#1F63B7
Closest named color: Mid Blue (#276AB3). oklch(50.5% 0.149 256.1), rgb(31, 99, 183).
Aa
White text reads best on this color (5.95:1).
About this color
#1F63B7 is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.149 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.023 away. White text reads best on it, at 5.95:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.52:1 |
| White text | 5.95:1 |
Values
| HEX | #1F63B7 |
| RGB | rgb(31, 99, 183) |
| HSL | hsl(213, 71%, 42%) |
| OKLCH | oklch(50.5% 0.149 256.1) |
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 #1F63B7 | 5.95:1 | AA | Lc -84.5 | Fine for body text |
| Black text on #1F63B7 | 3.52:1 | AA large text | Lc 24.8 | Dividers and decoration only |
| #1F63B7 text on white | 5.95:1 | AA | Lc 79.3 | Fine for body text |
| #1F63B7 text on black | 3.52:1 | AA large text | Lc -22.5 | 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 700.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF4
oklch(88.5% 0.04 255.3)
-
Step 300
300
#A3C3EF
oklch(80.9% 0.072 256.4)
-
Step 400
400
#70A3E7
oklch(70.8% 0.114 255.9)
-
Step 500
500
#488AE0
oklch(63.1% 0.147 256)
-
Step 600
600
#2872CE
oklch(55.6% 0.159 256)
-
Step 700
700 (this color)
#1F63B7
oklch(50.5% 0.149 256.1)
-
Step 800
800
#194E90
oklch(42.7% 0.122 256.1)
-
Step 900
900
#1B4173
oklch(37.6% 0.096 256.4)
-
Step 950
950
#112743
oklch(27.1% 0.059 255.4)
#1F63B7 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) | #366BBA | 0.031 |
| Deuteranopia (no green cones) | #0E5DB5 | 0.020 |
| Tritanopia (no blue cones) | #007784 | 0.112 |
| Achromatopsia (no color) | #646464 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F63B7
#1F63B7
oklch(50.5% 0.149 256.1)
- #875B00
#875B00
oklch(50.6% 0.106 76.2)
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 #1F63B7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.023
- French Blue #436BAD ΔE 0.044
- Peacock Blue #016795 ΔE 0.060
- Denim Blue #3B5B92 ΔE 0.061
- Flat Blue #3C73A8 ΔE 0.062
- Dusky Blue #475F94 ΔE 0.063
- Windows Blue #3778BF ΔE 0.064
- Ocean Blue #03719C ΔE 0.065
Use #1F63B7 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.