A website can look professional and still fail to generate results. The difference between a site that converts and one that doesn't usually comes down to mistakes that seem minor but have a direct impact on user experience and business metrics. These are the five most frequent mistakes we see when auditing websites, and how to avoid them.
1. Not having a clear value proposition
The most common and most expensive mistake. A visitor lands on your site and, in less than 5 seconds, needs to understand three things: what you do, who you do it for, and why they should choose you. If your hero section is a generic line like "Innovative solutions for your business", you're losing visitors before they even scroll.
A value proposition is not an advertising slogan. It's a concrete statement that connects what you offer with your audience's specific problem. It should answer the question: "Why should I stay on this page?"
How to fix it: Write your value proposition using this structure: [What you do] + [for whom] + [what result they get]. For example: "We design digital interfaces that help startups turn more users into customers." It's specific, clear and benefit-driven.
2. Ignoring the mobile experience
In Argentina, more than 70% of web traffic comes from mobile devices. Yet most sites are designed for desktop first and then "adapted" to mobile. The result is illegible text, buttons that are impossible to tap, and forms that frustrate the user.
Mobile-first design isn't just a technical matter. It's a strategic decision. It means thinking about the experience starting from the smallest screen and then scaling up, not the other way around. This forces you to prioritize content, simplify navigation, and optimize every interaction for the real context most of your users are in.
How to fix it: Design for mobile first. Use a minimum font size of 16px, tap areas of at least 44x44 pixels, and test every critical flow on a real device, not just the browser simulator.
3. Not optimizing load speed
Google reports that 53% of mobile visits abandon a page that takes more than 3 seconds to load. Every additional second reduces conversion by between 7% and 20%. Speed isn't a technical detail; it's a business variable.
The main culprits tend to be uncompressed images, heavy fonts loaded unnecessarily, third-party scripts that block rendering, and the absence of lazy loading. Many of these problems originate in the design stage, not in development.
How to fix it: Compress every image to WebP format. Limit fonts to two families with strictly the weights you need. Use lazy loading for images and videos below the fold. Measure with Google PageSpeed Insights and aim for a score above 90 on mobile.
4. Weak or nonexistent calls to action
A site without clear CTAs is like a store with no "open" sign. The user may be interested, but if you don't tell them what to do next, they leave. And they don't always come back.
The most common CTA mistakes are: using generic text like "Submit" or "Click here", hiding the main button below too much content, failing to visually distinguish the primary action from the secondary one, and not repeating the CTA in the page's key sections.
How to fix it: Every page should have a clear goal and a main CTA that reflects it. Use specific action verbs: "Request your quote", "Book a call", "Download the guide". The button should have high contrast against the background and be visible without excessive scrolling.
5. Not measuring results
Designing a site and not measuring its performance is like launching a product and never talking to a customer. Without data, you're making decisions blindly. And what you don't measure, you can't improve.
The mistake isn't just the absence of analytics tools. It's the lack of a clear definition of what to measure. Before designing, you should be clear on your KPIs: conversion rate, time on page, bounce rate, scroll depth, CTA clicks. Each metric should be tied to a concrete business goal.
How to fix it: Install at least Google Analytics 4 and Google Search Console. Define conversion events for every important action. Set up a simple dashboard that you review weekly. And most importantly: use that data to make informed design decisions, not ones based on intuition.
These mistakes aren't exclusive to amateur sites. We see them in companies of every size, including some that invested significant budgets in their digital presence. The good news is that they're all fixable, and the return on investment from solving them is usually immediate.
"Simplicity is the ultimate sophistication."
— Leonardo da Vinci