#0531B9
Closest named color: Sapphire (#2138AB). oklch(40.3% 0.214 264), rgb(5, 49, 185).
Aa
White text reads best on this color (9.78:1).
About this color
#0531B9 is a dark, vivid blue. In OKLCH its lightness is 40%, its chroma 0.214 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.033 away. White text reads best on it, at 9.78:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | vivid (0.214) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.14:1 |
| White text | 9.78:1 |
Values
| HEX | #0531B9 |
| RGB | rgb(5, 49, 185) |
| HSL | hsl(225, 95%, 37%) |
| OKLCH | oklch(40.3% 0.214 264) |
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 #0531B9 | 9.78:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #0531B9 | 2.14:1 | Fails | Lc 12.6 | Not readable |
| #0531B9 text on white | 9.78:1 | AAA | Lc 91.3 | Preferred for body text |
| #0531B9 text on black | 2.14:1 | Fails | Lc -11.0 | 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
#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
#A1C0FF
oklch(80.8% 0.096 264.1)
-
Step 400
400
#6F9DFF
oklch(70.7% 0.152 263.9)
-
Step 500
500
#4A80FF
oklch(63.1% 0.198 264.2)
-
Step 600
600
#235FFF
oklch(55.6% 0.245 264.1)
-
Step 700
700
#0A44F0
oklch(49.2% 0.259 264)
-
Step 800
800 (this color)
#0531B9
oklch(40.3% 0.214 264)
-
Step 900
900
#103598
oklch(37.7% 0.167 264.1)
-
Step 950
950
#0A2059
oklch(26.9% 0.107 264.3)
#0531B9 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) | #004CBD | 0.059 |
| Deuteranopia (no green cones) | #003BB7 | 0.019 |
| Tritanopia (no blue cones) | #005972 | 0.162 |
| Achromatopsia (no color) | #444444 | 0.215 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0531B9
#0531B9
oklch(40.3% 0.214 264)
- #5D4400
#5D4400
oklch(40.3% 0.083 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 #0531B9, closest first.
No curated palette has a color within ΔE 0.04 of #0531B9.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.033
- True Blue #010FCC ΔE 0.047
- Blue Blue #2242C7 ΔE 0.051
- Medium Blue #0000CD ΔE 0.055
- Ultramarine #2000B1 ΔE 0.057
- Indigo Blue #3A18B1 ΔE 0.060
- Ultramarine Blue #1805DB ΔE 0.061
- Majorelle Blue #3F37C9 ΔE 0.066
Use #0531B9 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.