#177DAA
Closest named color: Nice Blue (#107AB0). oklch(55.7% 0.11 234.2), rgb(23, 125, 170).
Aa
White text reads best on this color (4.61:1).
About this color
#177DAA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.110 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.015 away. White text reads best on it, at 4.61:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.55:1 |
| White text | 4.61:1 |
Values
| HEX | #177DAA |
| RGB | rgb(23, 125, 170) |
| HSL | hsl(198, 76%, 38%) |
| OKLCH | oklch(55.7% 0.11 234.2) |
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 #177DAA | 4.61:1 | AA | Lc -77.1 | Fine for body text |
| Black text on #177DAA | 4.55:1 | AA | Lc 32.5 | Non-text elements, placeholder text |
| #177DAA text on white | 4.61:1 | AA | Lc 71.6 | Content text, not long reading |
| #177DAA text on black | 4.55:1 | AA | Lc -30.1 | 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
#C8DDE9
oklch(88.6% 0.028 232.7)
-
Step 300
300
#A2C7DC
oklch(81% 0.049 233.1)
-
Step 400
400
#6DA9CB
oklch(70.7% 0.08 234.4)
-
Step 500
500
#4193BD
oklch(63% 0.101 233.9)
-
Step 600
600 (this color)
#177DAA
oklch(55.7% 0.11 234.2)
-
Step 700
700
#016992
oklch(49.1% 0.103 234.3)
-
Step 800
800
#0C5676
oklch(42.8% 0.084 233.8)
-
Step 900
900
#16475F
oklch(37.7% 0.066 233.8)
-
Step 950
950
#0F2A38
oklch(27.1% 0.042 233.9)
#177DAA 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) | #677CAC | 0.068 |
| Deuteranopia (no green cones) | #546FA9 | 0.057 |
| Tritanopia (no blue cones) | #00898C | 0.068 |
| Achromatopsia (no color) | #757575 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #177DAA
#177DAA
oklch(55.7% 0.11 234.2)
- #A5602E
#A5602E
oklch(55.8% 0.11 54)
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 #177DAA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.015
- Flat Blue #3C73A8 ΔE 0.033
- Cerulean #457B9D ΔE 0.033
- Muted Blue #3B719F ΔE 0.037
- Blue NCS #118AB2 ΔE 0.037
- Dull Blue #49759C ΔE 0.039
- Ocean #017B92 ΔE 0.039
- Steel Blue #4682B4 ΔE 0.039
Use #177DAA 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.