#37A0DB
Closest named color: Chefchaouen Blue (#4895EF). oklch(67.2% 0.128 238), rgb(55, 160, 219).
Aa
Black text reads best on this color (7.21:1).
About this color
#37A0DB is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.128 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.048 away. Black text reads best on it, at 7.21:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.21:1 |
| White text | 2.91:1 |
Values
| HEX | #37A0DB |
| RGB | rgb(55, 160, 219) |
| HSL | hsl(202, 69%, 54%) |
| OKLCH | oklch(67.2% 0.128 238) |
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 #37A0DB | 2.91:1 | Fails | Lc -60.4 | Content text, not long reading |
| Black text on #37A0DB | 7.21:1 | AAA | Lc 48.9 | Large or bold text, headings |
| #37A0DB text on white | 2.91:1 | Fails | Lc 55.1 | Large or bold text, headings |
| #37A0DB text on black | 7.21:1 | AAA | Lc -46.7 | 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
#BFDEF4
oklch(88.5% 0.045 238.9)
-
Step 300
300
#8FC9EF
oklch(81% 0.08 237.8)
-
Step 400
400 (this color)
#37A0DB
oklch(67.2% 0.128 238)
-
Step 500
500
#0093D3
oklch(63% 0.14 238.1)
-
Step 600
600
#007CB2
oklch(55.6% 0.123 237.7)
-
Step 700
700
#006897
oklch(49.1% 0.109 238.1)
-
Step 800
800
#00557C
oklch(42.7% 0.094 237.9)
-
Step 900
900
#004768
oklch(37.7% 0.083 237.5)
-
Step 950
950
#002A40
oklch(27% 0.06 237.8)
#37A0DB 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) | #84A0DE | 0.071 |
| Deuteranopia (no green cones) | #6E90DA | 0.059 |
| Tritanopia (no blue cones) | #00AFB4 | 0.084 |
| Achromatopsia (no color) | #979797 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37A0DB
#37A0DB
oklch(67.2% 0.128 238)
- #D0803D
#D0803D
oklch(67.3% 0.128 57.8)
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 #37A0DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.048
- Dark Sky Blue #448EE4 ΔE 0.054
- Cornflower Blue #6495ED ΔE 0.056
- Faded Blue #658CBB ΔE 0.067
- Turquoise Blue #06B1C4 ΔE 0.068
- Water Blue #0E87CC ΔE 0.076
- Greyblue #77A1B5 ΔE 0.076
- Dodger Blue #1E90FF ΔE 0.077
Use #37A0DB 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.