Authorization for AI systems.
kastra.ai AI Models & Agents / Prompts, Evals & LLM Observability
- Monthly visits
- 10.6K
- Down37.8%MoMOct 2026
- Public revenue
- Undisclosed
- No public revenue evidence yet
- Entry price
- $19.99/mo
- Lower than 54% of peersNiche median $21.6/mo
- Launched
- 4mo ago
- 2026-07-09 · Est.
Traffic
Marketing moves
Launches, search & content, referrals, promotionsLaunched on Product HuntLaunch
Runtime authorization for Claude, Cursor, Codex and OpenClaw
Jul 22 · 4mo agoLaunch page
Launched on Show HN (1 pts)Launch
Build Rules for Claude Code, Cursor, and Codex — Hi HN, Fernando and I built Kastra. Kastra intercepts AI agent tool calls and evaluates them against deterministic policies before they ex…
Jul 13 · 4mo agoLaunch page
Launched on Show HN (13 pts · 5 comments)Launch
Policy enforcement for Claude Code, Cursor, and Codex — Show HN: Runtime authorization for Claude Code, Cursor, and Codex Hi HN, Fernando and I built Kastra. Kastra intercepts AI agent tool call…
Jul 9 · 4mo agoLaunch page
Third-party reviews & case dossiers
Acquisition breakdowns, engineer reviews & open-source metrics- Post excerpt:
- Show HN: Runtime authorization for Claude Code, Cursor, and Codex Hi HN, Fernando and I built Kastra. Kastra intercepts AI agent tool calls and evaluates them against deterministic policies before they execute. This is aimed at developers using coding agents like Claude Code, Codex, Cursor, and OpenClaw. We built Kastra after one of our Cursor agents almost
- Post excerpt:
- Hi HN, Fernando and I built Kastra. Kastra intercepts AI agent tool calls and evaluates them against deterministic policies before they execute. We built this product to control pre- and post-inference workloads. This is aimed at developers using coding agents like Claude Code, Codex, Cursor, and OpenClaw. Kastra pushes an allow, hold, and deny decision befo
MCP Server & Agent Ecosystem
Traffic sources
Traffic breakdown
No traffic channel or country breakdown data for this website yet.
Search
Domain authority —Domain registered Unknown
No search keyword data for this website yet.
Traffic data: Vaneform
Pricing
Trial: 15-day free trial, no card · 2 paid tiers ($19.99–$49.99) · Enterprise custom tier · Observed 2026-11-08 · Pricing page
Entry price $19.99/mo, Lower than 54% of peers; “Prompts, Evals & LLM Observability” median is $21.6/mo.View pricing benchmark
Pages & changes
Key pages
Weekly snapshotsChanges
No pricing, plan, or positioning changes detected since tracking started.
Design
Dark Developer (Dark canvas, airy density) featuring centered headline + cta layout and code block / terminal / cli visuals.
First-screen preview · click to zoom
First-screen pitch & conversion flow
“Authorization for AI systems.”
Centered Headline + CTA hero structure paired with start free / sign up CTA and no explicit trust bar.
Conversion path: Centered Headline + CTA + Code Block / Terminal / CLI → Start Free / Sign Up
- Category Positioning Anchor
- Code & Terminal
Palette · click to copy
- Typography
- 8.0
- Color & Contrast
- 8.0
- Layout & Spacing
- 8.0
- Craft & Polish
- 8.0
- Distinctiveness
- 7.0
Structure
- Fonts
- Syne / Plus Jakarta Sans / IBM Plex Mono
- Hero layout
- Centered Headline + CTA
- Primary visual
- Code Block / Terminal / CLI
- Conversion CTA
- Start Free / Sign Up
- Social proof
- No Explicit Trust Bar
- Navigation
- Full-Width Top Bar
- Theme & density
- Dark · Airy
- Corners & depth
- Medium Radius · Hairline borders
Preview full AI design brief (includes :root CSS variables & layout rules)Style tokens only; never copy brand names, logos, copy, or images
# Design Brief: Dark Developer (with Precision Swiss Grid)
Deep dark surfaces, monospace typography, terminal/code snippets, and high-precision borders.
## Design Tokens
```css
:root {
--background: #050706;
--surface: #121815;
--foreground: #fafafa;
--muted-foreground: #c3ccc7;
--accent: #44dfae;
--radius: 8px;
--font-heading: "Syne", ui-sans-serif, system-ui, sans-serif;
--font-body: "Plus Jakarta Sans", ui-sans-serif, system-ui, sans-serif;
--font-mono: "IBM Plex Mono", ui-monospace, monospace;
}
```
Color area ratio: Background #050706 (~71%) · Surface #121815 (~17%) · Text #FAFAFA (~6%) · Muted Text #C3CCC7 (~4%) · Accent #44DFAE (~2%). Background and surface dominate the canvas; reserve the accent color for primary buttons and active states.
## Layout & Conversion Structure
- Hero layout: Centered Headline + CTA
- Navigation: Full-Width Top Bar
- Theme & density: Dark · Airy
- Border radius & elevation: Medium Radius; no drop shadows—separate layers with hairline borders and whitespace
- Primary visual medium: Code Block / Terminal / CLI
- Conversion CTA: Start Free / Sign Up
- Headline hook: Category Positioning Anchor
- Hero components: Code & Terminal
- Spatial layout notes: Centered Headline + CTA hero structure paired with start free / sign up CTA and no explicit trust bar.
- Visual summary: Dark Developer (Dark canvas, airy density) featuring centered headline + cta layout and code block / terminal / cli visuals.
## Avoid
- Warm pastel backgrounds
- Playful cartoon illustrations
- Oversized pill buttons everywhere
Implement the UI following the design tokens and layout specifications above: use only these color variables, and reserve the accent color strictly for primary actions and active states. Adopt only this visual style—never copy any reference product’s brand name, logo, copy, or imagery.
Questions & evidence
- How much does Kastra cost?
- Pro: $19.99/mo; Team: $49.99/mo; Enterprise: Contact sales. Observed 2026-11-08. Check the source for current billing terms, usage limits and taxes.Source
- How much website traffic does Kastra get?
- Vaneform estimates 10.6K website visits in 2026-10. Visits can include repeat visits; this estimate measures web traffic separately from paying customers or revenue.Source
- What is Kastra and what platforms does it support?
- Kastra is catalogued under Prompts, Evals & LLM Observability: Authorization for AI systems.. Supported platforms: MCP Server, CLI / SDK, API.
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