#37A3DD
Closest named color: Chefchaouen Blue (#4895EF). oklch(68% 0.128 236.9), rgb(55, 163, 221).
Aa
Black text reads best on this color (7.44:1).
About this color
#37A3DD is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.128 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.052 away. Black text reads best on it, at 7.44:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.44:1 |
| White text | 2.82:1 |
Values
| HEX | #37A3DD |
| RGB | rgb(55, 163, 221) |
| HSL | hsl(201, 71%, 54%) |
| OKLCH | oklch(68% 0.128 236.9) |
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 #37A3DD | 2.82:1 | Fails | Lc -59.1 | Large or bold text, headings |
| Black text on #37A3DD | 7.44:1 | AAA | Lc 50.2 | Large or bold text, headings |
| #37A3DD text on white | 2.82:1 | Fails | Lc 53.8 | Large or bold text, headings |
| #37A3DD text on black | 7.44:1 | AAA | Lc -48.0 | 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
#DCEDF8
oklch(93.7% 0.023 236)
-
Step 200
200
#BEDEF3
oklch(88.4% 0.045 236.8)
-
Step 300
300
#8EC9EE
oklch(80.9% 0.08 236.6)
-
Step 400
400 (this color)
#37A3DD
oklch(68% 0.128 236.9)
-
Step 500
500
#0094D1
oklch(63.1% 0.137 236.6)
-
Step 600
600
#007CB1
oklch(55.6% 0.122 237.2)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900
#004767
oklch(37.7% 0.082 236.6)
-
Step 950
950
#002A3F
oklch(27% 0.059 236.5)
#37A3DD 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) | #87A3E0 | 0.073 |
| Deuteranopia (no green cones) | #7193DC | 0.060 |
| Tritanopia (no blue cones) | #00B2B7 | 0.083 |
| Achromatopsia (no color) | #9A9A9A | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37A3DD
#37A3DD
oklch(68% 0.128 236.9)
- #D38241
#D38241
oklch(68% 0.128 56.9)
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 #37A3DD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.052
- Cornflower Blue #6495ED ΔE 0.059
- Dark Sky Blue #448EE4 ΔE 0.061
- Turquoise Blue #06B1C4 ΔE 0.064
- Faded Blue #658CBB ΔE 0.073
- Greyblue #77A1B5 ΔE 0.075
- Deep Sky Blue #00BFFF ΔE 0.080
- Dodger Blue #1E90FF ΔE 0.081
Use #37A3DD 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.