The Sims for
your product.
Run AI-powered user personas through your app before a single real user sees it. They hesitate, misread, backtrack, and give up — exactly like real people. You get a plain-English report, not a test log.
Product teams are shipping blind.
You test if the app works. Nobody tests if real users understand it.
User research is too slow and expensive.
A proper usability study takes 3–6 weeks and costs lakhs. Most PMs skip it entirely and ship on gut feel.
QA tools test if the app works — not if users understand it.
Playwright and Cypress confirm buttons work. They can't tell you if a 52-year-old doctor would trust the UI or find the booking flow.
Analytics shows where users drop off — never why.
Funnels tell you 40% abandoned at step 3. They never tell you if users were confused, distrustful, or just lost.
Onboarding documentation goes stale immediately.
UI elements get renamed, steps get reordered. New users follow the PDF and get lost — and nobody finds out.
Two-sided platforms can't test both sides together.
A doctor listing availability and a patient booking it involves a handoff that single-user testing can never surface.
Meet your Sims.
Build an AI persona, give it a mission, watch it navigate your product autonomously — narrating every decision in plain English.
Build a Sim
Choose a role, set demographics, adjust six behavioral sliders. Presets like "Busy Senior Doctor" auto-fill a complete profile.
Set a mission
A target URL, a plain-English goal, and optionally an onboarding document the Sim is constrained to use.
Watch it run
The Sim navigates live. Its reasoning streams beside it — confusion, hesitation, and all — in real time.
Get a Sim Report
A shareable, plain-English summary of what broke and why. Forward it without explanation.
Everything you need to test like a real user.
From persona building to doc gap detection — the full stack for behavioural UX testing.
Documentation gap testing
Load your onboarding PDF and constrain the Sim to use only that document's knowledge. It surfaces every mismatch between what your docs promise and what your product actually does.
- Renamed buttons your docs haven't caught up to
- Moved elements and missing prerequisite steps
- Stale screenshots and removed features
- Every gap, flagged automatically — no full Sim run required
Sim DNA builder
Role selector, demographic inputs, and six behavioral sliders: Tech Comfort, Reading Patience, Goal Urgency, Trust in UI, Risk Tolerance, and Irrationality Factor.
Live Sim run
Split screen: the Sim navigating on the left, real-time reasoning on the right. Cursor trails, click-pulse animations, confusion zones highlighted as they happen.
Sim report
A shareable, plain-English output built for PMs. Mission result, success rate, confusion points, click heatmap, and recommended fixes.
Persona comparison
Run the same mission across multiple Sim types at once. See how a Doctor Sim, a Patient Sim, and a First-timer each succeed or fail on the same flow.
UX confusion score
A single trackable metric per session. "Doctor Sim score went from 62 to 78 after the navigation redesign." Watch it move across releases.
Click heatmap
Click coordinates logged per session, rendered as a heatmap overlay on a page screenshot. See exactly where each persona got stuck.
Stale content detector
A fast scan that cross-references every UI reference in your docs against the live product — no full Sim run required.
Sim Imprint
A 15-minute session where a real user trains a Sim on their actual behavior — producing an empirical behavioral fingerprint, not an estimated baseline.
Who Simulr is for.
Product managers
Find real UX problems in hours, not weeks. No recruiting, no waiting on analytics. Forward a Sim Report into your next sprint planning without explanation.
Customer success & sales
Audit onboarding PDFs before the next enterprise client goes live. Catch every doc gap before your CSM discovers it on a call.
Two-sided & marketplace platforms
Test both sides of a marketplace together — a seller and a buyer, a host and a guest, a provider and a customer. Surface handoff failures no single-user test ever catches.
"Book a cardiologist under ₹500 in Mumbai using only the onboarding PDF."
"Set up your first automated ticket routing rule using the onboarding guide."
"Book a home cleaning service for this Saturday before noon."
"Find a moisturiser under ₹400 with SPF and add it to cart."