How to compare design variants side by side for product designers in 2026

A step by step way for product designers to compare design variants side by side, from setting criteria to picking a winner, with tool options to check.

By 2Dex · 2026-10-09

2Dex is published by the makers of SageThumbs 2K, RēDesign and VectorMagik, which are compared here alongside other tools.

Put every variant next to the original at the same size, judge each one against criteria you wrote down first, and record your pick with a reason. RēDesign can show HTML redesigns of one screenshot from several AI models in a gallery beside the original. ^[1]

Option	What it does for comparing variants	Price
RēDesign	Shows HTML redesigns from several AI models for one screenshot in a gallery next to the original, and shows two results side by side with the AI model names hidden. ^[1] ^[2]	Free; you only pay the AI providers whose API keys, which are codes that let a tool use an AI service, you use. ^[3]
Design tool your team already uses	Not published; check whether it shows variants at the same size at the same time	Not published
Shared slide deck	Not published; check whether labels can be hidden and picks recorded	Not published

What you need before you start

A fair comparison starts with a fair setup. Gather these before you open any variant.

One original screen. Use a clean screenshot or export of the current design. Every variant is judged against it.
A written goal. Say what the screen must help a person do. A variant that looks fresh but hides the main action has not helped.
A short list of criteria. Pick a few things to judge, such as clarity of hierarchy, brand fit, readability and effort to build. Write them down so they do not shift while you look.
The same frame for every variant. Same screen size, same sample content, same state of the screen. Differences in setup will look like differences in design.
A place to record picks. A shared note or a table works. Add the variant name, your score per criterion and a reason in plain words.
Someone else's eyes. A second reviewer catches taste bias. Decide in advance how you will settle a disagreement.

If you plan to generate variants with AI, also have the access keys, which are codes that let a tool use an AI service, for the AI providers you want to use ready.

Step by step

These steps work in any tool, including a plain slide deck.

Fix the question. Write one sentence, such as: which version of this checkout screen makes the main action clearest?
Collect the variants. Put the original and every variant in one place. Name them in a way that tells you nothing about who made them.
Make the frames match. Give each variant the same size, the same sample text and the same images. Remove anything that is only there in one version unless it is the point of the test.
Lay them out together. Place variants in a row or grid with the original at the left. Keep them on screen at the same time, because memory is a poor judge of small differences.
Hide the source if you can. If you know which version came from which person or tool, you may favor it. Cover labels for a first pass.
Score against your criteria. Go through one criterion at a time across all variants, not one variant at a time across all criteria. This keeps the comparison even.
Check the hard requirements. Text contrast, tap target size and legibility are not matters of taste. Test them on each variant.
Compare in pairs. When many variants remain, pit two against each other, keep the winner and repeat. Pairs are easier to judge than a crowd.
Record the decision. Write which variant won, why, and what you would borrow from the others.
Hand off. Share the chosen variant with the reasons, so the people building it do not have to guess.

Tools that can do it

RēDesign is made by the team that publishes this site. It sends one UI screenshot to several AI models at the same time and shows the HTML redesigns they return in a gallery next to the original. ^[1] In one run you can ask each AI model for a different number of variants. ^[4]

For the judging steps, it shows you two outputs side by side with the AI model names hidden, and each pick you make updates a ranking of the AI models. ^[2] With one click it checks an output's text contrast against WCAG AA, a standard for readable text contrast. ^[5]

It comes with prompt presets such as faithful refresh, bold reimagine and minimalist, and you can also write your own prompts. ^[6] It shows an estimated cost before you start a run and tracks what each run costs. ^[7] You can download a whole run as a zip, or download a DESIGN.md file for the redesign you picked so a tool that helps write code can rebuild that look. ^[8]

On price, RēDesign is free; you only pay the AI providers whose API keys, which are codes that let a tool use an AI service, you use. ^[3] The packaged app is for Windows only; running it from source works on Windows, macOS or Linux, and needs Bun 1.2 or newer, which is a free tool for running JavaScript programs. ^[9]

Other options include the design tool your team already uses, or a shared slide deck. Check each option for the things that matter for your comparison: can it show variants at the same size at the same time, can names be hidden, and can you record a pick with a reason.

Common mistakes to avoid

Judging without criteria. Without written criteria, the loudest or newest variant tends to win. Write the list first.
Comparing unequal frames. A variant with better sample text or sharper images will look better for reasons that have nothing to do with the design.
Looking at one variant at a time. Flipping between tabs hides small differences. Keep them visible together.
Letting names bias the pick. Knowing the author or the tool changes how people rate work. Hide labels in the first round.
Skipping accessibility checks. A variant can look clean and still have text that is hard to read. Test contrast before you fall for it.
Ignoring cost and effort. Generated or hand drawn, a variant that is costly to build may not be the right pick. Note the effort beside the score.
Not recording why. A pick with no reason gets reopened in the next meeting. Write one line of reasoning per decision.
Taking the first result as final. Use the winner as a base, then borrow the strongest parts of the others.

Frequently asked questions

What is the simplest way to compare two design variants?

Put both at the same size on one screen, with the same sample content. Write two or three criteria first, such as clarity and readability. Score each variant per criterion, then note which one won and why. Keeping both visible at once matters more than the tool you use.

How to avoid bias when comparing design variants?

Hide the names of who or what made each variant for the first pass, and judge against criteria written beforehand. RēDesign shows two outputs side by side with the AI model names hidden. ^[2] A second reviewer also helps catch personal taste.

Can AI generated redesigns of a screenshot be compared side by side?

RēDesign sends one UI screenshot to several AI models at the same time and shows the HTML redesigns they return in a gallery next to the original. ^[1]

How to check if a design variant has readable text?

Test text contrast on each variant, not by eye alone. RēDesign has a one click check of an output's text contrast against WCAG AA, a standard for readable text contrast. ^[5] Whatever tool you use, run the same check on every variant.

Does RēDesign cost anything to use?

RēDesign is free; you only pay the AI providers whose API keys, which are codes that let a tool use an AI service, you use. ^[3] It also shows an estimated cost before you start a run and tracks what each run costs. ^[7]

RēDesign is free; you only pay the AI providers whose API keys you use. ^[3]

Try RēDesign

Sources

RēDesign's own description of itself (the product of this site's publisher)
RēDesign's own description of itself (the product of this site's publisher)
RēDesign's own description of itself (the product of this site's publisher)
RēDesign's own description of itself (the product of this site's publisher)
RēDesign's own description of itself (the product of this site's publisher)
RēDesign's own description of itself (the product of this site's publisher)
RēDesign's own description of itself (the product of this site's publisher)
RēDesign's own description of itself (the product of this site's publisher)
RēDesign's own description of itself (the product of this site's publisher)