#178AF3
Closest named color: Dodger Blue (#1E90FF). oklch(63% 0.183 252.5), rgb(23, 138, 243).
Aa
Black text reads best on this color (5.96:1).
About this color
#178AF3 is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.183 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Dodger Blue (#1E90FF), ΔE 0.023 away. Black text reads best on it, at 5.96:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.183) |
| Temperature | cool |
| Nearest name | Dodger Blue (#1E90FF) |
| Black text | 5.96:1 |
| White text | 3.51:1 |
Values
| HEX | #178AF3 |
| RGB | rgb(23, 138, 243) |
| HSL | hsl(209, 90%, 52%) |
| OKLCH | oklch(63% 0.183 252.5) |
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 #178AF3 | 3.51:1 | AA large text | Lc -67.6 | Content text, not long reading |
| Black text on #178AF3 | 5.96:1 | AA | Lc 42.0 | Non-text elements, placeholder text |
| #178AF3 text on white | 3.51:1 | AA large text | Lc 62.1 | Content text, not long reading |
| #178AF3 text on black | 5.96:1 | AA | Lc -39.6 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DEEBFB
oklch(93.5% 0.026 253.6)
-
Step 200
200
#C2DCFA
oklch(88.5% 0.05 252.1)
-
Step 300
300
#97C5F9
oklch(81% 0.089 252)
-
Step 400
400
#59A4F7
oklch(70.7% 0.143 252.6)
-
Step 500
500 (this color)
#178AF3
oklch(63% 0.183 252.5)
-
Step 600
600
#0073D2
oklch(55.5% 0.17 252.7)
-
Step 700
700
#0061B2
oklch(49.2% 0.149 252.5)
-
Step 800
800
#004F93
oklch(42.7% 0.13 252.6)
-
Step 900
900
#00427C
oklch(37.8% 0.114 252.4)
-
Step 950
950
#04274A
oklch(27.1% 0.076 252.4)
#178AF3 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) | #5293F7 | 0.046 |
| Deuteranopia (no green cones) | #2480F1 | 0.025 |
| Tritanopia (no blue cones) | #00A3B3 | 0.133 |
| Achromatopsia (no color) | #898989 | 0.183 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #178AF3
#178AF3
oklch(63% 0.183 252.5)
- #BA7A00
#BA7A00
oklch(63.1% 0.135 72.7)
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 #178AF3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dodger Blue #1E90FF ΔE 0.023
- Dark Sky Blue #448EE4 ΔE 0.036
- Chefchaouen Blue #4895EF ΔE 0.044
- Clear Blue #247AFD ΔE 0.045
- Soft Blue #6488EA ΔE 0.054
- Water Blue #0E87CC ΔE 0.059
- Cornflower Blue #6495ED ΔE 0.066
- Cornflower #6A79F7 ΔE 0.071
Use #178AF3 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.