# How Many Signup and Login Screen Experiments Do Top Apps Run?

Source: Lazyweb Research
Published: 2026-07-07
Sample size: n=347
Tags: signup, experiments, ux-patterns, design, mobile
HTML: https://www.lazyweb.com/research/how-many-auth-screen-experiments-tracked
Markdown: https://www.lazyweb.com/research/how-many-auth-screen-experiments-tracked.md

**Answer.** Lazyweb Research detected 347 before/after auth-screen experiments across 85 companies in the tracked corpus[1]. Observed changes cluster around brand-first welcome redesigns, provider-button contrast, pre-filled inputs, and moving incentives onto the signup form itself[2]. These are observed UI changes with inferred rationale, not measured conversion lift — use them as a pattern library, not as proof of what wins.

> 347 detected auth-screen experiments across 85 companies — Lazyweb Research, July 2026.

## The finding

Across the corpus, **347 before/after UI experiments** were detected on signup/login screens, spanning **85 companies**[1]. That is a high experimentation rate for a single surface, underscoring that the auth screen is one of the most actively tested moments in a mobile funnel. Each detection is a captured visual diff plus an LLM-inferred rationale — not a measured result[2].

## Observed change patterns

Recurring, real observed changes in the detected set include:

- **Brand-first welcome redesigns** — replacing avatar/profile entry cards with a centered-logo welcome plus Google/Apple buttons and a prominent email CTA (observed at Yelp and CapCut)[2].
- **Incentive on the form** — swapping a marketing carousel for a signup form carrying a concrete discount, e.g. 'up to 40% off your first order' (observed at DoorDash)[2].
- **Pre-filled vs neutral inputs** — pre-filled example phone numbers and numeric keypads tested against empty/neutral placeholders (observed at Cash App and Crumbl)[2].
- **Provider-button contrast** — social buttons shifted to higher-contrast light-on-dark styling for easier tapping (observed at Ancestry)[2].

## How to apply it

Use these as a hypothesis backlog for your own auth screen: brand-first welcome, incentive-on-form, input pre-fill, and button contrast are the moves peers are actively testing. But run your own A/B test before believing any direction — the corpus records that a change happened and infers why, not whether it lifted conversion. Note some diffs reverted (e.g. Cash App reverting a pre-filled placeholder to empty), which is itself a signal that these are genuinely uncertain bets.

## Caveats

The 347 count is detected before/after diffs, not confirmed live experiments, and rationales are LLM-inferred[2]. Company anecdotes here are drawn only from the recorded qualitative diffs; no lift figures exist in this dataset, so do not treat any pattern as a proven winner.

## The numbers

| Stat | Computed from |
| --- | --- |
| 347 detected auth-screen experiments across 85 companies | auth_experiments_count stat |
| observed change patterns (brand-first welcome, incentive-on-form, pre-filled vs neutral inputs, button contrast) | qualitative diffs: yelp, capcut, doordash, cash-app, crumbl, ancestry |

## Methodology

Universe: 347 detected before/after auth-screen diffs across 85 companies in the Lazyweb corpus, July 2026. Key caveat: observed changes with inferred rationale, never measured lift.

## Sources & citations

- [1] Lazyweb Research analysis of 347 detected auth-screen experiments across 85 companies, July 2026. Before/after UI diffs on signup/login screens; detected changes, not measured conversion lift.
- [2] Lazyweb Research analysis of qualitative auth-screen diffs (Yelp, CapCut, DoorDash, Cash App, Crumbl, Ancestry), July 2026. Observed visual changes with LLM-inferred rationale; some diffs later reverted.

## Related questions

- [How Many Auth Options Does the Typical Signup Screen Show?](https://www.lazyweb.com/research/auth-options-per-signup-screen-count)
- [Should a Signup Screen Offer Both Apple and Google, or Just One?](https://www.lazyweb.com/research/apple-and-google-both-or-one)
- [Sign Up vs Sign In: How Many Steps Does Each Take?](https://www.lazyweb.com/research/signup-vs-signin-how-many-steps)