#37BDFA
Closest named color: Deep Sky Blue (#00BFFF). oklch(75.4% 0.141 233.5), rgb(55, 189, 250).
Aa
Black text reads best on this color (9.82:1).
About this color
#37BDFA is a medium-light, vivid blue. In OKLCH its lightness is 75%, its chroma 0.141 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.013 away. Black text reads best on it, at 9.82:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.82:1 |
| White text | 2.13:1 |
Values
| HEX | #37BDFA |
| RGB | rgb(55, 189, 250) |
| HSL | hsl(199, 95%, 60%) |
| OKLCH | oklch(75.4% 0.141 233.5) |
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 #37BDFA | 2.13:1 | Fails | Lc -46.2 | Large or bold text, headings |
| Black text on #37BDFA | 9.82:1 | AAA | Lc 62.4 | Content text, not long reading |
| #37BDFA text on white | 2.13:1 | Fails | Lc 41.5 | Non-text elements, placeholder text |
| #37BDFA text on black | 9.82:1 | AAA | Lc -60.7 | 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 400.
-
Step 50
50
#EEF7FC
oklch(97.1% 0.012 231.7)
-
Step 100
100
#DAEDF9
oklch(93.6% 0.026 235.4)
-
Step 200
200
#BADFF5
oklch(88.4% 0.049 234.2)
-
Step 300
300
#85CBF1
oklch(81% 0.089 233.1)
-
Step 400
400 (this color)
#37BDFA
oklch(75.4% 0.141 233.5)
-
Step 500
500
#0095CC
oklch(63.1% 0.132 233.7)
-
Step 600
600
#007DAC
oklch(55.5% 0.116 233.8)
-
Step 700
700
#006991
oklch(49% 0.102 233.6)
-
Step 800
800
#005678
oklch(42.7% 0.089 233.9)
-
Step 900
900
#004864
oklch(37.8% 0.078 232.8)
-
Step 950
950
#002A3D
oklch(26.9% 0.056 233.8)
#37BDFA 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) | #9FBBFD | 0.089 |
| Deuteranopia (no green cones) | #85A9F9 | 0.075 |
| Tritanopia (no blue cones) | #00CDD2 | 0.085 |
| Achromatopsia (no color) | #B1B1B1 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37BDFA
#37BDFA
oklch(75.4% 0.141 233.5)
- #F49452
#F49452
oklch(75.4% 0.141 53.3)
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 #37BDFA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.013
- Bright Sky Blue #02CCFE ΔE 0.040
- Vivid Sky Blue #4CC9F0 ΔE 0.043
- Lightblue #7BC8F6 ΔE 0.062
- Carolina Blue #8AB8FE ΔE 0.066
- Sky #82CAFC ΔE 0.070
- Light Sky Blue #87CEFA ΔE 0.081
- Turquoise Blue #06B1C4 ΔE 0.084
Use #37BDFA 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.