int_9f3/reply" \
-H "Authorization: Bearer sapi_key_..." \
-H "Content-Type: application/json" \
-d '{"text": "Thanks! Your order ships Monday."}'# OnlySocial's API is publishing-first: create a post in a workspace.
# No documented endpoint lists or answers comments, DMs or reviews.
curl -X POST "https://app.onlysocial.io/os/api/<workspaceUuid>/posts" \
-H "Authorization: Bearer <token>" \
-H "Content-Type: application/json" \
-d '{"accounts": ["123"], "versions": [{"account_id": 123, "is_original": true, "content": [{"body": "Launch day"}]}]}'Both APIs publish. Only one of them can read the comment that post attracts and answer it, and that is the call your product or agent makes every day.
Pricing
Both columns give every client its own space: a brand here, a workspace on OnlySocial’s white-label plans, which are built as one workspace per client and are the tier that lists API access. Run everything from a single workspace instead and Unlimited Pro is $99/mo for unlimited social profiles and 10 team members, less than our Full Send plan and the right buy for publishing alone. No OnlySocial price buys comments, DMs or reviews through the API, and that is the part you pay us for.
Scale
10 clients, a space each
SocialAPI.ai
$29/mo (Side Hustle)
OnlySocial
$97/mo (WL 10), 3.3x more
Scale
25 clients, a space each
SocialAPI.ai
$109/mo (Full Send)
OnlySocial
$197/mo (WL 25), 1.8x more
Scale
100 clients, a space each
SocialAPI.ai
$349/mo (Empire)
OnlySocial
$499/mo (WL 100), $1,800/yr more
Decision guide
Your backend lists new interactions, routes them and posts replies without anyone logging into a dashboard. OnlySocial documents no endpoint for comments, DMs or reviews, so the only way to answer one is a person in its inbox. Here it is one REST call, and signed webhooks tell you when to make it.
Pick SocialAPI.aiOur MCP server exposes 75+ tools, including reading and replying to comments, DMs and Google reviews. OnlySocial’s 24 tools draft, schedule, queue, tag and trash posts. An agent on their server can announce a launch but cannot see the replies it gets.
Pick SocialAPI.aiOnlySocial’s white label gives you your logo, colors and custom domain, a shared content calendar with approvals, a client connect link, and a billing module that charges your clients through Stripe, Paddle or Paystack, from $97/mo for 10 workspaces. We sell an API, not a dashboard to resell.
Pick OnlySocialOnlySocial publishes to 15 networks, including four we do not connect, and adds AI captions, link-in-bio pages and email and SMS broadcasts from $29/mo. If publishing from a calendar is the job, it covers more of it for the money.
Pick OnlySocialMigration
Map each workspace to a brand
One OnlySocial workspace per client becomes one brand here. Ten clients fit Side Hustle at $29/mo, 50 fit Full Send at $109/mo, however many networks each one runs.
Reconnect accounts through OAuth
Access tokens do not transfer between vendors. Each account reconnects once through official platform OAuth, and POST /v1/accounts/connect lets your own app or agent start that flow.
Move the inbox first, keep the calendar
Point your code at the comments, DMs and reviews endpoints and register one webhook. Nothing forces a publishing switch on day one: keep scheduling in OnlySocial until POST /v1/posts covers what you need.
FAQ
If you need comments, DMs or reviews in your own code, SocialAPI.ai: one REST API and a 75+ tool MCP server across 13 platforms, from $0 for 2 brands and $29/mo for 10. If you want a scheduler with a calendar, AI captions and a white-label dashboard, OnlySocial itself is hard to beat at $29 to $99/mo.
Yes. It is a REST API at app.onlysocial.io/os/api, authenticated with a personal access token created in the dashboard. It covers accounts, media, tags, posts (create, schedule, queue, approve), groups, users, workspaces and workspace subscriptions. As of 30 September 2026 its reference documents no endpoint for comments, DMs or reviews.
Yes, a built-in server at app.onlysocial.io/os/mcp over streamable HTTP, with 24 tools for workspaces, accounts, posts, tags and media. It respects workspace roles and post approval. It has no inbox tools, so an agent can publish through it but cannot read or answer comments and DMs. Ours exposes 75+ tools, the inbox included.
Freelancer is $29/mo for 15 social profiles and 2 team members, Entrepreneur is $49/mo for 40 profiles and 4 members, and Unlimited Pro is $99/mo for unlimited profiles and 10 members. Paying yearly costs $290, $490 or $990. The white-label edition runs $97/mo for 10 workspaces, $197/mo for 25 and $499/mo for 100.
It depends on the job. With a workspace per client, the setup where OnlySocial lists API access, we cost less at every size: $29 against $97 for 10 clients, $349 against $499 for 100. For publishing from one workspace, Unlimited Pro at $99/mo undercuts our $109 Full Send plan. Neither of their prices includes inbox access through the API.
Yes, and it is the safest way to switch. Connect the same accounts here, run comments, DMs and reviews through our API and webhooks, and keep scheduling in OnlySocial for as long as you like. The free Hobby plan covers 2 brands for the trial, with no contract on our side.
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