#37A5DA
Closest named color: Turquoise Blue (#06B1C4). oklch(68.4% 0.124 234.1), rgb(55, 165, 218).
Aa
Black text reads best on this color (7.55:1).
About this color
#37A5DA is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.124 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.056 away. Black text reads best on it, at 7.55:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 7.55:1 |
| White text | 2.77:1 |
Values
| HEX | #37A5DA |
| RGB | rgb(55, 165, 218) |
| HSL | hsl(200, 69%, 54%) |
| OKLCH | oklch(68.4% 0.124 234.1) |
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 #37A5DA | 2.77:1 | Fails | Lc -58.4 | Large or bold text, headings |
| Black text on #37A5DA | 7.55:1 | AAA | Lc 50.8 | Large or bold text, headings |
| #37A5DA text on white | 2.77:1 | Fails | Lc 53.2 | Large or bold text, headings |
| #37A5DA text on black | 7.55:1 | AAA | Lc -48.6 | 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
#EFF7FB
oklch(97.1% 0.01 228.9)
-
Step 100
100
#DCEDF7
oklch(93.6% 0.023 233.4)
-
Step 200
200
#BEDFF2
oklch(88.6% 0.044 233.2)
-
Step 300
300
#8ECAEB
oklch(81% 0.077 233.1)
-
Step 400
400 (this color)
#37A5DA
oklch(68.4% 0.124 234.1)
-
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)
#37A5DA 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) | #8BA4DC | 0.077 |
| Deuteranopia (no green cones) | #7594D9 | 0.065 |
| Tritanopia (no blue cones) | #00B3B7 | 0.077 |
| Achromatopsia (no color) | #9B9B9B | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37A5DA
#37A5DA
oklch(68.4% 0.124 234.1)
- #D48349
#D48349
oklch(68.4% 0.124 54.5)
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 #37A5DA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.056
- Chefchaouen Blue #4895EF ΔE 0.060
- Cornflower Blue #6495ED ΔE 0.065
- Dark Sky Blue #448EE4 ΔE 0.068
- Greyblue #77A1B5 ΔE 0.070
- Faded Blue #658CBB ΔE 0.075
- Deep Sky Blue #00BFFF ΔE 0.078
- Cadet Blue #5F9EA0 ΔE 0.085
Use #37A5DA 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.