#177FA9
Closest named color: Nice Blue (#107AB0). oklch(56.1% 0.108 231.9), rgb(23, 127, 169).
Aa
Black text reads best on this color (4.64:1).
About this color
#177FA9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.108 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.021 away. Black text reads best on it, at 4.64:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.64:1 |
| White text | 4.52:1 |
Values
| HEX | #177FA9 |
| RGB | rgb(23, 127, 169) |
| HSL | hsl(197, 76%, 38%) |
| OKLCH | oklch(56.1% 0.108 231.9) |
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 #177FA9 | 4.52:1 | AA | Lc -76.4 | Fine for body text |
| Black text on #177FA9 | 4.64:1 | AA | Lc 33.1 | Non-text elements, placeholder text |
| #177FA9 text on white | 4.52:1 | AA | Lc 70.9 | Content text, not long reading |
| #177FA9 text on black | 4.64:1 | AA | Lc -30.7 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C8DDE8
oklch(88.5% 0.027 230.4)
-
Step 300
300
#A2C7DB
oklch(80.9% 0.049 231.7)
-
Step 400
400
#6DAAC9
oklch(70.8% 0.078 231.5)
-
Step 500
500
#4094BB
oklch(63.1% 0.099 231.5)
-
Step 600
600 (this color)
#177FA9
oklch(56.1% 0.108 231.9)
-
Step 700
700
#006A8F
oklch(49.2% 0.1 231.3)
-
Step 800
800
#0A5674
oklch(42.6% 0.083 231.8)
-
Step 900
900
#15475E
oklch(37.6% 0.065 232.4)
-
Step 950
950
#0E2A37
oklch(27% 0.041 231.2)
#177FA9 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) | #6A7EAB | 0.071 |
| Deuteranopia (no green cones) | #5771A8 | 0.059 |
| Tritanopia (no blue cones) | #008A8D | 0.063 |
| Achromatopsia (no color) | #767676 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #177FA9
#177FA9
oklch(56.1% 0.108 231.9)
- #A66133
#A66133
oklch(56.2% 0.108 52.4)
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 #177FA9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.021
- Cerulean #457B9D ΔE 0.032
- Blue NCS #118AB2 ΔE 0.032
- Teal Blue #01889F ΔE 0.035
- Steel Blue #4682B4 ΔE 0.038
- Ocean #017B92 ΔE 0.038
- Flat Blue #3C73A8 ΔE 0.038
- Dull Blue #49759C ΔE 0.041
Use #177FA9 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.