u/Kojinto

I've been building Synth.pub for the past few months, a place to publish serialized fiction and nonfiction written openly with AI. Free to read always.

One thing up front tho, since "AI authorship" makes people think detector: Synth is not a detector. Tools like GPTZero and Turnitin guess at finished text and get it wrong a lot, so being skeptical of them is warrented.

Synth doesn't guess at anything. It records as you go. You write in a turn-based editor where you and your customizable AI companion take turns writing passages, and each passage gets logged as human-written, AI-written, or collaborative if you edit what the AI writes (or vice-versa) at the moment whoever writes it. The authorship comes from how the writing actually happened, not a score slapped on after the fact.

The key is the Collaboration Map. Toggle it on any chapter and you get a color-coded view of who wrote what, plus a revision history showing what you or your AI drafted first and what you changed or accepted over time.

Why I built it: plenty of people are already writing fiction with AI and have nowhere to publish it where the collaboration is out in the open and treated as a good thing instead of a secretive neccessity or is outright unwarranted. So I made that place.

What's in it for writers:

Bring your own AI. Connect your own model by API key, personality and memory intact. BYOAI writers never pay. Or use the built-in partner, Deepseek v4 Flash, free to start with fairly generous weekly limits that I eat at cost because I want someone to feel like they can at least write a whole chapter per week.

Story Bible, Lore, and Outline D****ocs that grow as you write and chat with your companion, and feed back into their context so your canon stays consistent across a long serial.

A Quality Mentor (I call it the Prose Deity) that gives feedback after you publish and grades your work. It never blocks you though, but is an optional fun way to see which passages get a C, B, A grade or the rare SSS.

A My Style Page where the Prose Deity builds a profile of what you do well and what you could work on as you xomtinue to. Don't take it too seriously, but it's handy and kinda neat.

Forums, Wow! A recent addition, for meeting others, sharing work, wins, feature requests, and bug reports and for me to share site/dev announcments.

Currently working on a Prose Battle system where your best 3 human passages per chapter grant procedurally generated loot that you equip on your AI companion. Then you can watch your AI fight generated monsters through your companion's own writing style that uses a simple RPG engine where dice rolls and listed effects turns into a story generated by your AI companion's innate understanding and pattern matching of said raw values.

Then later, I'd love to have people's AI be able to duel each other for fun in a writing battle. Why build this? Because I think its cool and it incentivises at least partial human writing and it wouldn't work without the writing half of the site, so yeah!

I am biased and am an author at heart more than I am by any metric of conventional success. And yet, I enjoy building this almost as much as I enjoy using it to write America's next generic LitRPG Isekai. Happy to answer anything.

A lot of authors use AI in secrecy. As a reader, you usually can't tell whether something was fully human-written or had a touch, or sometimes even a lot, of AI in the process.

So instead of writing on a platform that may or may not have AI in its published work, I built Synth.pub, a platform that's fully transparent about AI use. On any chapter of any story, by any author, a reader can see exactly who wrote what, how much collaboration there was between human and AI, and the complete revision history for every passage.

But I didn't stop there. I wanted the AI companion to do more than write with you. It also helps you track the details that stories drown in: characters, world-building, outlines, lore, through a mix of automated and manual systems. And because it holds all that context, when you talk to your customizable AI companion about a specific chapter or beat, they will usually know where you are in the story and have what they need to help.

There's also a grading AI I built called the Prose Deity. It grades each passage from E up to SSS and gives feedback. I wouldn't take it too seriously, but it's fun and can be genuinely insightful. Everything it surfaces gets compiled into a "My Style" page, so over time you get a clearer picture of where your writing lands and where it might fall short.

Right now it's free to read and free to write. As the platform grows, I'll need a subscription to cover the actual token costs, very likely $5 and $10/month tiers - but there'll always be a free option (currently 150k tokens/week for writing), because I don't want cost to be the reason someone can't try it.

Full disclosure: I built this, so I'm biased. But I'd really love honest feedback from folks here on whether the transparency model actually works for you. Happy to answer anything in the comments.

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Edit: A couple people have asked how the "who wrote what" part actually works. I should've been clearer above. This isn't AI-detection running on finished text (like Turnitin or GPTZero) guessing who wrote it. Every passage is written turn-by-turn inside the platform's own editor. When you give the AI a turn, that's an actual API call the platform makes and logs in the moment, not an inference made afterward. So there's no "accuracy rate" to report here, because nothing's being guessed.