Logo slider widget for trusted-by social proof.

Cialdini's social proof principle, articulated in his 1984 book Influence: The Psychology of Persuasion, predicts that humans look to others for cues on how to behave, especially in moments of uncertainty. Buying decisions are uncertainty moments. Spiegel Research at Northwestern quantified this in their 2017 e-commerce study, which is still the most-cited piece of academic work on online trust signals: pages that displayed third-party trust signals (including recognized client logos) lifted conversion 18-32% over a no-logos control, with the largest lift on higher-priced items where the perceived risk of a wrong decision was greatest. The reason a logo strip outperforms a testimonial block in the first viewport is processing fluency. A logo is a perceptual gestalt that the brain decodes in under 200ms; a testimonial requires reading 30 to 80 words and constructing meaning, which takes 4 to 10 seconds. Above the fold you have roughly 1.5 seconds of attention before the visitor decides to scroll or bounce, and a logo strip lands the trust signal inside that window. Testimonials and case studies belong below the fold, after the visitor has already committed to engaging. There is also a credibility transfer at work: when prospects see logos of brands they personally recognize and respect, they unconsciously import that recognition into their judgment of you. This is why a single recognized logo (Microsoft, Google, Shopify, Stripe) often does more work than ten unfamiliar ones. Curate your strip with intent. Three to five widely-recognized logos plus your tier-two clients in supporting positions is the formula that converts, not 50 unsorted brand marks dumped into a marquee.

Walk through Stripe, Vercel, Linear, Notion, Figma, Webflow, Plaid, and Anthropic's homepages. Every single client logo strip uses the same treatment: logos render in grayscale by default, fade to full color on hover. This is the industry standard, and it works for two reasons. First, color logos compete visually with your hero CTA (a strip of full-color brand marks pulls the eye away from the action you actually want visitors to take). Grayscale defuses that competition while still communicating the trust signal. Eye-tracking studies on landing pages consistently show that high-saturation elements pull the visitor's gaze regardless of where the page intends to direct attention; muting the logo strip to grayscale solves the problem without removing the social proof. Second, your client logos come from many different brand systems with clashing color palettes. A red logo next to a green logo next to a purple logo creates a visually noisy strip that reads as a circus tent, not a credibility statement. Rendering them in unified grayscale creates visual coherence the original mixed-color set cannot. The hover-to-color interaction adds delight without compromising the default state. It also serves a functional purpose: when a visitor pauses on a particular logo (the universal sign of curiosity), the color reveal rewards that micro-engagement and increases the odds of a click-through. Poper ships this treatment as a one-toggle setting; in DIY builds you have to write the CSS filter rule by hand on every logo, deal with edge cases like logos that already include grayscale, and re-test on every browser. The pattern is so well-established that not using it now reads as either inexperience or a deliberate stylistic break, both of which carry brand cost.

The Poper logo slider ships three layouts, and they are not interchangeable. The Ticker layout scrolls all your logos continuously in one direction at a speed you control, and pauses when a visitor hovers it. It is the right pick above the fold when you have many logos and want a sense of motion and breadth without spending much vertical space. The Carousel layout shows a set of logos at a time with navigation arrows, optional auto-slide on a delay, and bullet pagination, which works well when you want visitors to step through tiered groups of partners deliberately. The Grid layout lays every logo out in a static block with desktop and mobile column counts you set, and it is the right pick on press pages, footers, and any context where motion would be a distraction. A practical rule of thumb: ticker for breadth above the fold, carousel for deliberate stepping, grid for calm static placement deeper in the page. You can switch layouts in the builder at any time without re-uploading logos, so test which one converts on your actual page rather than guessing from the builder preview.

Walk through Stripe, Vercel, Linear, Notion, and Figma's homepages. Every client logo strip uses the same treatment: muted, unified logos rather than full-color brand marks. The Poper logo slider offers this through the logo-style control: Original keeps each logo as uploaded, Grayscale renders the whole strip in unified gray, and Custom applies a single tint color across every logo. Grayscale works for two reasons. First, full-color logos compete visually with your hero CTA; a strip of saturated brand marks pulls the eye away from the action you actually want visitors to take, and muting the strip defuses that competition while still landing the trust signal. Second, your client logos come from many brand systems with clashing palettes, and a red logo next to a green one next to a purple one reads as visual noise rather than a credibility statement. Rendering them all in unified gray (or a single brand tint) creates coherence the original mixed-color set cannot. All three styles are CSS treatments applied at render time, so your original uploaded files are never altered. If a particular logo looks weak in grayscale, the Original or Custom option lets you keep it readable without changing the rest of the strip.

Two formats compete for the trusted-by job, and they are not interchangeable. A logo slider (this widget) auto-scrolls horizontally, fits in a single row above the fold, and showcases 5-50 logos in compact horizontal space. A customer logos wall is a static grid, fits 12-50 logos in a 3-5 row block, and lives further down the page (often as a dedicated section between the feature grid and the testimonials). The slider wins when you have many logos and limited vertical space, when you are above the fold, when motion adds energy to a calm hero design, and when you want to showcase breadth (many partners) without sacrificing first-viewport real estate. The wall wins when you have a few high-value logos you want to feature equally without motion, when you are deeper in the page where vertical space is no longer scarce, when you are pairing the logos with case study links or short quote pull-outs, and when you are targeting accessibility-conservative audiences (government, education, healthcare) where motion is best minimized regardless of WCAG technical compliance. Many sites use both: a slider in the hero for breadth, a wall further down for depth, and individual logos embedded inline within case study cards for narrative emphasis. The composite pattern compounds the social proof effect across the page without ever feeling repetitive. If your logo set is under 8 brands, skip the slider and use a static row instead. Auto-scroll on a tiny set looks unconfident, like you are trying to pad the lineup, and visitors notice. The marquee should always feel like there are more logos than you can fit, never like there are fewer than you wish you had. A practical rule of thumb: marquee with 12 or more logos, static row with 5 to 11, and skip the strip entirely with under 5 (in which case place the logos inline with quotes from each customer instead). The right format follows from your logo inventory and page intent, not from what looks cool in the builder preview.