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The HMX Bad Sweetheart and MMD Vivian switches are both standard MX mechanical switches of the linear breed. They both feature PA12 top housing, standard stem shape, 2 mm pre-travel, however, they come with different bottom housing (P4 vs PUM (modified)), stem material (T5 vs UPE (modified)), actuation (45 g vs 43 g), bottom-out force (50 g vs 48 g), total travel (3.80 mm vs 3.60 mm). That said, they are only slightly similar. Let's check out this side-by-side specs rundawn with details, availability -- and even current prices -- to figure out which one fits you the best!
The HMX Bad Sweetheart is a linear standard MX mechanical switch with PA12 top housing, P4 bottom housing, and T5 stem (standard shape). It features a 22 mm KOS single-stage extended spring. The 45g actuation occurs at 2mm. The 50g bottom-out occurs at 3.80mm. Factory lubing? Yes! Designed by RENA LAB. Manufactured by HMX. | The MMD Vivian is a linear standard MX mechanical switch with PA12 top housing, PUM (modified) bottom housing, and UPE (modified) stem (standard shape). The 43g actuation occurs at 2mm. The 48g bottom-out occurs at 3.60mm. Extra: Light diffuser. Factory lubing? Yes! Manufactured by MMD. |
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| Name | HMX Bad Sweetheart | MMD Vivian |
|---|---|---|
| Type | linear | linear |
| Footprint | 5-pin | 5-pin |
| Top housing | PA12 | PA12 |
| Bottom housing | P4 | PUM (modified) |
| Stem material | T5 | UPE (modified) |
| Stem shape | standard | standard |
| Spring | 22 mm KOS single-stage extended | - |
| Actuation | 45 g | 43 g |
| Bottom-out | 50 g | 48 g |
| Pre-travel | 2 mm | 2 mm |
| Total travel | 3.80 mm | 3.60 mm |
| Lube | Factory lubing? Yes! Mixed GPL105&GPL205 on leaf spring, stem feet, and bottom housing rails. | Factory lubing? Yes! |
| Designer | RENA LAB | - |
| Manufacturer | HMX | MMD |
By tracking prices and in-stock status of 30+ well-known keyboard stores worldwide, we can state that the HMX Bad Sweetheart is much more widely available, but the MMD Vivian is also available in stores.
Clicking the links below take you to some notable keyboard shops offering HMX Bad Sweetheart and MMD Vivian switches. When accepted, the prices indicated already include the discount - use the KBDNEWS coupon code at checkout to claim your saving!
Prices, discounts, and stock status are checked regularly; however, changes since the last update cannot be ruled out. Everything here is for informational purposes only. Check the product pages for the latest prices!
Comments on HMX Bad Sweetheart switches | Comments on MMD Vivian switches |
The Bad Sweetheart switch designed by Rena Lab is one of the deepest sounding HMX switches so far; Thanks to the T5 UPE blend stem, the spherical stem tip, and the new P4 bottom housing molding, they don't sound like your usual HMX type. The new P4 bottom housing comes with as less fiberglass as possible in order to eliminate the clacky tone from the sound profile. If you are a fan of deep and thocky sounding switches that are not muted, the Bad Sweetheart switches would be a great option – Unikeys. | MMD Vivian linear switch delivers a satisfying thocky sound profile. The switch features a modified UPE stem that enhances durability. Its top housing is constructed from PA12, while the bottom housing uses modified PUM – Lume Keebs. |
