#37AAEE
Closest named color: Deep Sky Blue (#00BFFF). oklch(70.5% 0.141 239.8), rgb(55, 170, 238).
Aa
Black text reads best on this color (8.14:1).
About this color
#37AAEE is a medium-light, vivid blue. In OKLCH its lightness is 70%, its chroma 0.141 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.056 away. Black text reads best on it, at 8.14:1.
| Hue family | Blues |
| Lightness | medium-light (70%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.14:1 |
| White text | 2.57:1 |
Values
| HEX | #37AAEE |
| RGB | rgb(55, 170, 238) |
| HSL | hsl(202, 84%, 57%) |
| OKLCH | oklch(70.5% 0.141 239.8) |
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 #37AAEE | 2.57:1 | Fails | Lc -55.1 | Large or bold text, headings |
| Black text on #37AAEE | 8.14:1 | AAA | Lc 54.0 | Large or bold text, headings |
| #37AAEE text on white | 2.57:1 | Fails | Lc 50.0 | Large or bold text, headings |
| #37AAEE text on black | 8.14:1 | AAA | Lc -51.9 | 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
#EFF7FD
oklch(97.2% 0.012 239.9)
-
Step 100
100
#DBEDFA
oklch(93.7% 0.026 239.1)
-
Step 200
200
#BDDEF7
oklch(88.5% 0.049 240.8)
-
Step 300
300
#8BC9F4
oklch(80.9% 0.088 239.5)
-
Step 400
400 (this color)
#37AAEE
oklch(70.5% 0.141 239.8)
-
Step 500
500
#0093D7
oklch(63.2% 0.144 239.7)
-
Step 600
600
#007BB5
oklch(55.6% 0.127 239.8)
-
Step 700
700
#006799
oklch(49% 0.112 240)
-
Step 800
800
#00557E
oklch(42.8% 0.097 239.2)
-
Step 900
900
#00466A
oklch(37.6% 0.086 240.1)
-
Step 950
950
#002A41
oklch(27.1% 0.061 239)
#37AAEE 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) | #8AABF1 | 0.074 |
| Deuteranopia (no green cones) | #719AED | 0.058 |
| Tritanopia (no blue cones) | #00BBC2 | 0.093 |
| Achromatopsia (no color) | #A1A1A1 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37AAEE
#37AAEE
oklch(70.5% 0.141 239.8)
- #DF8837
#DF8837
oklch(70.5% 0.141 59.7)
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 #37AAEE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.056
- Chefchaouen Blue #4895EF ΔE 0.057
- Cornflower Blue #6495ED ΔE 0.061
- Turquoise Blue #06B1C4 ΔE 0.074
- Dark Sky Blue #448EE4 ΔE 0.074
- Dodger Blue #1E90FF ΔE 0.082
- Carolina Blue #8AB8FE ΔE 0.088
- Vivid Sky Blue #4CC9F0 ΔE 0.089
Use #37AAEE 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.