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Web Vs Mobile: Which Page Areas Do Companies A/B Test On Each?

  • By Ali Abouelatta
  • n = 2,160
  • Published
  • Updated
  • 2 min read
  • web · mobile · experiments · paywall · landing-page · ux-patterns
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Short answer

Across 2,160 area-annotated experiments tracked by Lazyweb Research (1,280 mobile / 880 web), the tested surfaces split cleanly by platform: NAV, FORM, and ANNOUNCEMENT BAR are essentially 100% web, while OFFER (85% mobile), PRICING (84% mobile), and HEADER (100% mobile) are paywall-driven mobile areas source[1]source[2]. The hero is the one area both platforms test heavily, splitting 272 web / 216 mobile source[3]. Detected experiments overall are 92% mobile (4,449 of 4,814), so web reads are absolute counts only source[4].

The quotable stat
NAV, FORM and ANNOUNCEMENT BAR are 100% web while OFFER and PRICING run ~85% mobile — Lazyweb Research analysis of 2,160 annotated experiments (1,280 mobile / 880 web), July 2026.

Bar chart · Mobile

Mobile — Where each platform concentrates

One block is about 9.1 Mobile

NAV
0
FORM
0
ANNOUNCEMENT BAR
0
OFFER
255
PRICING
254
HERO
216
CTA
141
SOCIAL PROOF
14

The finding: platforms test different real estate

Of the 2,160 annotations, 1,280 are mobile (from 147 companies) and 880 are web (from 106 companies) source[1]. The area mix differs sharply by platform: web owns NAV (all 144), FORM (all 37), and ANNOUNCEMENT BAR (all 63), while mobile owns the monetization furniture — OFFER runs 255 mobile / 46 web, PRICING 254 mobile / 47 web, and HEADER is 100% mobile (29) source[2]source[3]. That reflects what each surface is for: mobile experiments concentrate on paywalls, web experiments on marketing pages source[2].

Where each platform concentrates

Selected areas by platform split source[2]source[3]:

AreaMobileWebSkew
NAV0144web-only
FORM037web-only
ANNOUNCEMENT BAR063web-only
OFFER25546~85% mobile
PRICING25447~84% mobile
HERO216272mixed
CTA14191mostly mobile
SOCIAL PROOF1434web-leaning

HERO is the shared battleground, tested heavily on both source[3].

How to apply it

Match your test backlog to your platform's tested surfaces: on mobile, the corpus concentrates on offer framing and pricing inside the paywall; on web, on nav de-chroming, hero, and signup forms source[2]source[3]. If you run both, the hero is the one area worth testing on each — it is the only high-volume area split roughly evenly source[3]. Don't force web-only patterns (announcement bars, nav cuts) onto a mobile paywall, or vice versa source[2].

Caveats

Detected experiments are 92.4% mobile (4,449) vs 7.6% web (365), so the web corpus is thin and its area cuts are absolute counts only, not percentage league tables source[4]. Platform splits are annotation counts, not lift source[4]. Company counts overlap across platforms source[1].

Real in-market screens

Screens from real, in-market apps, tracked by Lazyweb Research.

  • Translate Now paywall screen — real in-market example tracked by Lazyweb Research
    Translate Now1206 × 2622opens the full image
  • The Gaurdian Sign in screen — real in-market example tracked by Lazyweb Research
    The Gaurdian602 × 1308opens the full image
  • Spotify Account Setup screen — real in-market example tracked by Lazyweb Research
    Spotify1125 × 2436opens the full image
  • Epoch Times Onboarding screen — real in-market example tracked by Lazyweb Research
    Epoch Times1290 × 2796opens the full image

The numbers

#StatComputed from
[1]2,160 annotations = 1,280 mobile (147 companies) + 880 web (106 companies)platform_split_annotations; universe
[2]Web-only areas: NAV (144), FORM (37), ANNOUNCEMENT BAR (63). Mobile-heavy: OFFER 255/46, PRICING 254/47, HEADER 29 all mobileplatform_area_split; area_NAV; area_FORM; area_ANNOUNCEMENT_BAR; area_OFFER; area_PRICING; area_HEADER
[3]HERO 272 web / 216 mobile; CTA 141 mobile / 91 web; SOCIAL PROOF 34 web / 14 mobilearea_HERO; area_CTA; area_SOCIAL_PROOF
[4]Detected experiments: mobile 4,449 (92.4%) / web 365 (7.6%) of 4,814platform_split_experiments

Methodology

Universe is 2,160 area annotations (1,280 mobile / 880 web) over 1,126 detected experiments within 4,814 detected experiments in the ~800 tracked-apps corpus. Splits are annotation counts from LLM-annotated before/after screenshots, July 2026; web is thin, so web cuts are absolute counts only.

Sources

  1. [1]

    Lazyweb Research analysis of 2,160 annotated experiments (~800 tracked apps), July 2026

    Platform split of area annotations; 1,280 mobile / 880 web.

    Back to text

  2. [2]

    Lazyweb Research analysis of platform-by-area splits (~800 tracked apps), July 2026

    Per-area mobile/web counts within 2,160 annotations.

    Back to text

  3. [3]

    Lazyweb Research analysis of per-area platform counts (~800 tracked apps), July 2026

    HERO/CTA/SOCIAL PROOF web-mobile breakdowns.

    Back to text

  4. [4]

    Lazyweb Research analysis of 4,814 detected experiments (~800 tracked apps), July 2026

    Web is thin (365 experiments); web cuts are absolute counts only.

    Back to text

Source: Lazyweb Research — proprietary analysis of real, in-market app screens. Cite as Lazyweb Research, 2026-07-07.

Explore the evidence

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