#177CB3
Closest named color: Nice Blue (#107AB0). oklch(55.9% 0.12 239.8), rgb(23, 124, 179).
Aa
White text reads best on this color (4.59:1).
About this color
#177CB3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.120 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.008 away. White text reads best on it, at 4.59:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.57:1 |
| White text | 4.59:1 |
Values
| HEX | #177CB3 |
| RGB | rgb(23, 124, 179) |
| HSL | hsl(201, 77%, 40%) |
| OKLCH | oklch(55.9% 0.12 239.8) |
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 #177CB3 | 4.59:1 | AA | Lc -76.9 | Fine for body text |
| Black text on #177CB3 | 4.57:1 | AA | Lc 32.6 | Non-text elements, placeholder text |
| #177CB3 text on white | 4.59:1 | AA | Lc 71.4 | Content text, not long reading |
| #177CB3 text on black | 4.57:1 | AA | Lc -30.2 | 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 600.
-
Step 50
50
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1ECF3
oklch(93.7% 0.015 235.4)
-
Step 200
200
#C8DCEB
oklch(88.4% 0.03 240.2)
-
Step 300
300
#A1C6E0
oklch(80.8% 0.054 239)
-
Step 400
400
#6CA8D1
oklch(70.6% 0.087 239.5)
-
Step 500
500
#4092C5
oklch(63.2% 0.11 239.3)
-
Step 600
600 (this color)
#177CB3
oklch(55.9% 0.12 239.8)
-
Step 700
700
#006799
oklch(49% 0.112 240)
-
Step 800
800
#0B557C
oklch(42.8% 0.092 239.2)
-
Step 900
900
#154664
oklch(37.7% 0.073 240)
-
Step 950
950
#0E293A
oklch(26.9% 0.046 239.3)
#177CB3 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) | #627DB5 | 0.062 |
| Deuteranopia (no green cones) | #4D6FB2 | 0.049 |
| Tritanopia (no blue cones) | #008A8F | 0.080 |
| Achromatopsia (no color) | #757575 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #177CB3
#177CB3
oklch(55.9% 0.12 239.8)
- #A7601A
#A7601A
oklch(55.9% 0.121 59.3)
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 #177CB3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.008
- Windows Blue #3778BF ΔE 0.030
- Flat Blue #3C73A8 ΔE 0.031
- Steel Blue #4682B4 ΔE 0.037
- Muted Blue #3B719F ΔE 0.040
- Blue NCS #118AB2 ΔE 0.042
- Cerulean #457B9D ΔE 0.042
- Cool Blue #4984B8 ΔE 0.044
Use #177CB3 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.