#37A4DA
Closest named color: Turquoise Blue (#06B1C4). oklch(68.1% 0.125 234.8), rgb(55, 164, 218).
Aa
Black text reads best on this color (7.48:1).
About this color
#37A4DA is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.125 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.058 away. Black text reads best on it, at 7.48:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 7.48:1 |
| White text | 2.80:1 |
Values
| HEX | #37A4DA |
| RGB | rgb(55, 164, 218) |
| HSL | hsl(200, 69%, 54%) |
| OKLCH | oklch(68.1% 0.125 234.8) |
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 #37A4DA | 2.80:1 | Fails | Lc -58.9 | Large or bold text, headings |
| Black text on #37A4DA | 7.48:1 | AAA | Lc 50.4 | Large or bold text, headings |
| #37A4DA text on white | 2.80:1 | Fails | Lc 53.6 | Large or bold text, headings |
| #37A4DA text on black | 7.48:1 | AAA | Lc -48.2 | 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
#EFF7FC
oklch(97.2% 0.011 234.8)
-
Step 100
100
#DCEDF7
oklch(93.6% 0.023 233.4)
-
Step 200
200
#BEDEF2
oklch(88.4% 0.044 235.4)
-
Step 300
300
#8EC9EC
oklch(80.8% 0.078 235.1)
-
Step 400
400 (this color)
#37A4DA
oklch(68.1% 0.125 234.8)
-
Step 500
500
#0095CE
oklch(63.2% 0.133 234.7)
-
Step 600
600
#007DAE
oklch(55.7% 0.118 234.9)
-
Step 700
700
#006993
oklch(49.2% 0.104 234.9)
-
Step 800
800
#005679
oklch(42.8% 0.09 234.7)
-
Step 900
900
#004765
oklch(37.6% 0.08 234.9)
-
Step 950
950
#002A3E
oklch(26.9% 0.057 235.2)
#37A4DA 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) | #8AA3DD | 0.077 |
| Deuteranopia (no green cones) | #7493D9 | 0.065 |
| Tritanopia (no blue cones) | #00B2B6 | 0.078 |
| Achromatopsia (no color) | #9A9A9A | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37A4DA
#37A4DA
oklch(68.1% 0.125 234.8)
- #D38247
#D38247
oklch(68.1% 0.125 54.9)
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 #37A4DA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.058
- Chefchaouen Blue #4895EF ΔE 0.058
- Cornflower Blue #6495ED ΔE 0.064
- Dark Sky Blue #448EE4 ΔE 0.066
- Greyblue #77A1B5 ΔE 0.071
- Faded Blue #658CBB ΔE 0.073
- Deep Sky Blue #00BFFF ΔE 0.080
- Cadet Blue #5F9EA0 ΔE 0.085
Use #37A4DA 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.