Backed by Y Combinator

See what's really happening
in your product

AI that watches every session replay to catch bugs and surface insights automatically.

TRY FOR FREE

Trusted by world-class product teams

Finta

Happenstance

With AI, code velocity is no longer a bottleneck to building great products. The bottleneck becomes understanding users as they use your product and catching the bugs in features you're rapidly shipping.

Lucent helps exactly with this. I have been using Lucent actively and it has helped us identify everything from UX paper cuts to unexpected ways features were breaking.

Rahul Sonwalkar

Founder & CEO, Julius (YC S22)

Watching PostHog recordings manually is painful. Lucent just does it for me, and what surprised me most is how relevant the reports actually are. It detects real issues that are actual bugs or subpar UX

Raphael Fleckenstein

Founder & CEO, Productlane

Solid product, highly recommend!!

Saksham Aggarwal

Co-founder, Cardboard (YC W26)

We installed Lucent on a Friday, by Monday morning it had filed 7 bugs we'd never seen

Justin Lee

Co-founder, Den (YC X25)

Tried Lucent. Immediately flagged some good issues. Nice work on the product!

Raunak Chowdhuri

Co-founder & CTO, Reducto (YC W24)

If you care about great user experiences, you need to use Lucent to know bugs users are running into in realtime

Andy Wang

Founder & CEO, Finta (YC W23)

Lucent literally found critical signup UX issues in one day that we had not found in weeks of sentry errors / manually watching occasional recordings.

Gabe Madonna

Co-founder & CTO, Trainwell

With AI, code velocity is no longer a bottleneck to building great products. The bottleneck becomes understanding users as they use your product and catching the bugs in features you're rapidly shipping.

Lucent helps exactly with this. I have been using Lucent actively and it has helped us identify everything from UX paper cuts to unexpected ways features were breaking.

Rahul Sonwalkar

Founder & CEO, Julius (YC S22)

Watching PostHog recordings manually is painful. Lucent just does it for me, and what surprised me most is how relevant the reports actually are. It detects real issues that are actual bugs or subpar UX

Raphael Fleckenstein

Founder & CEO, Productlane

Solid product, highly recommend!!

Saksham Aggarwal

Co-founder, Cardboard (YC W26)

We installed Lucent on a Friday, by Monday morning it had filed 7 bugs we'd never seen

Justin Lee

Co-founder, Den (YC X25)

Tried Lucent. Immediately flagged some good issues. Nice work on the product!

Raunak Chowdhuri

Co-founder & CTO, Reducto (YC W24)

If you care about great user experiences, you need to use Lucent to know bugs users are running into in realtime

Andy Wang

Founder & CEO, Finta (YC W23)

Lucent literally found critical signup UX issues in one day that we had not found in weeks of sentry errors / manually watching occasional recordings.

Gabe Madonna

Co-founder & CTO, Trainwell

As a digital pharmacy serving chronic patients, UX isn’t a nice-to-have. Lucent has surfaced bugs and friction points we never would have caught otherwise. It paid for itself almost immediately. Our patients deserve a flawless experience, and Lucent helps us deliver it.

Alejandro Zárate

Co-founder & CEO, Vitau (YC S19)

Lucent catches when things silently break in production. Paid for itself in the first week :)

Jianna Liu

Co-founder, Cardinal (YC W26)

Loving the product so far, we've already caught 3 prod bugs thanks to it. Definitely feels like the future of automated testing and dogfooding.

Have been looking for an AI session replay product that actually works for so long, had tried 3 other YC products and none of them actually worked 😅

Ishan Shah

Founding Engineer, Happenstance (YC W24)

Got fed up with many UI bugs occurring across different device types and screen sizes. We used Lucent to figure out what was breaking, and it saved us a lot of time. Checking the most important parts of user logs is a really smart and useful concept.

Joseph Zhang

Co-founder & CEO, CatchBack Cards (YC W26)

Lucent helps us catch and fix bugs that would have otherwise taken hours of manually going through session recordings. All in a simple plug and play platform. Highly recommend for product & engineering teams.

Paulo Nascimento

Co-founder, The Hog (YC F25)

Lucent has caught issues watching Posthog recordings that I never would have, bugs big and small.

