#0178BE
Closest named color: Windows Blue (#3778BF). oklch(55.4% 0.14 245.2), rgb(1, 120, 190).
Aa
White text reads best on this color (4.73:1).
About this color
#0178BE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.140 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.024 away. White text reads best on it, at 4.73:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.140) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.43:1 |
| White text | 4.73:1 |
Values
| HEX | #0178BE |
| RGB | rgb(1, 120, 190) |
| HSL | hsl(202, 99%, 37%) |
| OKLCH | oklch(55.4% 0.14 245.2) |
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 #0178BE | 4.73:1 | AA | Lc -77.7 | Fine for body text |
| Black text on #0178BE | 4.43:1 | AA large text | Lc 31.8 | Non-text elements, placeholder text |
| #0178BE text on white | 4.73:1 | AA | Lc 72.2 | Content text, not long reading |
| #0178BE text on black | 4.43:1 | AA large text | Lc -29.4 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0EBF6
oklch(93.5% 0.019 248)
-
Step 200
200
#C7DCEF
oklch(88.5% 0.035 245.5)
-
Step 300
300
#9FC6E7
oklch(81% 0.063 244.2)
-
Step 400
400
#69A7DB
oklch(70.7% 0.1 245.2)
-
Step 500
500
#3A90D2
oklch(63.2% 0.129 245.2)
-
Step 600
600 (this color)
#0178BE
oklch(55.4% 0.14 245.2)
-
Step 700
700
#0065A2
oklch(49% 0.125 245.5)
-
Step 800
800
#015385
oklch(42.7% 0.107 244.9)
-
Step 900
900
#11456B
oklch(37.7% 0.084 245.3)
-
Step 950
950
#0C293F
oklch(27.1% 0.054 244.7)
#0178BE 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) | #567BC1 | 0.056 |
| Deuteranopia (no green cones) | #3B6CBD | 0.039 |
| Tritanopia (no blue cones) | #008992 | 0.096 |
| Achromatopsia (no color) | #737373 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0178BE
#0178BE
oklch(55.4% 0.14 245.2)
- #A36100
#A36100
oklch(55.4% 0.124 65.4)
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 #0178BE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.024
- Nice Blue #107AB0 ΔE 0.024
- Mid Blue #276AB3 ΔE 0.039
- Flat Blue #3C73A8 ΔE 0.040
- Water Blue #0E87CC ΔE 0.045
- French Blue #436BAD ΔE 0.048
- Muted Blue #3B719F ΔE 0.052
- Steel Blue #4682B4 ΔE 0.053
Use #0178BE 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.