#1E73B8
Closest named color: Mid Blue (#276AB3). oklch(54.2% 0.133 248.4), rgb(30, 115, 184).
Aa
White text reads best on this color (5.00:1).
About this color
#1E73B8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.133 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.025 away. White text reads best on it, at 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 4.19:1 |
| White text | 5.00:1 |
Values
| HEX | #1E73B8 |
| RGB | rgb(30, 115, 184) |
| HSL | hsl(207, 72%, 42%) |
| OKLCH | oklch(54.2% 0.133 248.4) |
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 #1E73B8 | 5.00:1 | AA | Lc -79.5 | Fine for body text |
| Black text on #1E73B8 | 4.19:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #1E73B8 text on white | 5.00:1 | AA | Lc 74.1 | Content text, not long reading |
| #1E73B8 text on black | 4.19:1 | AA large text | Lc -27.6 | Dividers and decoration only |
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
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C9DCEF
oklch(88.6% 0.033 248.2)
-
Step 300
300
#A3C5E6
oklch(81% 0.059 247.8)
-
Step 400
400
#70A6DA
oklch(70.8% 0.096 248.4)
-
Step 500
500
#478ED0
oklch(63% 0.123 248.9)
-
Step 600
600 (this color)
#1E73B8
oklch(54.2% 0.133 248.4)
-
Step 700
700
#1564A3
oklch(49.1% 0.124 248.5)
-
Step 800
800
#155284
oklch(42.8% 0.102 248.2)
-
Step 900
900
#1A446A
oklch(37.7% 0.08 248.9)
-
Step 950
950
#10283E
oklch(27% 0.051 248.4)
#1E73B8 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) | #5277BB | 0.046 |
| Deuteranopia (no green cones) | #3B69B7 | 0.031 |
| Tritanopia (no blue cones) | #00848C | 0.097 |
| Achromatopsia (no color) | #6F6F6F | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1E73B8
#1E73B8
oklch(54.2% 0.133 248.4)
- #9B6000
#9B6000
oklch(54.2% 0.118 68.7)
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 #1E73B8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.025
- Windows Blue #3778BF ΔE 0.025
- Nice Blue #107AB0 ΔE 0.026
- Flat Blue #3C73A8 ΔE 0.031
- French Blue #436BAD ΔE 0.033
- Muted Blue #3B719F ΔE 0.041
- Ocean Blue #03719C ΔE 0.046
- Dull Blue #49759C ΔE 0.055
Use #1E73B8 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.