UV Index Reference - Online Exposure Category & Protection
See the current UV index forecast or enter a value to learn protection needed (SPF, hat, shade). Educational.
UD5 Toolkit
Find the perfect lens tint for your activity and lighting conditions. Expert recommendations backed by optical science.
The most natural color perception. Excellent for driving and everyday use in bright conditions.
VLT: 10–20% | Category 3Best For: Driving, everyday, bright sun
Pros: True color perception, reduces overall brightness evenly
Note: Not ideal for low-light or flat-light conditions
Best For: Fishing, skiing, driving, golf
Pros: Enhances contrast, depth perception, blocks blue light
Note: Slightly warm color cast; excellent with polarized option
Best For: Golf, tennis, baseball, general outdoor
Pros: Reduces glare, preserves color balance, soothing
Note: Classic Ray-Ban G-15 style; versatile all-rounder
Best For: Night driving, skiing flat light, overcast
Pros: Maximizes contrast in low light, filters blue haze
Note: Not for bright sun; can distort color perception
Best For: Skiing, cycling, running, snow sports
Pros: Boosts depth perception, sharpens contrast on snow
Note: Can be fatiguing in very bright light; great for variable conditions
Best For: Beach, water sports, fashion
Pros: Reduces glare off water, stylish look
Note: Slight color shift; less ideal for color-critical tasks
Best For: High altitude, water sports, bright snow
Pros: Maximum glare reduction, reflects infrared heat
Note: Category 4 may not be legal for driving in some regions
Best For: Variable conditions, everyday transitions
Pros: Adapts to UV light automatically, convenient
Note: Slower response in cold weather; may not darken inside cars
Best For: Night driving, indoor, screen work
Pros: Maximum light transmission, zero color distortion
Note: Use only for protection (UV/impact); no glare reduction
All lens recommendations assume 100% UV400 protection. Always verify UV protection independently of tint darkness.
See the current UV index forecast or enter a value to learn protection needed (SPF, hat, shade). Educational.
Enter your body weight to get the standard recommendation: a bag roughly half your weight. Also see filling material options.
Enter your cup size and planned activity to find the recommended encapsulation vs compression style and support level.
Based on your mouth size and any TMJ issues, choose a standard, small, or orthodontic mouthpiece for comfortable snorkeling.
Describe your equalization difficulty and current technique to get a recommendation for which advanced method (Frenzel, BTV) to learn next.
Compare the speed and tangle‑resistance of different methods for packing a throw rope. Choose the best for your PFD.
Based on your hand size and any joint issues, choose between standard, small‑diameter, or ergonomic paddle shafts.
Based on the route's wandering nature and your rope diameter, see whether to rack short or long quickdraws to reduce drag.
Answer a few questions about your strength and the type of wood you split to get a maul weight recommendation (4 lb to 8 lb).
Enter your height and see whether a low‑style, standard, or high‑back camp chair will be easiest to get in and out of.
Enter two CSS selectors and see which one wins in a specificity battle. Displays the (a,b,c) score and explains why one overrides the other.
Answer where you're sealing (shower, window, baseboard) to get the right type of caulk (100% silicone, acrylic latex, etc.). Avoid moldy seals.
Select your project material (wood, metal, brick) and location (indoor/outdoor) to choose the safest and most effective paint remover. Check for hazardous chemicals.
Select playing style (rhythm, lead, strumming) and string gauge to get the recommended pick thickness in mm.
Enter air and snow temperature plus humidity to get the right glide wax color (Swix/Toko). Perfect kick and glide.
Enter material thickness and get the recommended pop rivet diameter and grip range.
Answer simple questions (braid/mono, hook/swivel) to see the recommended fishing knot with step‑by‑step animation.
Answer questions about project type and strength needed to get a joint recommendation. Animations.
Apply a color tint overlay over text to see if it helps reading comfort. Trial for visual stress.
Write compound selectors and instantly see which elements they match on a test page. Master complex CSS logic.
Apply a customizable gradient overlay to any image. Perfect for banners and social media. Download the result. Local.
Slide left for cooler (blue) or right for warmer (orange) tones on your image. Quick photo adjustment. Local.
Apply real-time CSS filters or canvas effects to a video and download the processed output. Experiment with video post-processing locally.
Generate tints (add white) and shades (add black) for any base hex color. Copy values for design systems. Instant local generation.