#0178A4
Closest named color: Nice Blue (#107AB0). oklch(53.9% 0.111 233), rgb(1, 120, 164).
Aa
White text reads best on this color (4.97:1).
About this color
#0178A4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.111 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.020 away. White text reads best on it, at 4.97:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.22:1 |
| White text | 4.97:1 |
Values
| HEX | #0178A4 |
| RGB | rgb(1, 120, 164) |
| HSL | hsl(196, 99%, 32%) |
| OKLCH | oklch(53.9% 0.111 233) |
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 #0178A4 | 4.97:1 | AA | Lc -79.2 | Fine for body text |
| Black text on #0178A4 | 4.22:1 | AA large text | Lc 30.3 | Non-text elements, placeholder text |
| #0178A4 text on white | 4.97:1 | AA | Lc 73.8 | Content text, not long reading |
| #0178A4 text on black | 4.22:1 | AA large text | Lc -27.9 | Dividers and decoration only |
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 600.
-
Step 50
50
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C8DDE9
oklch(88.6% 0.028 232.7)
-
Step 300
300
#A1C7DC
oklch(80.9% 0.05 232.4)
-
Step 400
400
#6CA9CB
oklch(70.6% 0.08 234)
-
Step 500
500
#3F94BD
oklch(63.2% 0.102 232.6)
-
Step 600
600 (this color)
#0178A4
oklch(53.9% 0.111 233)
-
Step 700
700
#006991
oklch(49% 0.102 233.6)
-
Step 800
800
#075676
oklch(42.7% 0.086 233.1)
-
Step 900
900
#14475F
oklch(37.6% 0.067 233.2)
-
Step 950
950
#0E2A38
oklch(27.1% 0.042 233.2)
#0178A4 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) | #6277A6 | 0.070 |
| Deuteranopia (no green cones) | #4E6AA3 | 0.057 |
| Tritanopia (no blue cones) | #008487 | 0.067 |
| Achromatopsia (no color) | #707070 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0178A4
#0178A4
oklch(53.9% 0.111 233)
- #A05A28
#A05A28
oklch(54% 0.112 53.2)
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 #0178A4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.020
- Ocean Blue #03719C ΔE 0.022
- Sea Blue #047495 ΔE 0.024
- Muted Blue #3B719F ΔE 0.031
- Flat Blue #3C73A8 ΔE 0.032
- Ocean #017B92 ΔE 0.033
- Cerulean #457B9D ΔE 0.040
- Dull Blue #49759C ΔE 0.040
Use #0178A4 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.