UserProof

UserProof / YC homepage check / LightSprint

LightSprint homepage check

Checked October 28, 2026 · Spring 2026 · lightsprint.ai

95out of 100 · Good · #92 of 378

LightSprint (Software factory for product teams) scored 95 out of 100 on our homepage check, #92 of 378 YC startups and #15 of 54 in Spring 2026. It passed 9 of 10 checks. The biggest problem: "Book demo" is 36px tall on mobile (under 44px is easy to miss).

LightSprint home page on a phone
LightSprint on a 390px phone, October 28, 2026. Outlined: “Book demo”, the button we tested.
  • Pass
    A sign-up, demo or get-started button on the first phone screen“Book demo” is on the first screen.67% of YC startups pass this.
  • Pass
    The main button does something when tapped“Start for free” opens https://app.lightsprint.ai/login.99% of YC startups pass this.
  • Pass
    Nothing covers the main buttonNothing sits on top of it.96% of YC startups pass this.
  • Fail
    The main button is at least 44px tall on a phone (−5 points)"Book demo" is 36px tall on mobile (under 44px is easy to miss).65% of YC startups pass this.
  • Pass
    The page fits a phone screenNo sideways scrolling on a 390px-wide phone.100% of YC startups pass this.
  • Pass
    No JavaScript errors from the site's own codeNone seen while loading and tapping the main button.95% of YC startups pass this.
  • Pass
    No broken links to the site's own pages9 internal links checked.97% of YC startups pass this.
  • Pass
    Everything that looks clickable respondsClickable things on 3 pages responded.90% of YC startups pass this.
  • Pass
    Loads in under 4 seconds on desktop and 6 on a phoneLoaded in 3.8s on desktop and 4.6s on a phone.75% of YC startups pass this.
  • Pass
    Images and files loadEverything we requested from the site loaded.92% of YC startups pass this.

How LightSprint compares

LightSprint is the outlined dot. The top row is all 378 YC startups we checked; the bottom row is Spring 2026.

Score
All startups378 sites
LightSprint: 95/100
LightSprint: 95/100
Spring 202654 sites
Arga Labs: 100/100Atrisa: 100/100Autostep: 100/100Deep Interactions: 100/100Drafted: 100/100Dreach: 100/100Lab0: 100/100Memoir: 100/100ReasonBlocks: 100/100Silmaril: 100/100Soria: 100/100Stage: 100/100Userlens: 100/100Wato: 100/100Allowance: 95/100Arden: 95/100Auxos: 95/100BentoLabs AI: 95/100Cohesion: 95/100Fuchsia: 95/100Imperfect: 95/100InsForge (InstaCloud): 95/100KelAI: 95/100Korso: 95/100Limrun: 95/100Maquoketa Research: 95/100OpenWork: 95/100Paper Star: 95/100Result: 95/100Runtime: 95/100Wealor: 95/100Hessian: 90/100Kuli: 90/100Minicor: 90/100Mochatrade: 90/100Parrot: 90/100Replicas: 90/100Sazabi: 90/100Amboras: 85/100AGI Deploy Co: 80/100ANORIA: 80/100Aster: 80/100Interfaze: 80/100Lamina Labs: 80/100Ontora: 80/100Thomas: 80/100Twolabs: 80/100Antinuous: 75/100Complir: 75/100Dayjob: 75/100Manicule: 75/100RentAHuman: 75/100transload: 75/100LightSprint: 95/100
Arga Labs: 100/100Atrisa: 100/100Autostep: 100/100Deep Interactions: 100/100Drafted: 100/100Dreach: 100/100Lab0: 100/100Memoir: 100/100ReasonBlocks: 100/100Silmaril: 100/100Soria: 100/100Stage: 100/100Userlens: 100/100Wato: 100/100Allowance: 95/100Arden: 95/100Auxos: 95/100BentoLabs AI: 95/100Cohesion: 95/100Fuchsia: 95/100Imperfect: 95/100InsForge (InstaCloud): 95/100KelAI: 95/100Korso: 95/100Limrun: 95/100Maquoketa Research: 95/100OpenWork: 95/100Paper Star: 95/100Result: 95/100Runtime: 95/100Wealor: 95/100Hessian: 90/100Kuli: 90/100Minicor: 90/100Mochatrade: 90/100Parrot: 90/100Replicas: 90/100Sazabi: 90/100Amboras: 85/100AGI Deploy Co: 80/100ANORIA: 80/100Aster: 80/100Interfaze: 80/100Lamina Labs: 80/100Ontora: 80/100Thomas: 80/100Twolabs: 80/100Antinuous: 75/100Complir: 75/100Dayjob: 75/100Manicule: 75/100RentAHuman: 75/100transload: 75/100LightSprint: 95/100

Good (90+)Fair (75-89)Needs work (0-74)Each dot is one startup. Tap a dot to see its page.

Is this your startup?

A scan shows what a first visit looks like. Your real visitors show the rest: where they tap, what they skip, where they leave. UserProof records them and gives Claude Code the one fix that costs you the most signups, with the file and line. Free for 3 sites.

Set up UserProof free

Get the next report

We run this check every month on new YC companies. One email when the next report is out, nothing else.

Other Spring 2026 startups with similar scores

← #92 LegalOS · #92 Limrun → · All 378 scores

How we checked

We loaded the home page in Chromium as a 390px phone and a 1366px desktop, found the main button by its words (sign up, book a demo, get started and similar), tapped it once, and checked up to 3 pages for broken links and dead taps. Nothing was submitted. Each failed check costs the points shown. Full method.