LemmaYC F25 landing page report.
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Lemmahttps://www.uselemma.ai/

Your landing page’s weakest score is Trust.

How Lemma ranks

  1. 1.Langfuse77
  2. 2.Braintrust77
  3. 3.Helicone75
  4. 4.Arize Phoenix / Arize AI74
  5. 5.LangSmith67
  6. 6.Lemma66
Fix Trust
66Growth scoreupdated

category scores

Trust44CTA66Value props72Mobile web72Information hierarchy74
category scoresShowHide
Trust44CTA66Value props72Mobile web72Information hierarchy74

Score over time

9080706050Langfuse 77 on Sep 3 (Live)LangSmith 64 on May 27 (Wayback)LangSmith 67 on Jun 11 (Wayback)LangSmith 68 on Jun 24 (Wayback)LangSmith 65 on Jul 10 (Wayback)LangSmith 66 on Jul 23 (Wayback)LangSmith 67 on Jul 28 (Live)LangSmith 70 on Aug 9 (Wayback)Arize Phoenix / Arize AI 62 on Jul 2 (Wayback)Arize Phoenix / Arize AI 58 on Jul 22 (Wayback)Arize Phoenix / Arize AI 69 on Aug 9 (Wayback)Arize Phoenix / Arize AI 60 on Aug 28 (Wayback)Arize Phoenix / Arize AI 74 on Sep 20 (Live)Braintrust 79 on Mar 24 (Wayback)Braintrust 77 on May 4 (Wayback)Braintrust 78 on Jun 13 (Wayback)Braintrust 77 on Jul 28 (Live)Helicone 74 on Jun 15 (Wayback)Helicone 77 on Jun 24 (Wayback)Helicone 76 on Jul 2 (Wayback)Helicone 76 on Jul 20 (Wayback)Helicone 75 on Jul 28 (Wayback)Helicone 76 on Aug 27 (Wayback)Helicone 75 on Sep 20 (Live)Lemma 66 on Sep 22 (Live)Sep 22

Trust

44Poor

Proof that the product is real, competent, and safe to try.

Lemma
Langfuse
Helicone
Arize Phoenix / Arize AI
Braintrust
Trust read
Lemma"BACKED BY Y Combinator" badge above the hero headline
LangfuseUsed by 21 of Fortune 50 · 90B+ observations/month · 100,000+ engineers building on Langfuse
LangSmith'Interrupt is coming to London & NYC in the fall!' conference banner
Arize Phoenix / Arize AICustomer logo wall under "Powering the world's leading AI teams" (Uber, Spotify, Instacart, DoorDash, Booking.com)
Braintrust"TRUSTED BY THE BEST AI TEAMS" logo wall (Airtable, Notion, Stripe, Instacart, Dropbox, Ramp)
Helicone"1000+ AI teams use Helicone to build reliable products" with customer logos (together.ai, QA Wolf)

CTA

66Fair

Copy, size, verb, cost-feel — does the primary CTA earn the click?

Lemma
Langfuse
Helicone
LangSmith
Braintrust
Arize Phoenix / Arize AI

Problems

  • demo gate feels costly, sales-first
  • no self-serve or product entry path
  • click delivers a form, not value

Value props

72Fair

Title, subtitle, hero — do they sell the product's true value?

Lemma’s headline sellsStop guessing why your agents failProduction monitoring for AI agents. Surface silent failures, pull context across traces, improve your agent before users churn.

Working

  • Pain-first hook names the felt problem
  • "Silent failures" and "churn" are concrete stakes
  • YC badge adds credibility proof

Could improve

  • No numbers or specifics anywhere in fold
  • Hero art decorates, never shows the product
  • Mobile drops the outcome half of subhead

Mobile web

72Fair

The phone experience as a first-class citizen.

Mobile web annotations on the mobile capture12
  1. BOOK A DEMO button — Pushed below the first viewport and desktop-proportioned instead of full-width and thumb-friendly.
  2. Decorative wireframe cards — Three ornamental frames stack above the headline, pushing the value statement and CTA down the page.

Information hierarchy

74Fair

Does the design help or inhibit what the page is trying to say?

Information hierarchy annotations on the desktop capture123
  1. Duplicate BOOK A DEMO — Nav-corner 'BOOK A DEMO' repeats the hero CTA at similar visual weight, splitting the one action across two targets.
  2. READ THE DOCS button — Secondary CTA sits at nearly the same size and shape as 'BOOK A DEMO', diluting the single-action scan path.
  3. Five-link nav row — Docs, Blog, Weekly, Changelog, Careers plus Login give six exits before the visitor reaches the demo CTA.

Competitors

inferred from product, audience, and value prop
#1Langfuselangfuse.com77 #2Braintrustbraintrust.dev77 #3Heliconehelicone.ai75 #4Arize Phoenix / Arize AIarize.com74 #5LangSmithlangchain.com67
#6Lemma66