#177EB7
Closest named color: Nice Blue (#107AB0). oklch(56.6% 0.123 240.3), rgb(23, 126, 183).
Aa
Black text reads best on this color (4.70:1).
About this color
#177EB7 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.123 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.015 away. Black text reads best on it, at 4.70:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.70:1 |
| White text | 4.46:1 |
Values
| HEX | #177EB7 |
| RGB | rgb(23, 126, 183) |
| HSL | hsl(201, 78%, 40%) |
| OKLCH | oklch(56.6% 0.123 240.3) |
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 #177EB7 | 4.46:1 | AA large text | Lc -76.0 | Fine for body text |
| Black text on #177EB7 | 4.70:1 | AA | Lc 33.6 | Non-text elements, placeholder text |
| #177EB7 text on white | 4.46:1 | AA large text | Lc 70.5 | Content text, not long reading |
| #177EB7 text on black | 4.70:1 | AA | Lc -31.2 | 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
#E1ECF4
oklch(93.7% 0.016 239.1)
-
Step 200
200
#C8DCEC
oklch(88.4% 0.031 242)
-
Step 300
300
#A1C6E1
oklch(80.9% 0.055 240)
-
Step 400
400
#6BA8D3
oklch(70.7% 0.089 240.4)
-
Step 500
500
#3F92C7
oklch(63.2% 0.113 240.1)
-
Step 600
600 (this color)
#177EB7
oklch(56.6% 0.123 240.3)
-
Step 700
700
#00679A
oklch(49.1% 0.113 240.5)
-
Step 800
800
#08547D
oklch(42.6% 0.095 240.5)
-
Step 900
900
#144665
oklch(37.7% 0.074 240.5)
-
Step 950
950
#0E293B
oklch(27% 0.047 240.8)
#177EB7 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) | #637FBA | 0.063 |
| Deuteranopia (no green cones) | #4D71B6 | 0.048 |
| Tritanopia (no blue cones) | #008C92 | 0.081 |
| Achromatopsia (no color) | #777777 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #177EB7
#177EB7
oklch(56.6% 0.123 240.3)
- #AA6218
#AA6218
oklch(56.7% 0.124 59.9)
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 #177EB7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.015
- Windows Blue #3778BF ΔE 0.028
- Steel Blue #4682B4 ΔE 0.034
- Flat Blue #3C73A8 ΔE 0.037
- Water Blue #0E87CC ΔE 0.037
- Blue NCS #118AB2 ΔE 0.038
- Cool Blue #4984B8 ΔE 0.039
- Cerulean #457B9D ΔE 0.046
Use #177EB7 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.