Castari – The runtime for agents that need a computer
Your agent executes code, calls tools, and runs for hours. We give it a sandbox, an endpoint, and observability — with one command.
Details
- External ID
- 97921
- Source
- YC
- Company
- MadeThis
- Product
- Castari – The runtime for agents that need a computer
- Website domain
- madethis.com
- Launched
- Feb. 17, 2026
- Cohort
- Fall 2025
- Upvotes
- 5
- Upvotes percentile
- 0.046511627906976744
- Tags
- Artificial Intelligence, Operations
- Fetched at
- Sept. 30, 2026, 5 p.m.
- Updated at
- Sept. 30, 2026, 5 p.m.
Enrichment
- Theme
- developer tools for AI agents
- Vertical
- Horizontal
- Function
- Model & infra
- Audience
- Developer
- AI stance
- AI-native
- Project type
- Commercial product
- Normalized one-liner
- runtime sandbox for agent code execution
- Manually corrected
- False
Could you build this?
No Building a multi-tenant, secure runtime for code-executing agents requires low-level virtualization (e.g., Firecracker microVMs), Linux kernel isolation, memory snapshotting, and secure network sandboxing that AI vibe coding cannot reliably architect.
What it would actually take: Architecture typically relies on bare-metal servers running Linux KVM with Firecracker microVMs or gVisor container runtimes, managed by an orchestration layer written in Rust or Go. The primary technical hurdles are millisecond-latency VM initialization, copy-on-write root filesystems, tenant isolation against zero-day escapes, and WebSocket-based stream observability. Requires deep systems programming, Linux kernel, and virtualization expertise.
Competitors
Other products that read as similar to this one — 94 launches clear the similarity bar, closest 8 shown.
Attention rank: #94 of 95 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 96 days after the earliest competitor.
- Agent Action Runtime · ph · 2026-09-26 · 1 upvotes · similarity 0.46
- Castari - Vercel for AI Agents · yc · 2025-11-17 · 20 upvotes · similarity 0.43
- Castra · hn · 2026-04-01 · 8 upvotes · similarity 0.42
- ActingCommand · ph · 2026-09-18 · 1 upvotes · similarity 0.39
- Runtime · ph · 2026-05-20 · 304 upvotes · similarity 0.39
- Herdr · ph · 2026-09-07 · 1 upvotes · similarity 0.39
- Agent Interface · ph · 2026-09-18 · 79 upvotes · similarity 0.38
- Caddi · ph · 2026-08-28 · 311 upvotes · similarity 0.38
Other launches for this product
- No other launches for this product.
Same idea, different domain
Nobody's really built a model & infra tool for Fintech yet.