#0243A1
Closest named color: Sapphire (#2138AB). oklch(41.1% 0.164 259.8), rgb(2, 67, 161).
Aa
White text reads best on this color (9.05:1).
About this color
#0243A1 is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.164 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.032 away. White text reads best on it, at 9.05:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.164) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.32:1 |
| White text | 9.05:1 |
Values
| HEX | #0243A1 |
| RGB | rgb(2, 67, 161) |
| HSL | hsl(215, 98%, 32%) |
| OKLCH | oklch(41.1% 0.164 259.8) |
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 #0243A1 | 9.05:1 | AAA | Lc -94.4 | Preferred for body text |
| Black text on #0243A1 | 2.32:1 | Fails | Lc 14.0 | Not readable |
| #0243A1 text on white | 9.05:1 | AAA | Lc 90.0 | Fine for body text |
| #0243A1 text on black | 2.32:1 | Fails | Lc -12.3 | 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 800.
-
Step 50
50
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C5DAFD
oklch(88.4% 0.054 260.6)
-
Step 300
300
#9CC2FF
oklch(80.9% 0.096 259.7)
-
Step 400
400
#659FFF
oklch(70.6% 0.154 260)
-
Step 500
500
#3984FD
oklch(63.1% 0.195 259.7)
-
Step 600
600
#1169EC
oklch(55.5% 0.213 259.8)
-
Step 700
700
#0157CE
oklch(49.2% 0.198 259.8)
-
Step 800
800 (this color)
#0243A1
oklch(41.1% 0.164 259.8)
-
Step 900
900
#123D84
oklch(37.6% 0.129 260.1)
-
Step 950
950
#0C254D
oklch(27.1% 0.08 259.5)
#0243A1 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) | #0050A4 | 0.035 |
| Deuteranopia (no green cones) | #00429F | 0.004 |
| Tritanopia (no blue cones) | #005B6B | 0.124 |
| Achromatopsia (no color) | #494949 | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0243A1
#0243A1
oklch(41.1% 0.164 259.8)
- #634400
#634400
oklch(41.1% 0.085 79.1)
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 #0243A1, closest first.
No curated palette has a color within ΔE 0.04 of #0243A1.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.032
- Cobalt #1E488F ΔE 0.037
- Dusk Blue #26538D ΔE 0.064
- Light Navy #155084 ΔE 0.064
- Blue Blue #2242C7 ΔE 0.065
- Twilight Blue #0A437A ΔE 0.065
- Blueberry #464196 ΔE 0.066
- Deep Sea Blue #015482 ΔE 0.074
Use #0243A1 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.