#017FB4
Closest named color: Nice Blue (#107AB0). oklch(56.5% 0.122 236.7), rgb(1, 127, 180).
Aa
Black text reads best on this color (4.69:1).
About this color
#017FB4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.122 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.014 away. Black text reads best on it, at 4.69:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.69:1 |
| White text | 4.47:1 |
Values
| HEX | #017FB4 |
| RGB | rgb(1, 127, 180) |
| HSL | hsl(198, 99%, 35%) |
| OKLCH | oklch(56.5% 0.122 236.7) |
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 #017FB4 | 4.47:1 | AA large text | Lc -75.9 | Fine for body text |
| Black text on #017FB4 | 4.69:1 | AA | Lc 33.7 | Non-text elements, placeholder text |
| #017FB4 text on white | 4.47:1 | AA large text | Lc 70.4 | Content text, not long reading |
| #017FB4 text on black | 4.69:1 | AA | Lc -31.3 | 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
#E0ECF3
oklch(93.6% 0.016 233)
-
Step 200
200
#C7DDEB
oklch(88.6% 0.03 235.7)
-
Step 300
300
#9FC7E0
oklch(80.9% 0.055 235.8)
-
Step 400
400
#68A9D1
oklch(70.7% 0.089 236.9)
-
Step 500
500
#3893C5
oklch(63.1% 0.113 236.8)
-
Step 600
600 (this color)
#017FB4
oklch(56.5% 0.122 236.7)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900
#0F4763
oklch(37.7% 0.073 235.9)
-
Step 950
950
#0C2A3A
oklch(27.1% 0.046 235.5)
#017FB4 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) | #657FB6 | 0.069 |
| Deuteranopia (no green cones) | #4F71B3 | 0.055 |
| Tritanopia (no blue cones) | #008D92 | 0.077 |
| Achromatopsia (no color) | #777777 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #017FB4
#017FB4
oklch(56.5% 0.122 236.7)
- #AB601F
#AB601F
oklch(56.5% 0.123 56.5)
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 #017FB4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.014
- Blue NCS #118AB2 ΔE 0.034
- Windows Blue #3778BF ΔE 0.036
- Steel Blue #4682B4 ΔE 0.037
- Flat Blue #3C73A8 ΔE 0.039
- Water Blue #0E87CC ΔE 0.041
- Cool Blue #4984B8 ΔE 0.043
- Cerulean #457B9D ΔE 0.045
Use #017FB4 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.