Zap your site with 100+ AI personas. They click, hesitate, bounce — we tell you where they got lost. No recruiting. No waiting for traffic.
Streamed live, reproducible with a seed. You pay only for completed steps.
"Buy a razor under $30." "Sign up for the trial." Or no goal — let them wander.
Pick from our default matrix, or upload your real audience as markdown. We screen out the noise.
Heatmaps, drop-off paths, persona failures, and an exec summary your team will read.
The same insights you'd get from a five-week usability study, on the same day you push the deploy.
Four overlapping channels — click, confusion, attraction, repulsion. Each dot carries the agent's exact reasoning.
Eight dimensions of realism — confidence, device, accessibility, intent. Mix our defaults, or bring your own audience.
Top drop-offs, persona-specific failures, prioritized fixes — written in plain English, not just charted.
Drop in a markdown file describing your target users. We screen for nonsense and injection attempts before any agent reads them.
Every agent step streams to your dashboard as it happens. No five-minute black-box waits.
Click any heatmap dot. See what the agent saw, and what they thought about it.
A nurse on her second 12-hour shift browses differently from a regulatory buyer with a spec sheet. We model eight dimensions of that difference — and you can write your own.
“I need to see shipping date before I scroll. If it's not visible by the second tap, I'm gone.”
“I'll open every product link in a new tab and compare before I commit. Reviews matter more than price.”
“Unlabelled buttons make me back out. If your alt text is empty, your conversion is empty.”
“I know where everything is. Don't redesign your nav without telling me — I'll fail upward.”
“I'm not buying today. But your interstitial newsletter popup just guaranteed I never come back.”
“I need PDF spec sheets and compliance docs before I add to cart. Marketing copy is noise.”
Most heatmap tools guess where users looked. We read what they thought. Every dot is sourced from an agent's reasoning trace — hover it to see the exact line that put it there.
Calibrated persona packs, hand-built by the Zaplens team. Install once, drop into any simulation — skip the cold-start work of writing ten plausible synthetic users from scratch.
Each pack is a weighted ensemble of ten personas calibrated for one user type — a skeptical parent, an impatient engineer, a privacy-conscious EU shopper. Ready to run, not a starter template.
Every pack passes the two-stage validator we run on custom personas. No prompt-injection sneaking in through the back door.
A pack bump never rugs your historical runs. Your old sim stays on v3; you move to v4 when you're ready.
The catalog is seeded by the Zaplens team today, but the publish path is live — bring your own crowd and ship it to the catalog when you're ready.
Run two simulations with different changes. Same persona crowd, same goal. We diff who flipped, what improved, and write the verdict line your stakeholders need — before a single real user sees the redesign.
We pin the persona seed across both runs. The same sleep-deprived NICU nurse browses v1 and v2 — apples-to-apples, not a fresh random crowd each time.
Headline first: “v2 beats v1 by +12pp on completion rate.” Then the persona buckets that flipped and the pages that improved or got worse.
Side-by-side heatmaps with a ⊕ diff overlay — lime where the redesign helped, rose where it didn't. Plus a line-level HTML diff for the receipts.
Every run you launch gets tagged. Drop two of them into a battle and we crunch the diff in seconds. No new setup, no new pricing.
“Current production checkout — control.”
“Replaced "Add to cart" with "Get yours today".”
Plug Zaplens into your AI assistant with one command. It launches sims, streams progress live, and summarises the report — without leaving the conversation.
$ claude mcp add-json zaplens '{"type":"http","url":"https://api.zaplens.site/mcp/","headers":{"Authorization":"Bearer agl_live_…"}}'
No pipx, no configure step. Mint a Pro key in Settings → API keys and we'll pre-fill the snippet for you. Your assistant gets eight new tools — launch, wait, summarise, compare, and friends.
14/20 agents complete. No silent ten-minute waits.Run a 20-agent sim on staging.acme.com/checkout. Focus on mobile, and tell me what to fix before Thursday.
On it — launching the run.
14 of 20 mobile users dropped at the persona-selector modal. The three things blocking shipping Thursday:
Want me to open a Linear issue with these and the screenshots?
Pay for what you ship, not what you might use. Annual saves 20%.
100 free credits on Hobby — enough for a full demo. No card up front.