#37A4FA
Closest named color: Chefchaouen Blue (#4895EF). oklch(69.8% 0.159 247), rgb(55, 164, 250).
Aa
Black text reads best on this color (7.85:1).
About this color
#37A4FA is a medium-light, vivid blue. In OKLCH its lightness is 70%, its chroma 0.159 and its hue 247°. 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 7.85:1.
| Hue family | Blues |
| Lightness | medium-light (70%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.85:1 |
| White text | 2.67:1 |
Values
| HEX | #37A4FA |
| RGB | rgb(55, 164, 250) |
| HSL | hsl(206, 95%, 60%) |
| OKLCH | oklch(69.8% 0.159 247) |
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 #37A4FA | 2.67:1 | Fails | Lc -56.7 | Large or bold text, headings |
| Black text on #37A4FA | 7.85:1 | AAA | Lc 52.5 | Large or bold text, headings |
| #37A4FA text on white | 2.67:1 | Fails | Lc 51.5 | Large or bold text, headings |
| #37A4FA text on black | 7.85:1 | AAA | Lc -50.4 | 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
#DBECFD
oklch(93.6% 0.029 248.1)
-
Step 200
200
#BDDDFC
oklch(88.4% 0.055 247.6)
-
Step 300
300
#8BC7FE
oklch(80.9% 0.1 247)
-
Step 400
400 (this color)
#37A4FA
oklch(69.8% 0.159 247)
-
Step 500
500
#008FE7
oklch(63.2% 0.166 246.8)
-
Step 600
600
#0078C3
oklch(55.7% 0.146 246.8)
-
Step 700
700
#0064A5
oklch(49% 0.13 247.2)
-
Step 800
800
#005288
oklch(42.7% 0.112 246.9)
-
Step 900
900
#004473
oklch(37.7% 0.1 247.4)
-
Step 950
950
#002847
oklch(27% 0.072 247.4)
#37A4FA 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) | #7CA8FE | 0.061 |
| Deuteranopia (no green cones) | #5F96F8 | 0.043 |
| Tritanopia (no blue cones) | #00B9C3 | 0.115 |
| Achromatopsia (no color) | #9E9E9E | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37A4FA
#37A4FA
oklch(69.8% 0.159 247)
- #DC8700
#DC8700
oklch(69.7% 0.154 66.7)
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 #37A4FA, 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 0.047
- Dodger Blue #1E90FF ΔE 0.059
- Dark Sky Blue #448EE4 ΔE 0.061
- Deep Sky Blue #00BFFF ΔE 0.071
- Soft Blue #6488EA ΔE 0.075
- Periwinkle Blue #8F99FB ΔE 0.084
- Carolina Blue #8AB8FE ΔE 0.096
Use #37A4FA 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.