#178FF4
Closest named color: Dodger Blue (#1E90FF). oklch(64.2% 0.179 251), rgb(23, 143, 244).
Aa
Black text reads best on this color (6.27:1).
About this color
#178FF4 is a medium-light, vivid blue. In OKLCH its lightness is 64%, its chroma 0.179 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Dodger Blue (#1E90FF), ΔE 0.017 away. Black text reads best on it, at 6.27:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.179) |
| Temperature | cool |
| Nearest name | Dodger Blue (#1E90FF) |
| Black text | 6.27:1 |
| White text | 3.34:1 |
Values
| HEX | #178FF4 |
| RGB | rgb(23, 143, 244) |
| HSL | hsl(207, 91%, 52%) |
| OKLCH | oklch(64.2% 0.179 251) |
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 #178FF4 | 3.34:1 | AA large text | Lc -65.7 | Content text, not long reading |
| Black text on #178FF4 | 6.27:1 | AA | Lc 43.8 | Non-text elements, placeholder text |
| #178FF4 text on white | 3.34:1 | AA large text | Lc 60.3 | Content text, not long reading |
| #178FF4 text on black | 6.27:1 | AA | Lc -41.4 | 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 500.
-
Step 50
50
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DEECFB
oklch(93.7% 0.025 250)
-
Step 200
200
#C2DCF9
oklch(88.5% 0.049 251.2)
-
Step 300
300
#96C5F8
oklch(80.9% 0.088 251)
-
Step 400
400
#57A5F4
oklch(70.7% 0.14 250.7)
-
Step 500
500 (this color)
#178FF4
oklch(64.2% 0.179 251)
-
Step 600
600
#0075CD
oklch(55.6% 0.161 250.9)
-
Step 700
700
#0062AE
oklch(49.1% 0.143 251.1)
-
Step 800
800
#005090
oklch(42.7% 0.125 251.1)
-
Step 900
900
#004379
oklch(37.8% 0.109 250.7)
-
Step 950
950
#032749
oklch(27% 0.074 251.3)
#178FF4 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) | #5B96F8 | 0.050 |
| Deuteranopia (no green cones) | #3384F2 | 0.028 |
| Tritanopia (no blue cones) | #00A7B5 | 0.130 |
| Achromatopsia (no color) | #8C8C8C | 0.179 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178FF4
#178FF4
oklch(64.2% 0.179 251)
- #C07C00
#C07C00
oklch(64.2% 0.138 71.3)
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 #178FF4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dodger Blue #1E90FF ΔE 0.017
- Dark Sky Blue #448EE4 ΔE 0.031
- Chefchaouen Blue #4895EF ΔE 0.034
- Soft Blue #6488EA ΔE 0.053
- Clear Blue #247AFD ΔE 0.057
- Cornflower Blue #6495ED ΔE 0.057
- Water Blue #0E87CC ΔE 0.062
- Cornflower #6A79F7 ΔE 0.076
Use #178FF4 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.