#478AB9
Closest named color: Cool Blue (#4984B8). oklch(61% 0.099 241.5), rgb(71, 138, 185).
Aa
Black text reads best on this color (5.60:1).
About this color
#478AB9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.099 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.017 away. Black text reads best on it, at 5.60:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.60:1 |
| White text | 3.74:1 |
Values
| HEX | #478AB9 |
| RGB | rgb(71, 138, 185) |
| HSL | hsl(205, 45%, 50%) |
| OKLCH | oklch(61% 0.099 241.5) |
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 #478AB9 | 3.74:1 | AA large text | Lc -70.3 | Content text, not long reading |
| Black text on #478AB9 | 5.60:1 | AA | Lc 39.2 | Non-text elements, placeholder text |
| #478AB9 text on white | 3.74:1 | AA large text | Lc 64.8 | Content text, not long reading |
| #478AB9 text on black | 5.60:1 | AA | Lc -36.8 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEA
oklch(88.5% 0.027 241.2)
-
Step 300
300
#A6C5DE
oklch(80.9% 0.049 242.6)
-
Step 400
400
#74A7CD
oklch(70.7% 0.078 241.4)
-
Step 500
500 (this color)
#478AB9
oklch(61% 0.099 241.5)
-
Step 600
600
#2E7AAC
oklch(55.6% 0.107 241.5)
-
Step 700
700
#1F6794
oklch(49.2% 0.1 241.1)
-
Step 800
800
#1D5478
oklch(42.8% 0.082 241.4)
-
Step 900
900
#1E4561
oklch(37.6% 0.065 242.5)
-
Step 950
950
#132939
oklch(27.1% 0.041 242)
#478AB9 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) | #758ABB | 0.051 |
| Deuteranopia (no green cones) | #657FB8 | 0.041 |
| Tritanopia (no blue cones) | #00969A | 0.075 |
| Achromatopsia (no color) | #848484 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #478AB9
#478AB9
oklch(61% 0.099 241.5)
- #AE7541
#AE7541
oklch(61.1% 0.099 61.6)
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 #478AB9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.017
- Off Blue #5684AE ΔE 0.023
- Steel Blue #4682B4 ΔE 0.023
- Dusty Blue #5A86AD ΔE 0.024
- Faded Blue #658CBB ΔE 0.032
- Blue NCS #118AB2 ΔE 0.033
- Water Blue #0E87CC ΔE 0.043
- Stormy Blue #507B9C ΔE 0.053
Use #478AB9 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.