Karumi – AI Product Demos That Personalize at Scale

TL;DR

TL;DR: Karumi is a YC F25 startup that uses AI agents to give every website visitor a personalized, guided product demo — fully automated, zero sales rep needed, works in any language.

Source and Accuracy Notes

• Official site: karumi.ai
• HN Launch post: Launch HN: Karumi (YC F25) — 40 points
• Built by Toni and Pablo (founders’ description on HN)

What Is Karumi?

Landing pages convert poorly when visitors can’t immediately see themselves using the product. Product tour videos are generic. Live demo calls don’t scale. Karumi bridges this gap with an AI-powered demo system that personalizes the experience to each visitor’s context.

The core idea: instead of showing a fixed demo recording, Karumi’s agent walks the visitor through the product using scenarios relevant to their use case. It feels like a guided tour customized for that specific person — without a human on the other end.

Key capabilities:

• No-code setup — point Karumi at your product, define key workflows
• Multi-language — demos work in any language out of the box
• Zero human involvement — visitors trigger a session, the AI takes over
• Scalable — same demo runs for 1 or 10,000 visitors simultaneously

Setup Workflow

Setting up Karumi on your SaaS product follows a standard integration pattern.

Step 1: Connect Your Product

Karumi supports integration via a JavaScript snippet or a dedicated SDK for single-page applications. You add a few lines to your app, point Karumi at the pages you want to demo, and define the entry points.

# Installation via npm (for SPAs)
npm install @karumi/sdk

The snippet approach works for traditional server-rendered apps — you paste a script tag and configure which routes should activate the demo mode.

Step 2: Define Demo Flows

You create demo scenarios in Karumi’s dashboard. A scenario is a sequence of steps the agent walks through — clicking buttons, filling forms, demonstrating a specific workflow. You can have multiple scenarios targeting different personas.

For example, an analytics SaaS might have:

• “Explore your first dashboard” (for new signups)
• “Set up a custom report” (for power users exploring advanced features)
• “Invite your team” (for users evaluating collaboration features)

Step 3: Deploy and Trigger

Once your flows are defined, Karumi embeds a widget on your site. Visitors can click to start a demo, or you can trigger it based on behavior (e.g., after 30 seconds on the pricing page).

// Trigger demo programmatically
Karumi.start({
  scenario: 'pricing-explainer',
  visitor: {
    company: 'Acme Corp',
    plan: 'starter'
  }
});

Deeper Analysis

Why This Matters for SaaS

The average B2B SaaS landing page has a 2-5% conversion rate. The biggest drop-off happens before visitors even reach a demo — they bounce because they can’t quickly see value. Karumi addresses this by making the product tangible without requiring a calendar booking.

The AI agent approach also solves the problem of demo quality variance. With human-led demos, you get inconsistency — a great demo on Monday, a rushed one on Friday. Karumi’s flows run the same way every time.

Where It Falls Short

Karumi works best for products with clear, navigable workflows. If your product is highly complex, requires deep context, or has too many edge cases for a linear demo, you may find the flows feel shallow. It also doesn’t replace the value of a live technical conversation for enterprise deals.

The tool is still early (YC F25 batch). The dashboard and flow builder are functional but not yet polished compared to established players in the demo automation space.

Pricing Model

From the HN launch thread, Karumi’s pricing is usage-based based on demo sessions run. The free tier allows a limited number of sessions per month — useful for evaluating the product. Paid plans scale with volume and include more scenarios and customization options.

Exact pricing isn’t publicly listed — you’d need to talk to their team for an enterprise quote.

Practical Evaluation Checklist

• [ ] Does your product have clear, linear workflows that demonstrate core value?
• [ ] Are you losing visitors who want to “see it in action” before talking to sales?
• [ ] Do you have the bandwidth to define 3-5 strong demo scenarios initially?
• [ ] Is your average deal size high enough to justify a demo automation tool?
• [ ] Do you serve international users who would benefit from multi-language demos?

If you answered yes to 3+, Karumi is worth a trial.

Security Notes

Karumi runs as a client-side integration. The SDK loads in the browser and communicates with Karumi’s servers to coordinate demo sessions. Key considerations:

• No sensitive data leaves your infrastructure — the SDK sends visitor context (company name, plan tier, etc.) which you control
• Session recordings — Karumi may record demo sessions for quality/review purposes; check your data retention policy
• Bot detection — ensure demo sessions are attributed correctly in your analytics (they’re automated, not human-led)

Review Karumi’s data processing agreement before enabling on a production site, especially if you operate in regulated industries.

FAQ

Q: Does Karumi work for mobile apps or only web products?

A: Currently focused on web-based SaaS products. Mobile app support is on the roadmap but not available at launch.

Q: Can I customize the demo flow based on UTM parameters or referral source?

A: Yes. The SDK accepts visitor context including UTM parameters, referral source, and custom attributes. You can route visitors to different scenarios based on how they arrived.

Q: How does Karumi handle products with authentication walls?

A: You configure a demo mode that runs inside a read-only sandbox or uses pre-populated test accounts. The agent operates within that constrained environment.

Q: What’s the typical setup time?

A: According to founders on HN, most teams can have a working demo flow within a day. More complex products with multiple scenarios may take 2-3 days to configure properly.

Q: Does this replace live sales demos for enterprise deals?

A: No. Karumi is positioned as a top-of-funnel conversion tool, not a replacement for deep technical demos. Enterprise deals typically still need human-led discovery and custom demonstrations. Karumi handles the “get them excited” phase.

Conclusion

Karumi is an interesting early-stage tool in the AI demo automation space. It directly targets the conversion gap on SaaS landing pages — the segment of visitors who want to see the product working but won’t book a call. The multi-language support and fully automated nature make it particularly useful for products with international audiences.

The tool is still maturing, and the flow builder doesn’t have the polish of more established products. But for early-stage SaaS teams looking to squeeze more conversions out of organic traffic, it fills a real gap. Worth evaluating against tools like Reprise and Arcade if you’re in the market for demo automation.

Next steps:

• Visit karumi.ai and request early access
• Define your top 3 visitor personas and map them to demo scenarios
• Set up your first flow and A/B test it against your existing landing page