The workspace where teams build together with AI.
Additional is where your team, your tools, and any AI model think together in real time, with shared context, in one place.
The only workspace that's multiplayer and model-agnostic
Everyone uses AI alone, in separate tabs, copy-pasting context back and forth and losing every decision the moment they close the window. Additional brings your team, your tools, and any model into one shared space.
ProductCollaborate
Multiplayer AI, in real time. Everyone prompts, reacts, and branches in the same session.
Connect
Your tools, read live. Notion, Slack, Linear, Drive... No copy-paste.
Compound
Every session makes the next one smarter. Your context, persisted.
a.
One workspace
Everything in one place. No more 10 tabs
b.
Model-agnostic
Any AI model, never locked to one
c.
Branching
Explore ideas in parallel, in one session
d.
Compounds
Smarter with every session you run
No one else sits in this corner.
Rivals are bolting these on one at a time group chats here, a model picker there, a few connectors. Additional is the only one built with all of it, as a real multiplayer workspace.
ChatGPT
Claude
Multiplayer, Claude Tag
Microsoft Copilot
Google Gemini
Additional
Notion AI
Slack AI
Glean
Full
Partial / limited
None
Plug in your stack. The AI reads it live.
Connect the tools your team already uses in a click. Additional pulls real context straight from the source no copy-paste, no exports.
Integrations
Notion
Slack
Linear
Google drive
+ more every month
Your team's context stays yours.
Additional is built with security at the core. Your data is never used to train models, and you control exactly what the AI can see.
SecurityYour data stays yours
Never used to train models. Encrypted in transit and at rest, isolated per workspace.
Permission-aware connectors
Connector respects the source's permissions. People only ever see what they already can.
Enterprise controls
SSO, SAML, audit logs, and BYOK for teams that need them.
AES-256 · TLS 1.2+ · GDPR-aligned (EU hosting) · SOC 2 Type II (in progress)