#1F73DC
Closest named color: Cerulean Blue (#056EEE). oklch(56.6% 0.178 256.8), rgb(31, 115, 220).
Aa
White text reads best on this color (4.62:1).
About this color
#1F73DC is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.178 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.032 away. White text reads best on it, at 4.62:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.178) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.54:1 |
| White text | 4.62:1 |
Values
| HEX | #1F73DC |
| RGB | rgb(31, 115, 220) |
| HSL | hsl(213, 75%, 49%) |
| OKLCH | oklch(56.6% 0.178 256.8) |
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 #1F73DC | 4.62:1 | AA | Lc -77.0 | Fine for body text |
| Black text on #1F73DC | 4.54:1 | AA | Lc 32.6 | Non-text elements, placeholder text |
| #1F73DC text on white | 4.62:1 | AA | Lc 71.5 | Content text, not long reading |
| #1F73DC text on black | 4.54:1 | AA | Lc -30.2 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C7DBF7
oklch(88.5% 0.044 256.8)
-
Step 300
300
#9FC3F5
oklch(80.9% 0.081 256.7)
-
Step 400
400
#6AA2EF
oklch(70.6% 0.128 256.6)
-
Step 500
500
#4089EA
oklch(63.2% 0.163 256.6)
-
Step 600
600 (this color)
#1F73DC
oklch(56.6% 0.178 256.8)
-
Step 700
700
#0B5DBC
oklch(49.1% 0.166 256.8)
-
Step 800
800
#0F4C98
oklch(42.6% 0.138 257)
-
Step 900
900
#164179
oklch(37.8% 0.106 256.6)
-
Step 950
950
#0E2647
oklch(27% 0.068 257.1)
#1F73DC 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) | #357EE0 | 0.035 |
| Deuteranopia (no green cones) | #006DDA | 0.020 |
| Tritanopia (no blue cones) | #008C9D | 0.134 |
| Achromatopsia (no color) | #757575 | 0.178 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F73DC
#1F73DC
oklch(56.6% 0.178 256.8)
- #9D6B00
#9D6B00
oklch(56.6% 0.119 76.6)
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 #1F73DC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.032
- Royal Blue #4169E1 ΔE 0.033
- Windows Blue #3778BF ΔE 0.051
- Clear Blue #247AFD ΔE 0.052
- Neon Blue #4361EE ΔE 0.056
- Azul #1D5DEC ΔE 0.061
- Bright Blue #0165FC ΔE 0.062
- Water Blue #0E87CC ΔE 0.063
Use #1F73DC 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.