#37AFFB
Closest named color: Deep Sky Blue (#00BFFF). oklch(72.3% 0.151 241.8), rgb(55, 175, 251).
Aa
Black text reads best on this color (8.68:1).
About this color
#37AFFB is a medium-light, vivid blue. In OKLCH its lightness is 72%, its chroma 0.151 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.042 away. Black text reads best on it, at 8.68:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | vivid (0.151) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.68:1 |
| White text | 2.41:1 |
Values
| HEX | #37AFFB |
| RGB | rgb(55, 175, 251) |
| HSL | hsl(203, 96%, 60%) |
| OKLCH | oklch(72.3% 0.151 241.8) |
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 #37AFFB | 2.41:1 | Fails | Lc -52.1 | Large or bold text, headings |
| Black text on #37AFFB | 8.68:1 | AAA | Lc 56.8 | Large or bold text, headings |
| #37AFFB text on white | 2.41:1 | Fails | Lc 47.2 | Large or bold text, headings |
| #37AFFB text on black | 8.68:1 | AAA | Lc -54.9 | 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
#EEF7FD
oklch(97.1% 0.013 236.6)
-
Step 100
100
#DBEDFB
oklch(93.7% 0.027 241.2)
-
Step 200
200
#BCDEF9
oklch(88.5% 0.052 242.2)
-
Step 300
300
#89C9F9
oklch(81% 0.094 241.8)
-
Step 400
400 (this color)
#37AFFB
oklch(72.3% 0.151 241.8)
-
Step 500
500
#0092DB
oklch(63.2% 0.149 241.7)
-
Step 600
600
#007AB9
oklch(55.5% 0.132 242.1)
-
Step 700
700
#00679C
oklch(49.2% 0.116 241.5)
-
Step 800
800
#005481
oklch(42.7% 0.101 241.9)
-
Step 900
900
#00466C
oklch(37.7% 0.089 241.5)
-
Step 950
950
#002943
oklch(27% 0.065 242.6)
#37AFFB 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) | #8BB1FE | 0.073 |
| Deuteranopia (no green cones) | #709FFA | 0.055 |
| Tritanopia (no blue cones) | #00C2CA | 0.103 |
| Achromatopsia (no color) | #A7A7A7 | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37AFFB
#37AFFB
oklch(72.3% 0.151 241.8)
- #E88D2C
#E88D2C
oklch(72.4% 0.151 61.9)
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 #37AFFB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.042
- Chefchaouen Blue #4895EF ΔE 0.068
- Cornflower Blue #6495ED ΔE 0.070
- Carolina Blue #8AB8FE ΔE 0.077
- Bright Sky Blue #02CCFE ΔE 0.078
- Vivid Sky Blue #4CC9F0 ΔE 0.081
- Turquoise Blue #06B1C4 ΔE 0.088
- Dodger Blue #1E90FF ΔE 0.088
Use #37AFFB 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.