#37BCDF
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(74% 0.121 219.8), rgb(55, 188, 223).
Aa
Black text reads best on this color (9.42:1).
About this color
#37BCDF is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 74%, its chroma 0.121 and its hue 220°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.043 away. Black text reads best on it, at 9.42:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.42:1 |
| White text | 2.22:1 |
Values
| HEX | #37BCDF |
| RGB | rgb(55, 188, 223) |
| HSL | hsl(193, 72%, 55%) |
| OKLCH | oklch(74% 0.121 219.8) |
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 #37BCDF | 2.22:1 | Fails | Lc -48.3 | Large or bold text, headings |
| Black text on #37BCDF | 9.42:1 | AAA | Lc 60.5 | Content text, not long reading |
| #37BCDF text on white | 2.22:1 | Fails | Lc 43.5 | Non-text elements, placeholder text |
| #37BCDF text on black | 9.42:1 | AAA | Lc -58.7 | 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
#EEF7FA
oklch(97% 0.01 219.6)
-
Step 100
100
#DBEEF4
oklch(93.7% 0.022 218.6)
-
Step 200
200
#BCE0EC
oklch(88.5% 0.041 220)
-
Step 300
300
#88CDE2
oklch(81% 0.075 219)
-
Step 400
400 (this color)
#37BCDF
oklch(74% 0.121 219.8)
-
Step 500
500
#0099B9
oklch(63.1% 0.115 219.7)
-
Step 600
600
#00809C
oklch(55.5% 0.101 220.3)
-
Step 700
700
#006C83
oklch(49.1% 0.089 219.3)
-
Step 800
800
#00586C
oklch(42.6% 0.078 220.2)
-
Step 900
900
#004A5B
oklch(37.8% 0.069 219.8)
-
Step 950
950
#002C37
oklch(27.1% 0.049 219.4)
#37BCDF 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) | #A7B7E1 | 0.101 |
| Deuteranopia (no green cones) | #90A7DF | 0.089 |
| Tritanopia (no blue cones) | #00C7C7 | 0.056 |
| Achromatopsia (no color) | #AEAEAE | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37BCDF
#37BCDF
oklch(74% 0.121 219.8)
- #EB8F6F
#EB8F6F
oklch(73.9% 0.121 39.9)
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 #37BCDF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.043
- Deep Sky Blue #00BFFF ΔE 0.046
- Turquoise Blue #06B1C4 ΔE 0.050
- Bright Sky Blue #02CCFE ΔE 0.053
- Dark Turquoise #00CED1 ΔE 0.061
- Lightblue #7BC8F6 ΔE 0.071
- Topaz #13BBAF ΔE 0.074
- Medium Turquoise #48D1CC ΔE 0.075
Use #37BCDF 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.