#37AAFF
Closest named color: Chefchaouen Blue (#4895EF). oklch(71.4% 0.159 245.6), rgb(55, 170, 255).
Aa
Black text reads best on this color (8.35:1).
About this color
#37AAFF is a medium-light, vivid blue. In OKLCH its lightness is 71%, its chroma 0.159 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.056 away. Black text reads best on it, at 8.35:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 8.35:1 |
| White text | 2.51:1 |
Values
| HEX | #37AAFF |
| RGB | rgb(55, 170, 255) |
| HSL | hsl(206, 100%, 61%) |
| OKLCH | oklch(71.4% 0.159 245.6) |
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 #37AAFF | 2.51:1 | Fails | Lc -53.9 | Large or bold text, headings |
| Black text on #37AAFF | 8.35:1 | AAA | Lc 55.1 | Large or bold text, headings |
| #37AAFF text on white | 2.51:1 | Fails | Lc 48.9 | Large or bold text, headings |
| #37AAFF text on black | 8.35:1 | AAA | Lc -53.1 | 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
#EEF7FE
oklch(97.1% 0.013 241)
-
Step 100
100
#DBECFC
oklch(93.5% 0.028 246.5)
-
Step 200
200
#BCDEFC
oklch(88.6% 0.055 245.1)
-
Step 300
300
#89C7FD
oklch(80.8% 0.1 245.7)
-
Step 400
400 (this color)
#37AAFF
oklch(71.4% 0.159 245.6)
-
Step 500
500
#0090E3
oklch(63.2% 0.16 245.3)
-
Step 600
600
#0078C0
oklch(55.5% 0.142 245.8)
-
Step 700
700
#0065A2
oklch(49% 0.125 245.5)
-
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
#002945
oklch(27.1% 0.068 244.5)
#37AAFF 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) | #82ADFF | 0.064 |
| Deuteranopia (no green cones) | #669BFD | 0.047 |
| Tritanopia (no blue cones) | #00BFC9 | 0.113 |
| Achromatopsia (no color) | #A3A3A3 | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37AAFF
#37AAFF
oklch(71.4% 0.159 245.6)
- #E58A00
#E58A00
oklch(71.4% 0.16 65.2)
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 #37AAFF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.056
- Deep Sky Blue #00BFFF ΔE 0.057
- Cornflower Blue #6495ED ΔE 0.060
- Dodger Blue #1E90FF ΔE 0.073
- Dark Sky Blue #448EE4 ΔE 0.077
- Carolina Blue #8AB8FE ΔE 0.085
- Periwinkle Blue #8F99FB ΔE 0.085
- Soft Blue #6488EA ΔE 0.089
Use #37AAFF 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.