Sander Schulhoff

Founder & CEO, InventoryQuant (YC W26)

As a digital pharmacy serving chronic patients, UX isn’t a nice-to-have. Lucent has surfaced bugs and friction points we never would have caught otherwise. It paid for itself almost immediately. Our patients deserve a flawless experience, and Lucent helps us deliver it.

Alejandro Zárate

Co-founder & CEO, Vitau (YC S19)

Lucent catches when things silently break in production. Paid for itself in the first week :)

Jianna Liu

Co-founder, Cardinal (YC W26)

Loving the product so far, we've already caught 3 prod bugs thanks to it. Definitely feels like the future of automated testing and dogfooding.

Have been looking for an AI session replay product that actually works for so long, had tried 3 other YC products and none of them actually worked 😅

Ishan Shah

Founding Engineer, Happenstance (YC W24)

Got fed up with many UI bugs occurring across different device types and screen sizes. We used Lucent to figure out what was breaking, and it saved us a lot of time. Checking the most important parts of user logs is a really smart and useful concept.

Joseph Zhang

Co-founder & CEO, CatchBack Cards (YC W26)

Lucent helps us catch and fix bugs that would have otherwise taken hours of manually going through session recordings. All in a simple plug and play platform. Highly recommend for product & engineering teams.

Paulo Nascimento

Co-founder, The Hog (YC F25)

Lucent has caught issues watching Posthog recordings that I never would have, bugs big and small.

Sander Schulhoff

Founder & CEO, InventoryQuant (YC W26)

Capabilities

Bug detection + product intelligence, fully automated

01Insights

See patterns across all your sessions

Receive weekly reports on:

Which parts of your app are working well
Which parts are problematic
Actionable priorities for your team

Apr 8 - Apr 15, 2026

Your product shows strong engagement with AI feedback features but sees friction in auth and onboarding.

Working well

1.High engagement with iterative feedback

Users are heavily utilizing the Get Feedback flow to refine their work between evaluations (#8, #9).

+7more

Friction

2.Authentication and onboarding blocks

Users encounter login failures and onboarding drop-off, from verification issues to abandoned role setup (#2, #3).

+5more

02Detection

Detect bugs and UX problems

Get alerts the moment your users hit issues - before they churn.

Infinite page refresh loop upon deleting file
User could not upgrade to premium due to validation error
Form loses all data when the user hits "back"
Users rage-clicking a disabled "Save" button

High

Form submission fails silently

Invoice page · 12 users affected

Medium

Dropdown closes unexpectedly

Settings · 5 users affected

03Debugging

Detailed bug reports, automatically

Every issue comes with full context:

Steps to reproduce
Session replay link
Console logs, network requests, and events
Severity and affected users

Your engineers get everything they need to fix bugs fast.

bugs

LucentAPP3:42 PM

🐛New bug detected in #checkout

Lucent · BUG-1247 · 3 min ago

Confirm button became unresponsive after entering card details on /checkout. Repro in 4 steps; full session replay attached.

Severity

High

Affected

8 users

Browser

Safari iOS 17

04Signals

Monitor any user behavior

Describe a Signal you're looking for, Lucent extracts it from past and future sessions.

User showing upgrade intent
User that came to try feature Y
User who invited teammates
User searching for a feature we don't have yet

Signal

Monitoring

"Users who clicked Upgrade to Pro but didn't complete checkout"

Scanned 4,247 sessions

27 matchesin the past 30 days

+23more

05Impact

Know exactly who was affected

For every bug, see a list of every user who hit it. Understand the real blast radius of issues and, when you ship the fix, notify affected users to show them you care.

Form submission fails silently

Invoice pageDetected 2h ago

Affected users

01SC
Sarah Chensarah@acme.co
14m
02JW
James Wilsonjames@startup.io
28m
03MG
Maria Garciamaria@bigcorp.com
45m
04
+9 more

06Integrations & MCP

Works where you work

Bug reports go straight to Slack, Gmail, or Linear. Query your issues, signals, and insights directly from Claude Code, Cursor, ChatGPT, Windsurf and more via MCP.

Integrations