#37A4EF
Closest named color: Chefchaouen Blue (#4895EF). oklch(69.2% 0.146 243.5), rgb(55, 164, 239).
Aa
Black text reads best on this color (7.71:1).
About this color
#37A4EF is a medium-light, vivid blue. In OKLCH its lightness is 69%, its chroma 0.146 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.040 away. Black text reads best on it, at 7.71:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.71:1 |
| White text | 2.72:1 |
Values
| HEX | #37A4EF |
| RGB | rgb(55, 164, 239) |
| HSL | hsl(204, 85%, 58%) |
| OKLCH | oklch(69.2% 0.146 243.5) |
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 #37A4EF | 2.72:1 | Fails | Lc -57.5 | Large or bold text, headings |
| Black text on #37A4EF | 7.71:1 | AAA | Lc 51.7 | Large or bold text, headings |
| #37A4EF text on white | 2.72:1 | Fails | Lc 52.3 | Large or bold text, headings |
| #37A4EF text on black | 7.71:1 | AAA | Lc -49.6 | 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
#EFF7FD
oklch(97.2% 0.012 239.9)
-
Step 100
100
#DCECFB
oklch(93.6% 0.027 246.3)
-
Step 200
200
#BDDEF9
oklch(88.5% 0.051 243)
-
Step 300
300
#8CC8F8
oklch(80.9% 0.092 243.4)
-
Step 400
400 (this color)
#37A4EF
oklch(69.2% 0.146 243.5)
-
Step 500
500
#0091DF
oklch(63.2% 0.154 243.6)
-
Step 600
600
#007ABC
oklch(55.7% 0.136 243.3)
-
Step 700
700
#00669F
oklch(49.1% 0.12 243.6)
-
Step 800
800
#005383
oklch(42.6% 0.105 243.8)
-
Step 900
900
#00456E
oklch(37.6% 0.092 243.7)
-
Step 950
950
#002944
oklch(27% 0.066 243.6)
#37A4EF 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) | #81A6F2 | 0.066 |
| Deuteranopia (no green cones) | #6795EE | 0.050 |
| Tritanopia (no blue cones) | #00B6BF | 0.101 |
| Achromatopsia (no color) | #9D9D9D | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37A4EF
#37A4EF
oklch(69.2% 0.146 243.5)
- #DA8522
#DA8522
oklch(69.2% 0.147 63.5)
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 #37A4EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.040
- Cornflower Blue #6495ED ΔE 0.048
- Dark Sky Blue #448EE4 ΔE 0.058
- Dodger Blue #1E90FF ΔE 0.065
- Deep Sky Blue #00BFFF ΔE 0.071
- Soft Blue #6488EA ΔE 0.076
- Turquoise Blue #06B1C4 ΔE 0.084
- Periwinkle Blue #8F99FB ΔE 0.089
Use #37A4EF 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.