#55B3FF
Closest named color: Deep Sky Blue (#00BFFF). oklch(74.2% 0.142 245.8), rgb(85, 179, 255).
Aa
Black text reads best on this color (9.27:1).
About this color
#55B3FF is a medium-light, vivid blue. In OKLCH its lightness is 74%, its chroma 0.142 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.040 away. Black text reads best on it, at 9.27:1.
| Hue family | Blues |
| Lightness | medium-light (74%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.27:1 |
| White text | 2.26:1 |
Values
| HEX | #55B3FF |
| RGB | rgb(85, 179, 255) |
| HSL | hsl(207, 100%, 67%) |
| OKLCH | oklch(74.2% 0.142 245.8) |
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 #55B3FF | 2.26:1 | Fails | Lc -49.1 | Large or bold text, headings |
| Black text on #55B3FF | 9.27:1 | AAA | Lc 59.6 | Large or bold text, headings |
| #55B3FF text on white | 2.26:1 | Fails | Lc 44.3 | Non-text elements, placeholder text |
| #55B3FF text on black | 9.27:1 | AAA | Lc -57.8 | 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
#91C7F7
oklch(81% 0.088 246)
-
Step 400
400 (this color)
#55B3FF
oklch(74.2% 0.142 245.8)
-
Step 500
500
#008FE4
oklch(63% 0.162 246)
-
Step 600
600
#0078C0
oklch(55.5% 0.142 245.8)
-
Step 700
700
#0065A3
oklch(49.1% 0.126 245.9)
-
Step 800
800
#005386
oklch(42.8% 0.108 245.3)
-
Step 900
900
#004571
oklch(37.8% 0.096 245.5)
-
Step 950
950
#002846
oklch(26.9% 0.07 246.6)
#55B3FF 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) | #91B5FF | 0.059 |
| Deuteranopia (no green cones) | #7AA5FE | 0.046 |
| Tritanopia (no blue cones) | #00C5CE | 0.104 |
| Achromatopsia (no color) | #ACACAC | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #55B3FF
#55B3FF
oklch(74.2% 0.142 245.8)
- #E7973B
#E7973B
oklch(74.2% 0.141 65.7)
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 #55B3FF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.040
- Carolina Blue #8AB8FE ΔE 0.054
- Vivid Sky Blue #4CC9F0 ΔE 0.069
- Bright Sky Blue #02CCFE ΔE 0.070
- Lightblue #7BC8F6 ΔE 0.074
- Cornflower Blue #6495ED ΔE 0.078
- Sky #82CAFC ΔE 0.080
- Periwinkle Blue #8F99FB ΔE 0.082
Use #55B3FF 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.