#37A0EF
Closest named color: Chefchaouen Blue (#4895EF). oklch(68.3% 0.15 245.7), rgb(55, 160, 239).
Aa
Black text reads best on this color (7.43:1).
About this color
#37A0EF is a medium-light, vivid blue. In OKLCH its lightness is 68%, its chroma 0.150 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.030 away. Black text reads best on it, at 7.43:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.43:1 |
| White text | 2.82:1 |
Values
| HEX | #37A0EF |
| RGB | rgb(55, 160, 239) |
| HSL | hsl(206, 85%, 58%) |
| OKLCH | oklch(68.3% 0.15 245.7) |
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 #37A0EF | 2.82:1 | Fails | Lc -59.1 | Large or bold text, headings |
| Black text on #37A0EF | 7.43:1 | AAA | Lc 50.2 | Large or bold text, headings |
| #37A0EF text on white | 2.82:1 | Fails | Lc 53.8 | Large or bold text, headings |
| #37A0EF text on black | 7.43:1 | 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
#EFF7FE
oklch(97.2% 0.013 244.3)
-
Step 100
100
#DCECFB
oklch(93.6% 0.027 246.3)
-
Step 200
200
#BEDDFA
oklch(88.4% 0.052 246.6)
-
Step 300
300
#8DC7FA
oklch(80.9% 0.094 245.8)
-
Step 400
400 (this color)
#37A0EF
oklch(68.3% 0.15 245.7)
-
Step 500
500
#008FE4
oklch(63% 0.162 246)
-
Step 600
600
#0078C0
oklch(55.5% 0.142 245.8)
-
Step 700
700
#0065A3
oklch(49.1% 0.126 245.9)
-
Step 800
800
#005386
oklch(42.8% 0.108 245.3)
-
Step 900
900
#004571
oklch(37.8% 0.096 245.5)
-
Step 950
950
#002846
oklch(26.9% 0.07 246.6)
#37A0EF 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) | #7BA3F2 | 0.061 |
| Deuteranopia (no green cones) | #6192EE | 0.045 |
| Tritanopia (no blue cones) | #00B3BC | 0.107 |
| Achromatopsia (no color) | #9A9A9A | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37A0EF
#37A0EF
oklch(68.3% 0.15 245.7)
- #D6830C
#D6830C
oklch(68.3% 0.15 65.9)
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 #37A0EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.030
- Cornflower Blue #6495ED ΔE 0.041
- Dark Sky Blue #448EE4 ΔE 0.048
- Dodger Blue #1E90FF ΔE 0.055
- Soft Blue #6488EA ΔE 0.067
- Deep Sky Blue #00BFFF ΔE 0.082
- Water Blue #0E87CC ΔE 0.085
- Faded Blue #658CBB ΔE 0.086
Use #37A0EF 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.