#043CFA
Closest named color: Vibrant Blue (#0339F8). oklch(49.1% 0.278 264.1), rgb(4, 60, 250).
Aa
White text reads best on this color (6.92:1).
About this color
#043CFA is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.278 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Vibrant Blue (#0339F8), ΔE 0.006 away. White text reads best on it, at 6.92:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.278) |
| Temperature | cool |
| Nearest name | Vibrant Blue (#0339F8) |
| Black text | 3.03:1 |
| White text | 6.92:1 |
Values
| HEX | #043CFA |
| RGB | rgb(4, 60, 250) |
| HSL | hsl(226, 97%, 50%) |
| OKLCH | oklch(49.1% 0.278 264.1) |
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 #043CFA | 6.92:1 | AA | Lc -87.3 | Fine for body text |
| Black text on #043CFA | 3.03:1 | AA large text | Lc 21.8 | Dividers and decoration only |
| #043CFA text on white | 6.92:1 | AA | Lc 82.2 | Fine for body text |
| #043CFA text on black | 3.03:1 | AA large text | Lc -19.7 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C7DAFF
oklch(88.6% 0.055 263.7)
-
Step 300
300
#A2C0FF
oklch(80.9% 0.096 264.7)
-
Step 400
400
#709DFF
oklch(70.7% 0.152 264.2)
-
Step 500
500
#4A80FF
oklch(63.1% 0.198 264.2)
-
Step 600
600
#245FFF
oklch(55.6% 0.245 264.2)
-
Step 700
700 (this color)
#043CFA
oklch(49.1% 0.278 264.1)
-
Step 800
800
#0635CA
oklch(42.8% 0.23 264.1)
-
Step 900
900
#0C329E
oklch(37.6% 0.179 264.2)
-
Step 950
950
#081F5D
oklch(27% 0.114 264.2)
#043CFA 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) | #0065FF | 0.081 |
| Deuteranopia (no green cones) | #004EF7 | 0.031 |
| Tritanopia (no blue cones) | #00779A | 0.209 |
| Achromatopsia (no color) | #5A5A5A | 0.279 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #043CFA
#043CFA
oklch(49.1% 0.278 264.1)
- #7B5B00
#7B5B00
oklch(49.1% 0.101 84.7)
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 #043CFA, closest first.
No curated palette has a color within ΔE 0.04 of #043CFA.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vibrant Blue #0339F8 ΔE 0.006
- Vivid Blue #152EFF ΔE 0.018
- Light Royal Blue #3A2EFE ΔE 0.037
- Rich Blue #021BF9 ΔE 0.041
- Electric Blue #0652FF ΔE 0.042
- Strong Blue #0C06F7 ΔE 0.052
- Blue #0000FF ΔE 0.052
- Primary Blue #0804F9 ΔE 0.052
Use #043CFA 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.