#55B9FB
Closest named color: Deep Sky Blue (#00BFFF). oklch(75.4% 0.133 240.7), rgb(85, 185, 251).
Aa
Black text reads best on this color (9.71:1).
About this color
#55B9FB is a medium-light, moderately saturated blue. In OKLCH its lightness is 75%, its chroma 0.133 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.030 away. Black text reads best on it, at 9.71:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.71:1 |
| White text | 2.16:1 |
Values
| HEX | #55B9FB |
| RGB | rgb(85, 185, 251) |
| HSL | hsl(204, 95%, 66%) |
| OKLCH | oklch(75.4% 0.133 240.7) |
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 #55B9FB | 2.16:1 | Fails | Lc -46.9 | Large or bold text, headings |
| Black text on #55B9FB | 9.71:1 | AAA | Lc 61.8 | Content text, not long reading |
| #55B9FB text on white | 2.16:1 | Fails | Lc 42.2 | Non-text elements, placeholder text |
| #55B9FB text on black | 9.71:1 | AAA | Lc -60.0 | 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
#EFF7FC
oklch(97.2% 0.011 234.8)
-
Step 100
100
#DCECF9
oklch(93.5% 0.025 242.3)
-
Step 200
200
#BFDEF5
oklch(88.5% 0.046 240.2)
-
Step 300
300
#8FC8F2
oklch(80.9% 0.084 241)
-
Step 400
400 (this color)
#55B9FB
oklch(75.4% 0.133 240.7)
-
Step 500
500
#0092D9
oklch(63.1% 0.147 241)
-
Step 600
600
#007BB7
oklch(55.7% 0.129 240.7)
-
Step 700
700
#00679A
oklch(49.1% 0.113 240.5)
-
Step 800
800
#00547F
oklch(42.6% 0.099 240.7)
-
Step 900
900
#00466B
oklch(37.7% 0.087 240.8)
-
Step 950
950
#002942
oklch(26.9% 0.063 241.6)
#55B9FB 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) | #9BB9FE | 0.069 |
| Deuteranopia (no green cones) | #84A9FA | 0.056 |
| Tritanopia (no blue cones) | #00C9D0 | 0.093 |
| Achromatopsia (no color) | #B0B0B0 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #55B9FB
#55B9FB
oklch(75.4% 0.133 240.7)
- #EC9A4F
#EC9A4F
oklch(75.5% 0.133 60.9)
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 #55B9FB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.030
- Carolina Blue #8AB8FE ΔE 0.049
- Vivid Sky Blue #4CC9F0 ΔE 0.051
- Bright Sky Blue #02CCFE ΔE 0.054
- Lightblue #7BC8F6 ΔE 0.057
- Sky #82CAFC ΔE 0.065
- Light Sky Blue #87CEFA ΔE 0.078
- Pastel Blue #A2BFFE ΔE 0.080
Use #55B9FB 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.