Sydium
Verified Oct 15, 2026 ActiveLearns your writing voice from past posts, then drafts, schedules and answers comments across eleven social platforms
Listed on EffectHub ·
Pricing
- Pricing model
- Paid
- Paid options from
- $28/mo
- Billing
- Monthly
Pro $28/month billed yearly ($35 month-to-month) for 300 AI-generated posts and 5 autopilot accounts; Agency $79 yearly ($99 monthly) for 800 posts, 20 accounts, 10 seats and 20 client portals; Enterprise $499 yearly with custom terms. No free tier; the 14-day trial requires a card but charges nothing until day 14.
Use tool ↗About Sydium
Sydium is a social media workspace built around a trained brand voice: it reads your past posts, website and brand documents and drafts posts and comment replies in that register. Around the voice sit a composer for eleven platforms including Bluesky, Threads, Mastodon and Google Business, image, video and carousel studios, a unified inbox, analytics and per-client workspaces with approval links. Developers get a REST API, a CLI and an MCP endpoint, and a Chrome extension saves pages into the idea list. Plans are metered in AI-drafted posts; there is no permanent free tier, and the 14-day trial needs a card. It is built by a solo founder in Romania.
- Platforms
- Web · API · Chrome extension
- API
- Yes
- Last verified
- Oct 15, 2026
Verified sources
- Pro $28/mo billed yearly or $35 monthly (300 AI posts, 5 autopilot accounts), Agency $79/$99, Enterprise $499/mo yearly; no free plan, 14-day trial with card upfront (15 October 2026)sydium.com ↗
- Composer for eleven platforms incl. Google Business, REST API, CLI and MCP endpoint, Chrome extension, video generation billed separately in credits, built solo in Brasov, Romania (15 October 2026)sydium.com ↗
Is Sydium legit?
We don’t label tools safe or unsafe. Below are the records we checked ourselves, each with the date we read it.
- Domain registered
- Nov 13, 2025Registry record (RDAP), registrar Cloudflare, Inc., looked up Sep 6, 2026
- TLS certificate
- Issued by Google Trust Services, valid until Dec 4, 2026Seen in our own connection to the site on Oct 15, 2026
- Last checked
- Oct 15, 2026The site answered
- Operated by
- Sydium, RomaniaOur research, card verified Oct 15, 2026
Pros & cons of Sydium
Counting plans in posts instead of opaque credits is refreshing, and the voice training plus an eleven-platform spread including Bluesky, Threads, Mastodon and Google Business covers more ground than most schedulers. The thing to weigh is concentration risk: this is one person's product, and the top tier sells a priority line to that person.
Pros
- Trains on your existing posts and site content before drafting
- Eleven platforms including Bluesky, Threads, Mastodon and Google Business
- Plans metered in posts, with manual posts uncapped on every tier
- Agency tier adds seats, approvals and branded client portals
- REST API, CLI and MCP access for posting from scripts or an AI assistant
Cons
- No free tier at all
- Trial requires a card up front
- Single-founder product, so support and roadmap depend on one person
- Video generation is billed separately in credits on top of the plan
Best for
- Founders and solo operators who want posts that sound like them
- Agencies needing client portals, approvals and multiple autopilot accounts
- Teams publishing to newer networks such as Bluesky, Threads and Mastodon
Not for
- Anyone wanting a free tier to test with
- Enterprises that need vendor continuity guarantees
Watch out: Headline prices assume annual billing; month-to-month is $35 and $99, and the trial charges automatically on day 15 unless cancelled.
Alternatives to Sydium
Sydium head-to-head
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