#177BA5
Closest named color: Nice Blue (#107AB0). oklch(54.9% 0.107 232.8), rgb(23, 123, 165).
Aa
White text reads best on this color (4.75:1).
About this color
#177BA5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.107 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.018 away. White text reads best on it, at 4.75:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.41:1 |
| White text | 4.75:1 |
Values
| HEX | #177BA5 |
| RGB | rgb(23, 123, 165) |
| HSL | hsl(198, 76%, 37%) |
| OKLCH | oklch(54.9% 0.107 232.8) |
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 #177BA5 | 4.75:1 | AA | Lc -78.0 | Fine for body text |
| Black text on #177BA5 | 4.41:1 | AA large text | Lc 31.5 | Non-text elements, placeholder text |
| #177BA5 text on white | 4.75:1 | AA | Lc 72.6 | Content text, not long reading |
| #177BA5 text on black | 4.41:1 | AA large text | Lc -29.1 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C9DDE8
oklch(88.6% 0.026 231.7)
-
Step 300
300
#A3C7DB
oklch(81% 0.048 232.5)
-
Step 400
400
#6EA9C9
oklch(70.6% 0.077 233.1)
-
Step 500
500
#4393BB
oklch(63% 0.098 233.1)
-
Step 600
600 (this color)
#177BA5
oklch(54.9% 0.107 232.8)
-
Step 700
700
#07698F
oklch(49% 0.099 232.8)
-
Step 800
800
#0F5674
oklch(42.7% 0.082 232.5)
-
Step 900
900
#17475E
oklch(37.7% 0.064 233.1)
-
Step 950
950
#0F2A37
oklch(27.1% 0.041 231.9)
#177BA5 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) | #667AA7 | 0.068 |
| Deuteranopia (no green cones) | #546DA4 | 0.058 |
| Tritanopia (no blue cones) | #008689 | 0.063 |
| Achromatopsia (no color) | #737373 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #177BA5
#177BA5
oklch(54.9% 0.107 232.8)
- #A15E30
#A15E30
oklch(54.9% 0.106 53)
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 #177BA5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.018
- Sea Blue #047495 ΔE 0.031
- Flat Blue #3C73A8 ΔE 0.031
- Cerulean #457B9D ΔE 0.031
- Ocean #017B92 ΔE 0.032
- Muted Blue #3B719F ΔE 0.032
- Ocean Blue #03719C ΔE 0.032
- Dull Blue #49759C ΔE 0.036
Use #177BA5 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.