#37B4FE
Closest named color: Deep Sky Blue (#00BFFF). oklch(73.6% 0.151 240.2), rgb(55, 180, 254).
Aa
Black text reads best on this color (9.12:1).
About this color
#37B4FE is a medium-light, vivid blue. In OKLCH its lightness is 74%, its chroma 0.151 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.030 away. Black text reads best on it, at 9.12:1.
| Hue family | Blues |
| Lightness | medium-light (74%) |
| Chroma | vivid (0.151) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.12:1 |
| White text | 2.30:1 |
Values
| HEX | #37B4FE |
| RGB | rgb(55, 180, 254) |
| HSL | hsl(202, 99%, 61%) |
| OKLCH | oklch(73.6% 0.151 240.2) |
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 #37B4FE | 2.30:1 | Fails | Lc -49.8 | Large or bold text, headings |
| Black text on #37B4FE | 9.12:1 | AAA | Lc 59.0 | Large or bold text, headings |
| #37B4FE text on white | 2.30:1 | Fails | Lc 45.0 | Non-text elements, placeholder text |
| #37B4FE text on black | 9.12:1 | AAA | Lc -57.2 | 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
#EEF7FD
oklch(97.1% 0.013 236.6)
-
Step 100
100
#DAEDFB
oklch(93.6% 0.028 239.7)
-
Step 200
200
#BBDFF9
oklch(88.6% 0.052 239.6)
-
Step 300
300
#87C9F8
oklch(80.9% 0.095 240.4)
-
Step 400
400 (this color)
#37B4FE
oklch(73.6% 0.151 240.2)
-
Step 500
500
#0092D8
oklch(63% 0.146 240.6)
-
Step 600
600
#007BB6
oklch(55.6% 0.128 240.2)
-
Step 700
700
#00679A
oklch(49.1% 0.113 240.5)
-
Step 800
800
#00547F
oklch(42.6% 0.099 240.7)
-
Step 900
900
#00466B
oklch(37.7% 0.087 240.8)
-
Step 950
950
#002A41
oklch(27.1% 0.061 239)
#37B4FE 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) | #91B5FF | 0.077 |
| Deuteranopia (no green cones) | #76A3FD | 0.060 |
| Tritanopia (no blue cones) | #00C7CE | 0.101 |
| Achromatopsia (no color) | #ABABAB | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37B4FE
#37B4FE
oklch(73.6% 0.151 240.2)
- #ED9036
#ED9036
oklch(73.6% 0.15 60.2)
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 #37B4FE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.030
- Bright Sky Blue #02CCFE ΔE 0.065
- Vivid Sky Blue #4CC9F0 ΔE 0.069
- Carolina Blue #8AB8FE ΔE 0.070
- Chefchaouen Blue #4895EF ΔE 0.081
- Cornflower Blue #6495ED ΔE 0.082
- Lightblue #7BC8F6 ΔE 0.082
- Turquoise Blue #06B1C4 ΔE 0.089
Use #37B4FE 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.