Drop it in
One script tag — or one React provider, if that’s your thing. The feedback button appears in your product. No backend, no webhooks, no config.
Works with Webflow, Framer, and plain HTML
Reality-check for product decisions
Stop building
on vibes.
Your users left receipts.
Lumen drops a feedback button into your product. Users send a screenshot, a voice note, a sentence — AI transcribes, classifies, and files every single one. Then, before you spend a week on a feature, you ask “should I build this?” and get an answer backed by your own feedback corpus. Not opinions.
No code required · 2-minute setup · 100 feedbacks free / month
“checkout dies on Safari”Bug“dark mode please”Feature“love the new editor btw”Praise“can’t find my invoices on mobile”Bug“the onboarding lost me at step 3”UX“would pay for a Zapier hook”Feature“why does saving take 8 seconds”Perf“this is exactly what I needed”Praise“notifications feel spammy”UX“import from Notion?”Feature“checkout dies on Safari”Bug“dark mode please”Feature“love the new editor btw”Praise“can’t find my invoices on mobile”Bug“the onboarding lost me at step 3”UX“would pay for a Zapier hook”Feature“why does saving take 8 seconds”Perf“this is exactly what I needed”Praise“notifications feel spammy”UX“import from Notion?”Feature
You see what you get
Watch the whole loop.
This is the product, playing live: a feedback button users actually use, an inbox that understands itself, and an agent that answers with receipts.
FernNew invoice
Recent invoices
Acme Studio€2,400.00PAID
Norra GmbH€880.00PAID
Atelier Kim€1,150.00DUE
Send feedback
Powered by LumenScreenshot
Record
Upload
No export?
REC 0:07
transcribing live · I can’t find the export button anywhere on mobile — I had to email my invoice to myself.
Send feedback
Feedback sent — thank you!
The entire loop runs in about 30 seconds of real time. No tickets written by hand.
The premise
Opinions are cheap. Evidence compounds.
Every feature you almost built, every redesign you debated at 2am — your users already weighed in. Lumen turns their screenshots and voice notes into a searchable corpus, so the next “should we?” takes thirty seconds instead of a leap of faith.
~30s
from user’s voice to filed, classified report
100%
of reports transcribed, embedded, and deduped
0
answers without a citation from your corpus
What “Lumen” means
A thousand scattered signals, pulled out of the dark and filed — in a blink.
Every voice note, screenshot, and stray sentence your users leave behind — transcribed, classified, deduped, and lit up as evidence. Faster than you finished reading this line.
How it works
Three moves. No ceremony.
Users talk
Screenshot with annotations, a 10-second voice note, or plain text. The SDK grabs URL, device, and console context automatically — users never fill out a form.
Voice to transcript in under a second
You ask
“Should I build this?” The Reality-Check agent searches everything your users ever said and answers with a verdict — and the receipts to back it.
Every answer cites its sources
Who it’s for
Built for people who’d rather ship than survey.
Solo founders
01One brain, ten hats. You can’t also be the QA team and the research department after midnight.
“let the corpus argue for you”
Vibe coders
02Cursor, Lovable, v0 — you generate features faster than you can validate them. Lumen tells you which ones earned their keep.
“ship now, reality-check at coffee”
No-code builders
03Webflow, Framer, Bubble. Paste one tag and you have the same feedback machinery as a funded product team.
“zero code, full signal”
Small product teams
04Five people, fifty ideas in flight. Stop settling roadmap debates with the loudest voice in the room.
“PMs read verdicts, not transcripts”
Install
No code? No problem.
One paste and your product collects evidence. Developers get first-class SDKs — but you don’t need one to start.
<script src="https://cdn.lumen.dev/sdk.js" data-key="lk_pub_XXXX"></script>Paste once before </body>. Works with Webflow, Framer, Squarespace, Shopify — anything that renders HTML.
Pricing
Cheaper than one wrong feature.
No per-seat traps, no surprise overages. The free tier is genuinely usable.
Free
€0forever
For solo builders kicking the tires.
- 1 project
- 100 feedbacks / month
- Voice transcription + AI filing
- Web SDK & no-code embed
- Community support
Pro
€29/ month
For founders who decide with receipts.
- Unlimited projects
- 10k feedbacks / month
- Unlimited Reality-Checks
- Video & upload capture
- EU data residency + PII redaction
- Priority support
Enterprise
Customlet’s talk
For organizations with serious requirements.
- SSO + SAML
- Self-host option
- SLA + uptime credits
- DPA on request
- Dedicated success engineer
Questions
Fair questions.
Before you commit to a feature, you ask the agent — “should I rebuild export?”, “do people care about dark mode?” — and it searches every piece of feedback your users ever sent, then answers with a verdict and the cited reports behind it. It only argues from your corpus, never from generic startup advice.
No. Paste one script tag into Webflow, Framer, Squarespace, Shopify or any HTML page and the feedback button appears. If you do write code, there’s a React provider (@lumen-stack/react on npm) and a React Native/Expo SDK in beta.
An annotated screenshot, a screen recording, an uploaded clip, a voice note, or plain text — straight from inside your product. URL, device, and console context attach automatically, so nobody fills out a form.
Within about 30 seconds it’s transcribed (if voice), embedded into your corpus, classified (bug / feature / UX with severity), and linked to similar reports. Nothing blocks the user — there are no AI calls on the capture path.
PII redaction is on by default for transcripts and screenshots. EU data residency is included on Pro, a DPA is available on request, and you (or your users) can delete any report at any time.
Surveys catch the 2% who answer; the Slack channel becomes an unread museum. Lumen captures feedback at the moment of friction and keeps it queryable — six months of context that answers questions instead of accumulating guilt.
Early access · letting builders in weekly
Your next feature is
already in the feedback.
Drop your email — we’ll ship you a project key, and your product starts collecting receipts the same afternoon.
Only early-access emails. Unsubscribe anytime.