#177BCE
Closest named color: Windows Blue (#3778BF). oklch(57.3% 0.153 250.1), rgb(23, 123, 206).
Aa
Black text reads best on this color (4.76:1).
About this color
#177BCE is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.153 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.027 away. Black text reads best on it, at 4.76:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.76:1 |
| White text | 4.41:1 |
Values
| HEX | #177BCE |
| RGB | rgb(23, 123, 206) |
| HSL | hsl(207, 80%, 45%) |
| OKLCH | oklch(57.3% 0.153 250.1) |
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 #177BCE | 4.41:1 | AA large text | Lc -75.5 | Fine for body text |
| Black text on #177BCE | 4.76:1 | AA | Lc 34.1 | Non-text elements, placeholder text |
| #177BCE text on white | 4.41:1 | AA large text | Lc 70.0 | Content text, not long reading |
| #177BCE text on black | 4.76:1 | AA | Lc -31.6 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C7DCF2
oklch(88.6% 0.038 249.5)
-
Step 300
300
#9FC5EC
oklch(80.9% 0.069 249.4)
-
Step 400
400
#69A5E3
oklch(70.6% 0.111 250.4)
-
Step 500
500
#3C8DDB
oklch(63% 0.142 250.4)
-
Step 600
600 (this color)
#177BCE
oklch(57.3% 0.153 250.1)
-
Step 700
700
#0063AB
oklch(49.2% 0.138 249.7)
-
Step 800
800
#05518C
oklch(42.7% 0.117 249.8)
-
Step 900
900
#124370
oklch(37.6% 0.093 250.4)
-
Step 950
950
#0D2842
oklch(27.1% 0.059 250.2)
#177BCE 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) | #5281D1 | 0.048 |
| Deuteranopia (no green cones) | #3371CC | 0.028 |
| Tritanopia (no blue cones) | #008F9A | 0.112 |
| Achromatopsia (no color) | #787878 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #177BCE
#177BCE
oklch(57.3% 0.153 250.1)
- #A66900
#A66900
oklch(57.3% 0.124 70.1)
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 #177BCE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.027
- Water Blue #0E87CC ΔE 0.034
- Nice Blue #107AB0 ΔE 0.047
- Steel Blue #4682B4 ΔE 0.057
- Mid Blue #276AB3 ΔE 0.057
- Cool Blue #4984B8 ΔE 0.057
- Flat Blue #3C73A8 ΔE 0.060
- Royal Blue #4169E1 ΔE 0.061
Use #177BCE 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.