Share your website or iPhone app. In about 20 minutes, we’ll email you a user test report with clear findings and prioritized recommendations.
Members can view existing and future reports and start tests using the workspace’s shared credits.
Your link and instructions are saved. Sign in so we know where to email your report.
This uses one test from your available allowance.
We’ll begin reviewing your website shortly.
How it works
Watch simulated users find what you missed. Modeled on real customer personas, they explore the product, complete tasks, answer questions, and turn the experience into specific, prioritized feedback.
Add your website, choose desktop or mobile, and select or describe a persona that reflects the customers you want to understand.
Give each user a goal, like completing site onboarding or selecting a subscription plan, and ask questions about clarity, trust, appeal, or anything else that matters.
Task 1Starting on the homepage, and without signing up, work out what this product does and who it’s for.
Task 2Sign up and try the main feature. Stop wherever you would normally give up.
Task 1Find where to change your email notifications and turn off the weekly summary.
Task 2Visit the dashboard, pricing, and help pages, then return to where you started.
Task 1Halfway through the signup form, press Back, then Forward, and finish signing up.
Task 2Submit the contact form twice in quick succession, then again with a 300-character name.
Task 1Create an account and complete every item on the setup checklist.
Task 2Upgrade to the Pro plan with test card 4242 4242 4242 4242.
Task 1On a phone-sized screen, open the menu and find the pricing for teams.
Task 2Fill in the booking form and submit it with the on-screen keyboard open.
See whether the goal was completed, watch the recorded session, and get clear, reproducible findings with supporting evidence and recommendations.
After the first click, the Pay button stayed active with no confirmation that the order was processing. Clicking it again created two orders and charged the card twice.
Recording at 01:48 · 2 screenshots
Apply the feedback and test again in minutes, without waiting for real users to give the right feedback or run into issues on their own.
Since run 1
What builders said after Constants explored their products, surfaced the rough edges, and gave them something concrete to improve.
“This is incredibly valuable feedback. An outside perspective can really see things differently and more realistically.”
“This is pure gold. Amazing feedback. I’ll fix it.”
“Dang dude! This is quality feedback!”
“I have implemented these changes. I really appreciate it.”
“Your setup for this is pretty cool! Thanks for giving it a run.”
“You gave me a few new angles to look at. I’ll fix all of those in the next couple of days.”
“Thanks, I appreciate it!”
“They’re mostly API issues. We will work on it. I’m so grateful.”
“Thank you. That’s a lot of great feedback.”
“Amazed by how detailed the report is and how it covered most of the issues I have, including those that needed fixing.”
“These are all nice finds, and I’ll fix them today. I appreciate all your efforts.”
“Thank you. I will fix these now :-)”
“Incredibly appreciate the feedback. Thank you.”
“That is a genuine mistake and inconsistency I did not notice. I will fix it.”
“Thanks, will update!”
“Thanks a bunch!”
“Appreciate the signup attempts! I’ll take a look and see what the bug could be.”
“This is exactly the kind of feedback I was looking for. You caught several things I completely missed.”
“That’s some really honest and useful feedback. I’m impressed.”
“Thank you for such detailed and actionable feedback! I honestly didn’t consider accessibility at all, so this is great.”
Pricing
Every workspace gets its first successful test free. No credit card required.
First test
Free
1 complete test
Report and session recording included
Starter
$29/ month
30 tests every month
Choose Starter →Scale
$99/ month
100 tests every month
Choose Scale →Team
Before Constants, we were product and engineering leads at Waymo. There, simulation modeled real human driving behavior at enormous scale, helping Waymo improve safety beyond human benchmarks and drive hundreds of millions of fully autonomous miles. We built the models and developer tools that made those simulations useful, repeatable, and accessible across the company.
Give entrepreneurs, developers, and product teams the same leverage: simulation of real user behavior that surfaces problems sooner and helps them build better products faster.
