# Sublingual Landing Page Growth Score | YC W25 | Lazyweb

Lazyweb publishes a public search API over its indexed pages; the guide is at https://www.lazyweb.com/agent-access.

Source: https://www.lazyweb.com/yc-w25/sublingual
Source observed: 2026-10-20T07:15:28.516Z
Last checked: 2026-10-20T07:15:28.516+00:00
Indexed: 2026-10-20T10:02:40.676+00:00

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# Sublingual Landing Page Growth Score

We evaluate the landing page at [sublingual.ai](https://sublingual.ai/) as part of [YC W25](https://www.lazyweb.com/yc-w25). The report scores the page across CTA, value props, mobile web, information hierarchy, and trust, and compares it with five related sites.

## Overall result

Sublingual’s **Growth Score is 23/100**, updated **September 21, 2026**. The weakest category is **CTA**. We rank Sublingual sixth:

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 — 69](https://www.lazyweb.com/growth-score/site/phoenix.arize.com)
5. [LangSmith — 67](https://www.lazyweb.com/growth-score/site/langchain.com)
6. Sublingual — 23

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

### Category scores

- [CTA — 15](https://www.lazyweb.com/yc-w25/sublingual#gs-cta)
- [Value props — 15](https://www.lazyweb.com/yc-w25/sublingual#gs-value_props)
- [Mobile web — 22](https://www.lazyweb.com/yc-w25/sublingual#gs-mobile_web)
- [Information hierarchy — 32](https://www.lazyweb.com/yc-w25/sublingual#gs-information_hierarchy)
- [Trust — 32](https://www.lazyweb.com/yc-w25/sublingual#gs-trust)

## Score over time

The report includes a score-history visualization with series for Sublingual, LangSmith, Langfuse, Helicone, Arize Phoenix, and Braintrust. The supplied text does not provide the individual plotted historical values.

## CTA — 15/100, Poor

We assess whether copy, size, verb, and cost-feel make the primary CTA earn the click.

Problems identified:

- No CTA anywhere on the fold
- No link, button, or input exists
- The YC badge’s intent has no outlet

CTA comparison scores:

1. Langfuse — 86
2. Helicone — 85
3. LangSmith — 78
4. Braintrust — 78
5. Arize Phoenix — 72
6. Sublingual — 15

[Rewrite this CTA](https://www.lazyweb.com/backlog?site=sublingual.ai#opt-cta-writing) with our CTA rewrite studio to generate primary and secondary options grounded in Sublingual’s offer and visitor objections.

## Value props — 15/100, Poor

The page’s headline is described as vague. Its working elements are:

- A clean, memorable brand name
- The credibility supplied by “YC W25”

Areas identified for improvement:

- No statement of what the product does
- No outcome, audience, or numbers
- No hero image or demo

Value-proposition comparison scores:

1. Langfuse — 82
2. Braintrust — 73
3. Helicone — 72
4. Arize Phoenix — 62
5. LangSmith — 56
6. Sublingual — 15

## Mobile web — 22/100, Poor

We assess the phone experience as a first-class experience. The mobile capture identifies one issue:

![Mobile web annotations on the mobile capture](https://zlfyzdmohcskkucuunmk.supabase.co/storage/v1/object/public/sites/growth-score/site/sublingual.ai-mobile.jpg?v=2026-09-21T00%3A35%3A38.111%2B00%3A00)

1. **Sublingual headline:** The wordmark carries no value statement; “Y Combinator W25” is a credential rather than a reason to act.

[View mobile fixes](https://www.lazyweb.com/backlog?site=sublingual.ai#opt-mobile-web) to convert the findings into a prioritized implementation checklist.

## Information hierarchy — 32/100, Poor

![Information hierarchy annotations on the desktop capture](https://zlfyzdmohcskkucuunmk.supabase.co/storage/v1/object/public/sites/growth-score/site/sublingual.ai.jpg?v=2026-09-21T00%3A35%3A38.111%2B00%3A00)

The annotated findings are:

1. **Y Combinator subtitle:** The only supporting line is a credential, not a value proposition, so visitors learn nothing about the product.
2. **Sublingual wordmark:** The hero centerpiece has no CTA beneath it, leaving the scan path without an action.
3. **Copyright footer line:** The footer sits inside the first viewport, making the page appear finished before it communicates anything.

[View layout plan](https://www.lazyweb.com/backlog?site=sublingual.ai#opt-information-hierarchy) to turn these callouts into a sequenced page plan.

## Trust — 32/100, Poor

We assess proof that a product is real, competent, and safe to try. The comparison reads are:

| Site | Trust read |
| --- | --- |
| Sublingual | “Y Combinator W25” badge under the wordmark |
| LangSmith | “Interrupt is coming to London & NYC in the fall!” conference banner |
| Langfuse | “Used by 21 of Fortune 50 · 90B+ observations/month · 100,000+ engineers building on Langfuse” |
| Helicone | “1000+ AI teams use Helicone to build reliable products” with customer logos (together.ai, QA Wolf) |
| Arize Phoenix | GitHub star badge “Phoenix 11.5k ★” in the navigation |
| Braintrust | “TRUSTED BY THE BEST AI TEAMS” logo wall (Airtable, Notion, Stripe, Instacart, Dropbox, Ramp) |

Trust comparison scores:

1. Langfuse — 82
2. Helicone — 78
3. Braintrust — 72
4. Arize Phoenix — 64
5. LangSmith — 42
6. Sublingual — 32

[Build proof section](https://www.lazyweb.com/backlog?site=sublingual.ai#opt-trust-signals) to choose proof signals and get copy and placement for a trust section.

## Competitors

We infer these competitors from 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 — phoenix.arize.com — 69](https://www.lazyweb.com/growth-score/site/phoenix.arize.com)
5. [LangSmith — langchain.com — 67](https://www.lazyweb.com/growth-score/site/langchain.com)

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