A plain record beats a remembered impression
Comparing two assistants from memory a week later is unreliable; a saved image of the exact answer is not. PrintScreen (printscreen.ai) is a free Windows app: press Prt Scr, select an area of the screen, then copy it, save it, or generate a short link. It is Windows 10 and 11 only, free forever, with no watermark.
If you are testing whether a new assistant is actually better than the one you use now, a plain screenshot of the exact wording is more useful later than a general sense of which one felt smarter at the time.
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Why a memory of the answer is not enough
A week after testing two assistants side by side, what stays with you is an impression, not the exact phrasing, and impressions are easy to talk yourself out of. Keeping the literal text as it was shown removes that problem: you can reread the actual answer instead of trying to recall how good it seemed.
The mechanics of a capture
It is a free app for Windows 10 and 11. Press the Prt Scr key, drag to select the part of the screen you want, and the capture is done. From there, copy the image to paste elsewhere, save it as a file, or generate a short shareable link. There is no trial period and no watermark on the output, since it is free forever rather than free with a catch.
Where it does not run
PrintScreen is Windows only. On macOS or Linux, printscreen.ai's own site points you toward each system's built-in screenshot tools instead of offering an app for it. If your comparison work happens across different machines, plan for that split rather than assuming one tool covers everything.
What it will not do for you
It does not join a long, scrolling answer into a single tall image, so a long response may need more than one capture. There is no arrow tool or added text for marking the image up afterward, no blur for hiding anything sensitive, and no OCR for pulling text back out of a saved image. It also keeps no cloud library; the files live wherever you save them.
Building a usable comparison
Ask both assistants the same question, capture each answer as it appears, and name the files with the assistant, the date and the prompt so a later search finds them. Because there is no built-in way to combine or mark up captures, keep your notes about what you were testing in a separate text file next to the images rather than relying on the screenshots to explain themselves.
Filing the record somewhere durable
A folder of screenshots on one laptop is not much more durable than memory if that machine is replaced. Once a comparison is finished, move the images and their notes to storage you would still have access to after switching machines, since the whole point of keeping them was to outlast a single session of testing.