#37D8FF
Closest named color: Aqua Blue (#02D8E9). oklch(81.9% 0.137 218.7), rgb(55, 216, 255).
Aa
Black text reads best on this color (12.42:1).
About this color
#37D8FF is a light, moderately saturated teal or cyan. In OKLCH its lightness is 82%, its chroma 0.137 and its hue 219°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Blue (#02D8E9), ΔE 0.036 away. Black text reads best on it, at 12.42:1.
| Hue family | Teals and cyans |
| Lightness | light (82%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Aqua Blue (#02D8E9) |
| Black text | 12.42:1 |
| White text | 1.68:1 |
Values
| HEX | #37D8FF |
| RGB | rgb(55, 216, 255) |
| HSL | hsl(192, 100%, 61%) |
| OKLCH | oklch(81.9% 0.137 218.7) |
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 #37D8FF | 1.68:1 | Fails | Lc -33.3 | Non-text elements, placeholder text |
| Black text on #37D8FF | 12.42:1 | AAA | Lc 74.2 | Content text, not long reading |
| #37D8FF text on white | 1.68:1 | Fails | Lc 29.6 | Dividers and decoration only |
| #37D8FF text on black | 12.42:1 | AAA | Lc -73.3 | Content text, not long reading |
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 300.
-
Step 50
50
#E9F9FE
oklch(97.2% 0.018 218.4)
-
Step 100
100
#CEF1FC
oklch(93.7% 0.039 218.7)
-
Step 200
200
#9FE6FB
oklch(88.5% 0.076 218.3)
-
Step 300
300 (this color)
#37D8FF
oklch(81.9% 0.137 218.7)
-
Step 400
400
#00B3D6
oklch(70.8% 0.128 218.5)
-
Step 500
500
#0099B8
oklch(63.1% 0.114 219)
-
Step 600
600
#00819B
oklch(55.7% 0.1 218.5)
-
Step 700
700
#006C82
oklch(49.1% 0.088 218.4)
-
Step 800
800
#00596B
oklch(42.8% 0.077 217.7)
-
Step 900
900
#004A5A
oklch(37.8% 0.068 218.5)
-
Step 950
950
#002C36
oklch(27% 0.048 217.4)
#37D8FF 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) | #BFD2FF | 0.115 |
| Deuteranopia (no green cones) | #A5BFFF | 0.103 |
| Tritanopia (no blue cones) | #00E5E4 | 0.062 |
| Achromatopsia (no color) | #C7C7C7 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37D8FF
#37D8FF
oklch(81.9% 0.137 218.7)
- #FFAC91
#FFAC91
oklch(81.9% 0.105 38.8)
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 #37D8FF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Blue #02D8E9 ΔE 0.036
- Bright Sky Blue #02CCFE ΔE 0.037
- Vivid Sky Blue #4CC9F0 ΔE 0.040
- Lightblue #7BC8F6 ΔE 0.054
- Light Sky Blue #87CEFA ΔE 0.055
- Sky Blue #87CEEB ΔE 0.056
- Sky #82CAFC ΔE 0.057
- Dark Turquoise #00CED1 ΔE 0.070
Use #37D8FF 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.