Slither Pro is the most complete Slither.io extension on the market. It runs entirely client-side in your browser, ships with zero tracking, and includes a free baseline that’s already richer than most paid alternatives — plus a Pro tier that unlocks a serious AI bot.
Lives at slitherpro.xyz with its own marketing site, install funnel, and Stripe-backed billing. This page is the maker’s view; click through for the full product story.
In the box (free for everyone)
- 40+ custom skins with a live, in-game picker — try them mid-game
- Live chat — talk to other players running Slither Pro
- Smart zoom — adaptive camera that scales with your snake
- Live HUD — kills, length, position, FPS, latency
- Minimap — the whole arena at a glance
- Death recap — see who killed you and how
Pro tier
The Pro subscription unlocks a multi-goal scored decision engine for the AI bot:
- 16-sector predictive collision avoidance — anticipates threats and routes around them
- Adaptive strategy — shifts gameplay as your snake grows from sprint to king-of-the-arena
- Dedicated coil-survival system — the hardest situations in the game, handled
- Re-verification with the server every popup open and every Slither.io load — no offline cheating
- Cancel anytime through the Stripe billing portal, accessible directly from the popup
The free tier (skins, chat, zoom, HUD, minimap, death recap) keeps working regardless.
Privacy & integrity
- Zero data collection — no browsing history, keystrokes, clicks, IPs, or PII
- Preferences live locally via
chrome.storage - The only externally-handled data is your email when you subscribe to Pro (handled by Stripe)
- Reproducible builds — every release ZIP ships with a SHA-256 fingerprint, and the bot runtime hashes its own code on load and refuses to start if anything was tampered with
- Full checksums published at
slitherpro.xyz/downloads/checksums.json
Browser support
Manifest V3, so anything Chromium works:
- Chrome — installed from the Chrome Web Store
- Firefox 142+ — installed from Mozilla AMO
- Edge — works via the Chrome Web Store install
- Brave / Opera / Vivaldi — install via Chrome Web Store
Mobile browsers don’t fully support MV3 yet — Slither Pro is desktop only.
How the AI bot is built
The decision engine evaluates four channels every frame: food value, threat proximity, kill opportunities, and escape routes. Each is scored, the top action wins, with hysteresis to avoid jittering. The collision-avoidance system pre-computes 16 directional sectors and casts predictive trajectories outward — it sees danger seconds before a human would.
It’s the kind of system that’s only worth building if you actually play, and play seriously. (Yes, the maker plays.)