#243197
Closest named color: Sapphire (#2138AB). oklch(37.6% 0.165 270.3), rgb(36, 49, 151).
Aa
White text reads best on this color (10.70:1).
About this color
#243197 is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.165 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.037 away. White text reads best on it, at 10.70:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.165) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 1.96:1 |
| White text | 10.70:1 |
Values
| HEX | #243197 |
| RGB | rgb(36, 49, 151) |
| HSL | hsl(233, 61%, 37%) |
| OKLCH | oklch(37.6% 0.165 270.3) |
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 #243197 | 10.70:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #243197 | 1.96:1 | Fails | Lc 9.8 | Not readable |
| #243197 text on white | 10.70:1 | AAA | Lc 94.1 | Preferred for body text |
| #243197 text on black | 1.96:1 | Fails | Lc -8.4 | Not readable |
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 900.
-
Step 50
50
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CBD8FF
oklch(88.5% 0.056 270.7)
-
Step 300
300
#A9BEFF
oklch(80.9% 0.095 270.4)
-
Step 400
400
#7D99FF
oklch(70.7% 0.152 270.5)
-
Step 500
500
#5E7BFF
oklch(63.1% 0.198 270.4)
-
Step 600
600
#4358FF
oklch(55.5% 0.245 270.3)
-
Step 700
700
#353CEE
oklch(49.1% 0.256 270.4)
-
Step 800
800
#2A34C0
oklch(42.6% 0.213 270.2)
-
Step 900
900 (this color)
#243197
oklch(37.6% 0.165 270.3)
-
Step 950
950
#151E58
oklch(26.9% 0.104 270.8)
#243197 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) | #00439A | 0.045 |
| Deuteranopia (no green cones) | #003995 | 0.028 |
| Tritanopia (no blue cones) | #004C5F | 0.130 |
| Achromatopsia (no color) | #3E3E3E | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243197
#243197
oklch(37.6% 0.165 270.3)
- #513F00
#513F00
oklch(37.6% 0.077 90.4)
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 #243197, closest first.
No curated palette has a color within ΔE 0.04 of #243197.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.037
- Indigo Blue #3A18B1 ΔE 0.059
- Cobalt #1E488F ΔE 0.060
- Royal #0C1793 ΔE 0.061
- Blueberry #464196 ΔE 0.067
- Dark Slate Blue #483D8B ΔE 0.068
- Ultramarine #2000B1 ΔE 0.069
- Twilight Blue #0A437A ΔE 0.070
Use #243197 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.