#243DF3
Closest named color: Vibrant Blue (#0339F8). oklch(49.1% 0.265 267.1), rgb(36, 61, 243).
Aa
White text reads best on this color (6.91:1).
About this color
#243DF3 is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.265 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Vibrant Blue (#0339F8), ΔE 0.020 away. White text reads best on it, at 6.91:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.265) |
| Temperature | cool |
| Nearest name | Vibrant Blue (#0339F8) |
| Black text | 3.03:1 |
| White text | 6.91:1 |
Values
| HEX | #243DF3 |
| RGB | rgb(36, 61, 243) |
| HSL | hsl(233, 90%, 55%) |
| OKLCH | oklch(49.1% 0.265 267.1) |
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 #243DF3 | 6.91:1 | AA | Lc -87.6 | Fine for body text |
| Black text on #243DF3 | 3.03:1 | AA large text | Lc 21.5 | Dividers and decoration only |
| #243DF3 text on white | 6.91:1 | AA | Lc 82.5 | Fine for body text |
| #243DF3 text on black | 3.03:1 | AA large text | Lc -19.4 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#C9D9FF
oklch(88.6% 0.055 267.2)
-
Step 300
300
#A5BFFF
oklch(80.9% 0.095 267.2)
-
Step 400
400
#769BFF
oklch(70.7% 0.152 267.2)
-
Step 500
500
#547EFF
oklch(63.1% 0.197 267)
-
Step 600
600
#355CFF
oklch(55.6% 0.244 267)
-
Step 700
700 (this color)
#243DF3
oklch(49.1% 0.265 267.1)
-
Step 800
800
#1D35C4
oklch(42.6% 0.22 267)
-
Step 900
900
#1A329A
oklch(37.7% 0.171 266.9)
-
Step 950
950
#0F1F5A
oklch(27% 0.108 267)
#243DF3 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) | #0064F8 | 0.075 |
| Deuteranopia (no green cones) | #004FF0 | 0.031 |
| Tritanopia (no blue cones) | #007496 | 0.201 |
| Achromatopsia (no color) | #5A5A5A | 0.266 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243DF3
#243DF3
oklch(49.1% 0.265 267.1)
- #795C00
#795C00
oklch(49.1% 0.1 87.1)
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 #243DF3, closest first.
No curated palette has a color within ΔE 0.04 of #243DF3.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vibrant Blue #0339F8 ΔE 0.020
- Light Royal Blue #3A2EFE ΔE 0.029
- Vivid Blue #152EFF ΔE 0.029
- Electric Blue #0652FF ΔE 0.042
- Rich Blue #021BF9 ΔE 0.050
- Strong Blue #0C06F7 ΔE 0.060
- Primary Blue #0804F9 ΔE 0.061
- Azul #1D5DEC ΔE 0.062
Use #243DF3 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.