#37B1EB
Closest named color: Deep Sky Blue (#00BFFF). oklch(72% 0.134 234.2), rgb(55, 177, 235).
Aa
Black text reads best on this color (8.65:1).
About this color
#37B1EB is a medium-light, moderately saturated blue. In OKLCH its lightness is 72%, its chroma 0.134 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.041 away. Black text reads best on it, at 8.65:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.65:1 |
| White text | 2.42:1 |
Values
| HEX | #37B1EB |
| RGB | rgb(55, 177, 235) |
| HSL | hsl(199, 82%, 57%) |
| OKLCH | oklch(72% 0.134 234.2) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #37B1EB | 2.42:1 | Fails | Lc -52.4 | Large or bold text, headings |
| Black text on #37B1EB | 8.65:1 | AAA | Lc 56.6 | Large or bold text, headings |
| #37B1EB text on white | 2.42:1 | Fails | Lc 47.4 | Large or bold text, headings |
| #37B1EB text on black | 8.65:1 | AAA | Lc -54.6 | Large or bold text, headings |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 400.
-
Step 50
50
#EFF7FC
oklch(97.2% 0.011 234.8)
-
Step 100
100
#DBEDF8
oklch(93.6% 0.024 234.4)
-
Step 200
200
#BCDFF4
oklch(88.5% 0.047 234.4)
-
Step 300
300
#8ACAEF
oklch(80.9% 0.084 234.6)
-
Step 400
400 (this color)
#37B1EB
oklch(72% 0.134 234.2)
-
Step 500
500
#0095CD
oklch(63.1% 0.132 234.2)
-
Step 600
600
#007DAD
oklch(55.6% 0.117 234.3)
-
Step 700
700
#006992
oklch(49.1% 0.103 234.3)
-
Step 800
800
#005678
oklch(42.7% 0.089 233.9)
-
Step 900
900
#004865
oklch(37.8% 0.079 233.7)
-
Step 950
950
#002A3E
oklch(26.9% 0.057 235.2)
#37B1EB with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #95B0EE | 0.084 |
| Deuteranopia (no green cones) | #7C9FEA | 0.069 |
| Tritanopia (no blue cones) | #00C0C5 | 0.082 |
| Achromatopsia (no color) | #A6A6A6 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37B1EB
#37B1EB
oklch(72% 0.134 234.2)
- #E48B4C
#E48B4C
oklch(71.9% 0.134 54)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #37B1EB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.041
- Turquoise Blue #06B1C4 ΔE 0.063
- Vivid Sky Blue #4CC9F0 ΔE 0.069
- Bright Sky Blue #02CCFE ΔE 0.072
- Chefchaouen Blue #4895EF ΔE 0.078
- Cornflower Blue #6495ED ΔE 0.079
- Carolina Blue #8AB8FE ΔE 0.080
- Greyblue #77A1B5 ΔE 0.087
Use #37B1EB in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.