#55B5FF
Closest named color: Deep Sky Blue (#00BFFF). oklch(74.7% 0.14 244.6), rgb(85, 181, 255).
Aa
Black text reads best on this color (9.43:1).
About this color
#55B5FF is a medium-light, vivid blue. In OKLCH its lightness is 75%, its chroma 0.140 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.037 away. Black text reads best on it, at 9.43:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | vivid (0.140) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.43:1 |
| White text | 2.22:1 |
Values
| HEX | #55B5FF |
| RGB | rgb(85, 181, 255) |
| HSL | hsl(206, 100%, 67%) |
| OKLCH | oklch(74.7% 0.14 244.6) |
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 #55B5FF | 2.22:1 | Fails | Lc -48.3 | Large or bold text, headings |
| Black text on #55B5FF | 9.43:1 | AAA | Lc 60.4 | Content text, not long reading |
| #55B5FF text on white | 2.22:1 | Fails | Lc 43.5 | Non-text elements, placeholder text |
| #55B5FF text on black | 9.43:1 | AAA | Lc -58.6 | 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
#EFF6FD
oklch(97% 0.012 248)
-
Step 100
100
#DCECFA
oklch(93.5% 0.026 244.4)
-
Step 200
200
#BFDDF8
oklch(88.4% 0.049 245.6)
-
Step 300
300
#90C7F6
oklch(80.9% 0.088 245)
-
Step 400
400 (this color)
#55B5FF
oklch(74.7% 0.14 244.6)
-
Step 500
500
#0090E1
oklch(63.1% 0.158 244.7)
-
Step 600
600
#0079BE
oklch(55.6% 0.139 244.6)
-
Step 700
700
#0066A1
oklch(49.2% 0.123 244.5)
-
Step 800
800
#005385
oklch(42.7% 0.107 244.8)
-
Step 900
900
#004570
oklch(37.7% 0.095 244.9)
-
Step 950
950
#002945
oklch(27.1% 0.068 244.5)
#55B5FF 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) | #94B7FF | 0.062 |
| Deuteranopia (no green cones) | #7CA6FE | 0.049 |
| Tritanopia (no blue cones) | #00C7CF | 0.103 |
| Achromatopsia (no color) | #AEAEAE | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #55B5FF
#55B5FF
oklch(74.7% 0.14 244.6)
- #E99840
#E99840
oklch(74.6% 0.14 64.5)
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 #55B5FF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.037
- Carolina Blue #8AB8FE ΔE 0.051
- Vivid Sky Blue #4CC9F0 ΔE 0.064
- Bright Sky Blue #02CCFE ΔE 0.065
- Lightblue #7BC8F6 ΔE 0.069
- Sky #82CAFC ΔE 0.075
- Cornflower Blue #6495ED ΔE 0.083
- Pastel Blue #A2BFFE ΔE 0.085
Use #55B5FF 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.