#37ADE4
Closest named color: Deep Sky Blue (#00BFFF). oklch(70.7% 0.129 233.5), rgb(55, 173, 228).
Aa
Black text reads best on this color (8.26:1).
About this color
#37ADE4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 71%, its chroma 0.129 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.054 away. Black text reads best on it, at 8.26:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.26:1 |
| White text | 2.54:1 |
Values
| HEX | #37ADE4 |
| RGB | rgb(55, 173, 228) |
| HSL | hsl(199, 76%, 55%) |
| OKLCH | oklch(70.7% 0.129 233.5) |
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 #37ADE4 | 2.54:1 | Fails | Lc -54.5 | Large or bold text, headings |
| Black text on #37ADE4 | 8.26:1 | AAA | Lc 54.6 | Large or bold text, headings |
| #37ADE4 text on white | 2.54:1 | Fails | Lc 49.4 | Large or bold text, headings |
| #37ADE4 text on black | 8.26:1 | AAA | Lc -52.5 | 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
#DBEDF7
oklch(93.6% 0.023 231.8)
-
Step 200
200
#BDDFF3
oklch(88.5% 0.045 233.8)
-
Step 300
300
#8BCAED
oklch(80.9% 0.081 233.5)
-
Step 400
400 (this color)
#37ADE4
oklch(70.7% 0.129 233.5)
-
Step 500
500
#0095CC
oklch(63.1% 0.132 233.7)
-
Step 600
600
#007DAC
oklch(55.5% 0.116 233.8)
-
Step 700
700
#006991
oklch(49% 0.102 233.6)
-
Step 800
800
#005678
oklch(42.7% 0.089 233.9)
-
Step 900
900
#004864
oklch(37.8% 0.078 232.8)
-
Step 950
950
#002A3D
oklch(26.9% 0.056 233.8)
#37ADE4 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) | #92ACE7 | 0.082 |
| Deuteranopia (no green cones) | #7B9BE3 | 0.069 |
| Tritanopia (no blue cones) | #00BCC0 | 0.080 |
| Achromatopsia (no color) | #A2A2A2 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37ADE4
#37ADE4
oklch(70.7% 0.129 233.5)
- #DE884D
#DE884D
oklch(70.6% 0.129 53.4)
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 #37ADE4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.054
- Turquoise Blue #06B1C4 ΔE 0.056
- Chefchaouen Blue #4895EF ΔE 0.071
- Cornflower Blue #6495ED ΔE 0.074
- Greyblue #77A1B5 ΔE 0.078
- Vivid Sky Blue #4CC9F0 ΔE 0.080
- Bright Sky Blue #02CCFE ΔE 0.084
- Dark Sky Blue #448EE4 ΔE 0.085
Use #37ADE4 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.