#55B4EA
Closest named color: Deep Sky Blue (#00BFFF). oklch(73.5% 0.119 236.5), rgb(85, 180, 234).
Aa
Black text reads best on this color (9.10:1).
About this color
#55B4EA is a medium-light, moderately saturated blue. In OKLCH its lightness is 73%, its chroma 0.119 and its hue 236°. 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 9.10:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.10:1 |
| White text | 2.30:1 |
Values
| HEX | #55B4EA |
| RGB | rgb(85, 180, 234) |
| HSL | hsl(202, 78%, 63%) |
| OKLCH | oklch(73.5% 0.119 236.5) |
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 #55B4EA | 2.30:1 | Fails | Lc -50.1 | Large or bold text, headings |
| Black text on #55B4EA | 9.10:1 | AAA | Lc 58.7 | Large or bold text, headings |
| #55B4EA text on white | 2.30:1 | Fails | Lc 45.2 | Large or bold text, headings |
| #55B4EA text on black | 9.10:1 | AAA | Lc -56.9 | 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
#EFF7FB
oklch(97.1% 0.01 228.9)
-
Step 100
100
#DDECF7
oklch(93.5% 0.022 239.4)
-
Step 200
200
#C0DEF1
oklch(88.5% 0.041 235.7)
-
Step 300
300
#92C9EB
oklch(81% 0.075 236.1)
-
Step 400
400 (this color)
#55B4EA
oklch(73.5% 0.119 236.5)
-
Step 500
500
#0094D1
oklch(63.1% 0.137 236.6)
-
Step 600
600
#007CB0
oklch(55.5% 0.121 236.7)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900
#004767
oklch(37.7% 0.082 236.6)
-
Step 950
950
#002A3F
oklch(27% 0.059 236.5)
#55B4EA 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) | #9BB3ED | 0.071 |
| Deuteranopia (no green cones) | #86A4E9 | 0.059 |
| Tritanopia (no blue cones) | #00C2C6 | 0.082 |
| Achromatopsia (no color) | #ABABAB | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #55B4EA
#55B4EA
oklch(73.5% 0.119 236.5)
- #E2955B
#E2955B
oklch(73.6% 0.119 56.6)
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 #55B4EA, 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
- Vivid Sky Blue #4CC9F0 ΔE 0.056
- Carolina Blue #8AB8FE ΔE 0.062
- Bright Sky Blue #02CCFE ΔE 0.065
- Lightblue #7BC8F6 ΔE 0.068
- Turquoise Blue #06B1C4 ΔE 0.069
- Sky #82CAFC ΔE 0.078
- Greyblue #77A1B5 ΔE 0.082
Use #55B4EA 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.