In early 2020, Razer released the Viper Mini to great acclaim: Small, lightweight, optical switches for the main buttons, and equipped with a serviceable sensor. To this day, the $39.99 Viper Mini remains a strong budget recommendation. Accordingly, it comes as no surprise that clones find their way onto the market, such as the Genesis Krypton 750.

In terms of shape, the Krypton 750 indeed is 99.5% identical to the Viper Mini. The same goes for the weight: By default, the Krypton 750 comes with a perforated back cover and clocks in at 60 g. With the optional solid back cover, the weight goes up to 62 g, achieving near-parity with the Viper Mini. When it comes to the buttons, the Krypton 750 goes a different route than the Viper Mini. Instead of optical switches, regular mechanical switches are used for the main buttons. Since the Viper Mini has one of the better optical switch implementations, going mechanical doesn't provide much of a benefit in terms of click feel. Thankfully, click latency is very low on the Krypton 750 as well. The side buttons too are very good, and while the scroll wheel is rather noisy, tactility is on point. Whereas the Viper Mini comes with pure PTFE feet of excellent quality, the Krypton 750 is only outfitted with standard black-dyed PTFE feet, but at least there is a replacement set of white-dyed feet included, which is always handy. Lastly, the cable is a clear upgrade over the Viper Mini: While not top-tier, flexibility is firmly above average.

Another thing that distinguishes the Krypton 750 from the Viper Mini is the weight system. Usually, I'm quite critical of weight adjustment systems on mice since I see little point in adding even more weight to an oftentimes already heavy enough mouse, as is typically the case. The Krypton 750, on the other hand, has weight adjustment "done right": Starting from a low weight, more weight can be added in small increments. Furthermore, the weight compartment is mostly centered, so adding weights doesn't offset the weight balance too much. The customization extends to the software, which has all the important options, uses little resources, and works without issues. The RGB lighting too can be adjusted to one's heart's content, and is richer than what is offered by the Viper Mini.

The only area where the Krypton 750 falls off is sensor performance. While the Viper Mini caught some flak for the high lift-off distance of its PAW3359 sensor, general performance was great, providing great tracking, low motion delay, and minimal CPI deviation. Unfortunately, the same cannot be said about the Krypton 750. The PAW3333 is used, which is likely based on the PAW3327 and too is a budget sensor. And sure enough, general tracking is fine, polling stable across the board, and LOD a bit lower than on the Viper Mini. Not so great are CPI deviation and motion delay, however. In regards to the former, getting an accurate 400 CPI step is impossible as that step is way off, and the 3333 only allows for CPI adjustment in increments of 100. CPI deviation in general seems to be all over the place, in that some steps are on target while others aren't even close to it. Motion delay isn't particularly consistent either: At 1600 CPI, I could measure a motion delay of roughly 1.5 ms, which isn't much but certainly unnecessary and unwarranted on a regular wired mouse. At higher steps above 5000 CPI, motion delay is somewhere between 3–6 ms, but results weren't consistent, so I can't tell for sure. Either way, the Viper Mini is flawless in this regard, whereas the Krypton 750 isn't.

Truthfully, this wouldn't be much of an issue if it weren't for one thing: the price. At $44.99, the Krypton 750 costs $5 more than the Viper Mini, but without being the better mouse. The cable is a bit more flexible, LOD is slightly lower, and there is a weight system, but the Viper Mini has better sensor performance, optical main button switches, and better feet. Unless someone specifically wants a heavier Viper Mini or avoid Razer Synapse at all costs, there is simply little reason to pick the Krypton 750 over the Viper Mini. Frankly, I'm not sure which market segment Genesis had in mind when determining the pricing on the Krypton 750. For instance, I could get the SPC Gear GEM Plus with a 3370 for $44.99, and mice with comparable sensors such as the SteelSeries Rival 3 or ROCCAT Burst Core are priced at $29.99. The Genesis Krypton 750 is not a bad mouse, but too expensive for what is on offer. For $34.99, I'd be willing to hand out our Recommended award, but not for $44.99.