#011DBA
Closest named color: True Blue (#010FCC). oklch(37.7% 0.233 264.3), rgb(1, 29, 186).
Aa
White text reads best on this color (11.13:1).
About this color
#011DBA is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.233 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is True Blue (#010FCC), ΔE 0.029 away. White text reads best on it, at 11.13:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.233) |
| Temperature | cool |
| Nearest name | True Blue (#010FCC) |
| Black text | 1.88:1 |
| White text | 11.13:1 |
Values
| HEX | #011DBA |
| RGB | rgb(1, 29, 186) |
| HSL | hsl(231, 99%, 37%) |
| OKLCH | oklch(37.7% 0.233 264.3) |
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 #011DBA | 11.13:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #011DBA | 1.88:1 | Fails | Lc 10.2 | Not readable |
| #011DBA text on white | 11.13:1 | AAA | Lc 93.7 | Preferred for body text |
| #011DBA text on black | 1.88:1 | Fails | Lc -8.8 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C7D9FF
oklch(88.4% 0.056 265.2)
-
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
#4B80FF
oklch(63.1% 0.197 264.4)
-
Step 600
600
#255FFF
oklch(55.6% 0.244 264.3)
-
Step 700
700
#0538FF
oklch(49.1% 0.287 264.3)
-
Step 800
800
#0300EC
oklch(42.7% 0.295 264.3)
-
Step 900
900 (this color)
#011DBA
oklch(37.7% 0.233 264.3)
-
Step 950
950
#02176D
oklch(27.1% 0.148 264.4)
#011DBA 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) | #0044BE | 0.072 |
| Deuteranopia (no green cones) | #0032B7 | 0.033 |
| Tritanopia (no blue cones) | #00526F | 0.174 |
| Achromatopsia (no color) | #3B3B3B | 0.235 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #011DBA
#011DBA
oklch(37.7% 0.233 264.3)
- #553D00
#553D00
oklch(37.7% 0.077 83.5)
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 #011DBA, closest first.
No curated palette has a color within ΔE 0.04 of #011DBA.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- True Blue #010FCC ΔE 0.029
- Medium Blue #0000CD ΔE 0.033
- Ultramarine #2000B1 ΔE 0.034
- Cobalt Blue #030AA7 ΔE 0.042
- Ultramarine Blue #1805DB ΔE 0.054
- Sapphire #2138AB ΔE 0.059
- Pure Blue #0203E2 ΔE 0.064
- Indigo Blue #3A18B1 ΔE 0.064
Use #011DBA 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.