#017BE3
Closest named color: Cerulean Blue (#056EEE). oklch(58.5% 0.182 253.3), rgb(1, 123, 227).
Aa
Black text reads best on this color (4.94:1).
About this color
#017BE3 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.182 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.038 away. Black text reads best on it, at 4.94:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.182) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.94:1 |
| White text | 4.24:1 |
Values
| HEX | #017BE3 |
| RGB | rgb(1, 123, 227) |
| HSL | hsl(208, 99%, 45%) |
| OKLCH | oklch(58.5% 0.182 253.3) |
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 #017BE3 | 4.24:1 | AA large text | Lc -74.1 | Content text, not long reading |
| Black text on #017BE3 | 4.94:1 | AA | Lc 35.5 | Non-text elements, placeholder text |
| #017BE3 text on white | 4.24:1 | AA large text | Lc 68.6 | Content text, not long reading |
| #017BE3 text on black | 4.94:1 | AA | Lc -33.1 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C5DCF7
oklch(88.6% 0.045 252.5)
-
Step 300
300
#9CC4F5
oklch(80.9% 0.082 253.8)
-
Step 400
400
#62A4F0
oklch(70.7% 0.131 253.1)
-
Step 500
500
#308BEB
oklch(63.2% 0.167 253.2)
-
Step 600
600 (this color)
#017BE3
oklch(58.5% 0.182 253.3)
-
Step 700
700
#0060B4
oklch(49.1% 0.153 253.4)
-
Step 800
800
#004E95
oklch(42.6% 0.134 253.6)
-
Step 900
900
#0A4279
oklch(37.8% 0.108 253.1)
-
Step 950
950
#092747
oklch(27% 0.069 253.1)
#017BE3 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) | #4084E7 | 0.041 |
| Deuteranopia (no green cones) | #0072E1 | 0.024 |
| Tritanopia (no blue cones) | #0094A4 | 0.133 |
| Achromatopsia (no color) | #7B7B7B | 0.182 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #017BE3
#017BE3
oklch(58.5% 0.182 253.3)
- #A76E00
#A76E00
oklch(58.4% 0.124 73.4)
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 #017BE3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.038
- Clear Blue #247AFD ΔE 0.042
- Royal Blue #4169E1 ΔE 0.049
- Water Blue #0E87CC ΔE 0.052
- Windows Blue #3778BF ΔE 0.057
- Dark Sky Blue #448EE4 ΔE 0.065
- Bright Blue #0165FC ΔE 0.068
- Dodger Blue #1E90FF ΔE 0.068
Use #017BE3 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.