Crossagent.si
@mention any AI from inside any other AI
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Details
- External ID
- 1270757
- Source
- PH
- Company
- —
- Product
- Crossagent.si
- Website domain
- producthunt.com
- Launched
- Oct. 6, 2026
- Cohort
- —
- Upvotes
- 2
- Upvotes percentile
- 0.7630403573137662
- Tags
- Browser Extensions, Chrome Extensions
- Fetched at
- Oct. 7, 2026, 1:01 a.m.
- Updated at
- Oct. 7, 2026, 1:01 a.m.
Description
Hey PH, I built Crossagent in 3 days because I was tired of being my own copy-paste middleware between AI tabs. The core idea: type @claude inside ChatGPT, and Claude responds in a sidebar using your own account. No API key. No proxy. Completely native. Type @all, ChatGPT, Claude, Gemini, Perplexity, Grok, Mistral, and Copilot all answer at once, then Claude synthesises. Would love brutal feedback on what's broken, what's missing, and what would make you actually use this daily.
Enrichment
- Niche
- AI search visibility and optimization
- Vertical
- Horizontal
- Function
- Agent / copilot
- Audience
- Developer
- AI stance
- AI-native
- Project type
- Commercial product
- Normalized one-liner
- multi-agent mention tool for ai assistants
- Manually corrected
- False
Could you build this?
Partial A basic browser extension injecting a sidebar is approachable, but natively session-jacking or injecting interactions across authenticated third-party web apps (ChatGPT, Claude, Gemini) without official APIs is brittle and technically complex due to DOM changes, CSP, and auth state management.
What it would actually take: The architecture relies on a Chrome Extension (Manifest V3) running content scripts that inject custom UI overlays and observe input events. To communicate without API keys, it must parse authenticated web sessions via background service workers, bypass CORS/CSP boundaries, and programmatically simulate chat requests against internal web client endpoints while constantly adapting to anti-bot measures and frequent frontend DOM changes.
Competitors
Other products that read as similar to this one — 500 launches clear the similarity bar, closest 8 shown.
Attention rank: #129 of 501 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 342 days after the earliest competitor.
- WhileAI · ph · 2026-09-28 · 1 upvotes · similarity 0.54
- PolyGPT · hn · 2025-11-22 · 26 upvotes · similarity 0.54
- 4 in 1 ai · ph · 2026-10-07 · 1 upvotes · similarity 0.52
- Multi-Ai-Chat-Desktop · ph · 2026-09-14 · 2 upvotes · similarity 0.52
- CreatorChat · ph · 2026-10-07 · 3 upvotes · similarity 0.52
- Mysti · hn · 2025-12-23 · 216 upvotes · similarity 0.51
- Claude-codex-proxy · hn · 2026-04-19 · 7 upvotes · similarity 0.50
- openchats · ph · 2026-10-05 · 2 upvotes · similarity 0.49
Other launches for this product
- No other launches for this product.
Same idea, different domain
Nobody's really built a agent / copilot tool for Agriculture yet.