S4L login: how to actually sign in to s4l.ai

If you typed “s4l login” into Google, you may have meant a swim school, the Sim4Life simulation suite, or a shipping portal that all happen to share the S4L initials. This page is about a different one: s4l.ai, the Reddit and X/Twitter engagement plugin and the open-source autoposter behind it. The reason a single sign-in box does not exist here is that “logging in” means different things depending on whether you bought the plugin or run the repo yourself.

The three doors behind s4l.ai/login

The sign-in page is a router, not an auth wall. Here is what each path expects from you.

If you bought the plugin

The Plugin Access path is the closest thing S4L has to a conventional login. The subscription runs through Stripe, and the plugin download unlocks for the email address used at checkout.

Lost the email? Contact support from the address you used at checkout. There is no separate public password reset because plugin access is tied to the subscription email.

If you self-host: there is no S4L password to find

This is the part no other page about this topic explains, because no other page is about this S4L. When you run the open-source autoposter (the same engine the desktop plugin packages), you never create an S4L account. Two things stand in for a login, and both live on your own machine, not on a server you sign into:

~/social-autoposter/.env
  AUTOPOSTER_API_BASE = <hosted S4L API>
  # an install key, not an S4L username or password

~/.claude/browser-profiles/
  twitter/   # your own X/Twitter session, persisted
  reddit/    # your own Reddit session, persisted

The first thing is an install key in ~/social-autoposter/.env. Per the repo README, state (posts, replies, candidates, stats) is read and written through the hosted S4L HTTP API using AUTOPOSTER_API_BASE plus that key, so there is no database to provision and no console to sign into.

The second thing is your own platform sessions. Each platform drives its own persistent browser profile under ~/.claude/browser-profiles/. The README is blunt about it: “The first time each platform runs you’ll be asked to log in once; cookies persist into the userDataDir.” So the only login that happens is you logging into Reddit and X/Twitter as yourself, once, locally. You can verify both facts in the README at github.com/m13v/social-autoposter.

The practical upshot: if you are hunting for an S4L password and you are on the self-host path, stop looking. There is not one. Your credentials are your own Reddit and X accounts, held in a browser profile on your disk.

And if you use founder ghostwriting?

Founder tweet ghostwriting uses handles you already control. S4L does not give you a separate posting account to log into and it does not post from its own handle. You stay the owner of record.