Everything it does, in full.
The same seven jobs as the homepage, with every part of each one and the pages that go deeper. Where there is something to show, it is the real app, recorded.
An account and your first drafts need no card. The 14-day trial on Pro and Agency needs one: $0 today, cancel before day 14 and pay nothing.
1 · Voice
It sounds like you, in posts and replies.
Learned from what you have already published, then used by everything below.
Start with what you have already written
Your posts, your website, your brand documents: it learns cadence, vocabulary, point of view. Paste posts you admire and it reads their traits. Nothing written yet? Type answers to five questions about your work.
How brand voice worksAdd your own rules
Words to always use, words to avoid, who you are writing for, how you sign off.
One voice per brand, or per client
The same voice writes the post, the carousel, Muse's captions and the suggested reply to a comment. The edits you make to its drafts shape the next ones.
The editor pass, on a real draft
The editor cut one sentence, the 'not because X, because Y' inversion, and left everything else alone.
Slack notification while I was three functions deep into a bug in the queue worker.
Answered it in maybe forty seconds. Came back, stared at the file, and had no idea why I'd opened it.
Scrolled up. Read my own code like a stranger wrote it. Ten minutes to rebuild the mental picture of what was calling what.
The message was someone asking if I'd seen their earlier message.
I keep the phone in the other room now. Not because I'm disciplined. Because I lostLost that bug for the rest of the afternoon and never found it again.
#buildinpublic #solofounder #devlife #Sydium
Struck through: cut by the editor. Lime: what it stitched in.
Generated by the production pipeline in a real brand voice, then rewritten by the same editor pass that runs on every caption. Neither side was written by hand, and the pair is shown in English in every language for that reason.
2 · Ideas
Three ideas a day for what to post.
Three ideas a day from what people search around your niche, one click into the composer.
Three ideas a day
From what people search around your niche, not a trend feed. Open one and it is a brief: the angle, the hook, what to show.
Into the composer in one click
The idea lands in the writer with its brief. Generate, and the caption is in your voice. What you use, save or dismiss steers the next ideas.
Set from your site
It reads your website and proposes your niche. Change the categories, the keywords and the topics it must avoid whenever you like.
Your own ideas, kept
Type one, drop in an image, or record a voice note: it is transcribed and shaped into a topic, an angle and a platform, with the filler taken out and nothing added. The Chrome extension saves a page into the same list.
3 · Make
The picture, the video and the deck, in the same window.
The image, the video and the carousel, made and edited inside the post.
Image Studio
Describe the image, then edit it by typing: remove the background, extend the frame, warmer light. Colours and style come from your own site and posts.
Video Studio
Trim on one timeline, cut the silences, burn in captions from the transcript, lay a track under it. Close the editor and the finished video is on the post. There is no export step.
Carousel Studio
Writes the slides, designs them in one of six styles, and attaches the result in each platform's format: a carousel on Instagram, a PDF document on LinkedIn, a 9:16 photo post on TikTok.
Generated video, when you need it
A clip from a description, from a still, or from one to three reference images, with sound, up to thirty seconds. Billed per second in credits, separately from the plan; the first short clip is free on a trial or a paid plan.
4 · Publish
One composer, eleven previews.
Written once, previewed and adapted per platform, scheduled the way you work.
Written once, adapted per platform
Each platform's own preview and settings: TikTok's privacy, YouTube's visibility, a LinkedIn document, a Google Business call to action. One click adapts the wording for each; you review the changes.
See the schedulerNow, later, in a queue, or on repeat
Schedule to the minute, drop it into a recurring slot, or set a post to repeat. A calendar by month or week, and Instagram's grid the way it will look.
Autopilot, when you want it
It drafts the coming week per brand and you review every post, approve a batch once a week, or let it publish. Change the mode or pause it whenever you like.
How Autopilot worksRepurpose and split
Start from a post that worked, or from the library, the calendar or an idea, and get a version for each platform. Paste a blog article and get five to fifteen posts out of it.
A page for the link in your bio
Your links and social icons at syd.ac/yourname; on Pro, also your latest posts, a post grid, an email signup and a YouTube embed.
5 · Reply
The comments, in one inbox, with a reply drafted in your voice.
Comments from eight platforms and DMs from two, with a reply drafted in your voice.
Comments and messages, together
Comments from eight platforms, DMs from Instagram and Facebook, one thread per conversation. Reply to comments on seven of them from the same screen; Bluesky is read-only.
Suggested replies that sound like you
Drafted from your voice and the recent conversation. Send it, or edit it first.
A keyword sends the link
Someone comments a keyword, they get the link by DM. Notes and tags for the people you want to follow up with.
Leads
The people who comment and message you, scored 0 to 100 by how often and how deeply they engage, with the intent read from what they wrote: a question, purchase interest, a complaint, a mention of a competitor. Their whole history in one place, with your tags and notes. Intent detection is on Pro and up.
Giveaways
Pick a post on Instagram or Facebook and everyone who commented is a participant. Draw a winner at random, with an audit trail of the draw.
If your first month doesn't sound like you, we retrain your voice free and refund the month.
An account and your first drafts need no card. The 14-day trial on Pro and Agency needs one: $0 today, cancel before day 14 and pay nothing.
6 · Measure
See what worked.
What each platform reports, a report you can send, and competitors beside you.
Per platform, per post
The metrics each connected platform reports, per post and over time; your top posts, sortable; one click to repurpose the best of them. X shows what its public counts allow.
A report you can send
A link with an expiry and a password, a PDF, a CSV. On Agency, a monthly report emailed to a client.
Compared with other accounts
Track up to six Instagram or YouTube accounts and compare cadence and engagement side by side. Instagram needs a business account connected through Facebook.
7 · Clients
Running it for other people.
A workspace, a voice and a portal per client, and approvals through a link.
A workspace per client
Its own connected accounts, its own trained voice, and its own daily ideas if you switch them on. Twenty workspaces on Agency.
They approve through a link
A client, a founder or legal: approve, reject or ask for a change from an email link, without a Sydium account. Two levels if your team checks first. Every decision on the record.
A portal in your branding
Their approvals, their reports and their engagement, under your logo and colours. The report itself carries the client's name and ours.
Deadlines and who signs
A deadline with email reminders and, if you choose, a post past its deadline goes through on its own. One of several people can sign, or all of them. A change request comes back with its comment, and the scheduled time can be moved from the review page.
Roles for your team
Owner, admin, editor and viewer, and a permission matrix to change what each can do: create, publish, approve, manage the team, manage billing.
Use it from ChatGPT or Claude.
Connect either one, or any client that speaks MCP, and post, schedule, draft a carousel or read your analytics from there. Developers get a REST API and a CLI.
The Chrome extension saves any page or selected text into your ideas. Get it for Chrome ↗
Read the developer docs →All of it, from one free account.
An account and your first drafts need no card. The 14-day trial on Pro and Agency needs one: $0 today, cancel before day 14 and pay nothing.
If your first month doesn't sound like you, we retrain your voice free and refund the month.
No form, no call. Email us and it's done. You are the judge.