#017FCE
Closest named color: Water Blue (#0E87CC). oklch(58% 0.152 246.9), rgb(1, 127, 206).
Aa
Black text reads best on this color (4.92:1).
About this color
#017FCE is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.152 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.024 away. Black text reads best on it, at 4.92:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.152) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 4.92:1 |
| White text | 4.26:1 |
Values
| HEX | #017FCE |
| RGB | rgb(1, 127, 206) |
| HSL | hsl(203, 99%, 41%) |
| OKLCH | oklch(58% 0.152 246.9) |
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 #017FCE | 4.26:1 | AA large text | Lc -74.2 | Content text, not long reading |
| Black text on #017FCE | 4.92:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #017FCE text on white | 4.26:1 | AA large text | Lc 68.7 | Content text, not long reading |
| #017FCE text on black | 4.92:1 | AA | Lc -32.9 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C6DCF1
oklch(88.5% 0.037 247)
-
Step 300
300
#9DC5EB
oklch(80.8% 0.069 247.4)
-
Step 400
400
#65A7E1
oklch(70.8% 0.109 246.6)
-
Step 500
500
#338FD9
oklch(63.1% 0.14 247)
-
Step 600
600 (this color)
#017FCE
oklch(58% 0.152 246.9)
-
Step 700
700
#0064A5
oklch(49% 0.13 247.2)
-
Step 800
800
#005288
oklch(42.7% 0.112 246.9)
-
Step 900
900
#0C446F
oklch(37.6% 0.092 247.5)
-
Step 950
950
#0A2841
oklch(26.9% 0.058 247.4)
#017FCE 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) | #5883D1 | 0.055 |
| Deuteranopia (no green cones) | #3A73CC | 0.036 |
| Tritanopia (no blue cones) | #00929C | 0.107 |
| Achromatopsia (no color) | #7B7B7B | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #017FCE
#017FCE
oklch(58% 0.152 246.9)
- #AC6900
#AC6900
oklch(58.1% 0.128 67.1)
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 #017FCE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.024
- Windows Blue #3778BF ΔE 0.031
- Nice Blue #107AB0 ΔE 0.046
- Steel Blue #4682B4 ΔE 0.053
- Cool Blue #4984B8 ΔE 0.053
- Blue NCS #118AB2 ΔE 0.060
- Flat Blue #3C73A8 ΔE 0.063
- Dark Sky Blue #448EE4 ΔE 0.063
Use #017FCE 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.