#1F73B1
Closest named color: Nice Blue (#107AB0). oklch(53.8% 0.124 246), rgb(31, 115, 177).
Aa
White text reads best on this color (5.06:1).
About this color
#1F73B1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.124 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.021 away. White text reads best on it, at 5.06:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.14:1 |
| White text | 5.06:1 |
Values
| HEX | #1F73B1 |
| RGB | rgb(31, 115, 177) |
| HSL | hsl(205, 70%, 41%) |
| OKLCH | oklch(53.8% 0.124 246) |
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 #1F73B1 | 5.06:1 | AA | Lc -80.0 | Fine for body text |
| Black text on #1F73B1 | 4.14:1 | AA large text | Lc 29.5 | Dividers and decoration only |
| #1F73B1 text on white | 5.06:1 | AA | Lc 74.6 | Content text, not long reading |
| #1F73B1 text on black | 4.14:1 | AA large text | Lc -27.2 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C9DCED
oklch(88.6% 0.031 245.1)
-
Step 300
300
#A4C5E3
oklch(80.9% 0.055 246)
-
Step 400
400
#71A6D5
oklch(70.6% 0.089 246.2)
-
Step 500
500
#488FCA
oklch(63% 0.114 246.1)
-
Step 600
600 (this color)
#1F73B1
oklch(53.8% 0.124 246)
-
Step 700
700
#17659D
oklch(49% 0.115 245.8)
-
Step 800
800
#175380
oklch(42.8% 0.096 245.8)
-
Step 900
900
#1B4566
oklch(37.8% 0.073 245.3)
-
Step 950
950
#11283C
oklch(26.9% 0.047 246.9)
#1F73B1 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) | #5676B4 | 0.050 |
| Deuteranopia (no green cones) | #4169B0 | 0.034 |
| Tritanopia (no blue cones) | #00828A | 0.087 |
| Achromatopsia (no color) | #6E6E6E | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F73B1
#1F73B1
oklch(53.8% 0.124 246)
- #9C5D00
#9C5D00
oklch(53.7% 0.12 65.7)
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 #1F73B1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.021
- Flat Blue #3C73A8 ΔE 0.023
- Mid Blue #276AB3 ΔE 0.026
- Windows Blue #3778BF ΔE 0.031
- French Blue #436BAD ΔE 0.032
- Muted Blue #3B719F ΔE 0.032
- Ocean Blue #03719C ΔE 0.036
- Dull Blue #49759C ΔE 0.046
Use #1F73B1 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.