# Lemma Landing Page Growth Score | YC F25 | Lazyweb

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Source: https://www.lazyweb.com/yc-f25/uselemma
Source observed: 2026-10-08T01:38:08.672Z
Last checked: 2026-10-20T07:25:44.895+00:00
Indexed: 2026-10-08T02:46:39.278+00:00

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# Lemma Landing Page Growth Score | YC F25

[← Back to YC F25](https://www.lazyweb.com/yc-f25)

[Lemma](https://www.uselemma.ai/) is evaluated in our Growth Score workspace. The page’s overall **Growth Score is 66/100**, updated **Sep 22, 2026**. Its weakest category is **Trust**, scored at **44**.

## Category scores

| Category | Score |
|---|---:|
| Trust | 44 |
| CTA | 66 |
| Value props | 72 |
| Mobile web | 72 |
| Information hierarchy | 74 |

## Ranking snapshot

1. [Langfuse — 77](https://www.lazyweb.com/growth-score/site/langfuse.com)
2. [Braintrust — 77](https://www.lazyweb.com/growth-score/site/braintrust.dev)
3. [Helicone — 75](https://www.lazyweb.com/growth-score/site/helicone.ai)
4. [Arize Phoenix / Arize AI — 74](https://www.lazyweb.com/growth-score/site/arize.com)
5. [LangSmith — 67](https://www.lazyweb.com/growth-score/site/langchain.com)
6. Lemma — 66

[Fix Trust](https://www.lazyweb.com/plans/checkout?plan=individual&source=growth_score_feature_build_fixes)

## Score over time

The report includes a score-over-time comparison for Lemma, Langfuse, LangSmith, Arize Phoenix / Arize AI, Braintrust, and Helicone.

## Trust — 44, Poor

Trust measures proof that the product is real, competent, and safe to try.

![Lemma trust capture](https://zlfyzdmohcskkucuunmk.supabase.co/storage/v1/object/public/sites/growth-score/site/uselemma.ai.jpg?v=2026-09-22T00%3A34%3A18.662%2B00%3A00)

The comparison table records these trust signals:

| Product | Trust read |
|---|---|
| Lemma | “BACKED BY Y Combinator” badge above the hero headline |
| Langfuse | Used 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 AI | Customer 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) |

The trust comparison ranks Langfuse 82, Helicone 78, Arize Phoenix / Arize AI 76, Braintrust 72, Lemma 44, and LangSmith 42.

[Build proof section](https://www.lazyweb.com/backlog?site=uselemma.ai#opt-trust-signals) is a PRO feature that helps choose proof signals and provides copy and placement for a trust section.

## CTA — 66, Fair

CTA measures whether copy, size, verb, and cost-feel earn the click.

The report identifies these problems:

- The demo gate feels costly and sales-first.
- There is no self-serve or product-entry path.
- A click delivers a form, not value.

The CTA comparison ranks Langfuse 86, Helicone 85, LangSmith 78, Braintrust 78, Arize Phoenix / Arize AI 72, and Lemma 66.

[Rewrite this CTA](https://www.lazyweb.com/backlog?site=uselemma.ai#opt-cta-writing) is a PRO feature for generating primary and secondary CTA options grounded in Lemma’s offer and visitor objections.

## Value props — 72, Fair

Value props evaluate whether the title, subtitle, and hero sell the product’s true value.

**Lemma’s headline:** “Stop guessing why your agents fail”

**Subheading:** “Production monitoring for AI agents. Surface silent failures, pull context across traces, improve your agent before users churn.”

### Working

- The pain-first hook names the felt problem.
- “Silent failures” and “churn” are concrete stakes.
- The YC badge adds credibility proof.

### Could improve

- No numbers or specifics appear above the fold.
- Hero art decorates rather than showing the product.
- On mobile, the outcome half of the subhead is dropped.

The value-proposition comparison ranks Langfuse 82, Braintrust 73, Lemma 72, Helicone 72, Arize Phoenix / Arize AI 68, and LangSmith 56.

## Mobile web — 72, Fair

Mobile web evaluates the phone experience as a first-class experience.

![Mobile web annotations on the mobile capture](https://zlfyzdmohcskkucuunmk.supabase.co/storage/v1/object/public/sites/growth-score/site/uselemma.ai-mobile.jpg?v=2026-09-22T00%3A34%3A18.662%2B00%3A00)

1. **BOOK A DEMO button:** It is pushed below the first viewport and is desktop-proportioned rather than 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.

[View mobile fixes](https://www.lazyweb.com/backlog?site=uselemma.ai#opt-mobile-web) is a PRO feature that converts the findings into a prioritized implementation checklist.

## Information hierarchy — 74, Fair

Information hierarchy evaluates whether the design helps or inhibits what the page is trying to say.

![Information hierarchy annotations on the desktop capture](https://zlfyzdmohcskkucuunmk.supabase.co/storage/v1/object/public/sites/growth-score/site/uselemma.ai.jpg?v=2026-09-22T00%3A34%3A18.662%2B00%3A00)

1. **Duplicate BOOK A DEMO:** The navigation-corner “BOOK A DEMO” repeats the hero CTA at similar visual weight, splitting one action across two targets.
2. **READ THE DOCS button:** The secondary CTA is nearly the same size and shape as “BOOK A DEMO,” diluting the single-action scan path.
3. **Five-link navigation row:** Docs, Blog, Weekly, Changelog, Careers, plus Login create six exits before the visitor reaches the demo CTA.

[View layout plan](https://www.lazyweb.com/backlog?site=uselemma.ai#opt-information-hierarchy) is a PRO feature that turns these callouts into a sequenced plan of what to keep, move, merge, or remove.

## Competitors

The report identifies competitors based on product, audience, and value proposition:

1. [Langfuse — langfuse.com — 77](https://www.lazyweb.com/growth-score/site/langfuse.com)
2. [Braintrust — braintrust.dev — 77](https://www.lazyweb.com/growth-score/site/braintrust.dev)
3. [Helicone — helicone.ai — 75](https://www.lazyweb.com/growth-score/site/helicone.ai)
4. [Arize Phoenix / Arize AI — arize.com — 74](https://www.lazyweb.com/growth-score/site/arize.com)
5. [LangSmith — langchain.com — 67](https://www.lazyweb.com/growth-score/site/langchain.com)
6. Lemma — 66

The report is available from the [YC F25 collection](https://www.lazyweb.com/yc-f25).

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