#133D5B
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.7% 0.07 243.6), rgb(19, 61, 91).
Aa
White text reads best on this color (11.37:1).
About this color
#133D5B is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.070 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.025 away. White text reads best on it, at 11.37:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.070) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.84:1 |
| White text | 11.37:1 |
Values
| HEX | #133D5B |
| RGB | rgb(19, 61, 91) |
| HSL | hsl(205, 65%, 22%) |
| OKLCH | oklch(34.7% 0.07 243.6) |
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 #133D5B | 11.37:1 | AAA | Lc -99.7 | Preferred for body text |
| Black text on #133D5B | 1.84:1 | Fails | Lc 7.9 | Not readable |
| #133D5B text on white | 11.37:1 | AAA | Lc 96.0 | Preferred for body text |
| #133D5B text on black | 1.84:1 | Fails | Lc 0.0 | 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 900.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEB
oklch(88.6% 0.028 243.1)
-
Step 300
300
#A4C5E0
oklch(80.8% 0.052 243.1)
-
Step 400
400
#72A7D1
oklch(70.7% 0.083 243.2)
-
Step 500
500
#4A90C5
oklch(63.1% 0.107 243.5)
-
Step 600
600
#2979B2
oklch(55.5% 0.117 244.1)
-
Step 700
700
#1A6699
oklch(49.1% 0.108 243.7)
-
Step 800
800
#19537C
oklch(42.6% 0.09 244)
-
Step 900
900 (this color)
#133D5B
oklch(34.7% 0.07 243.6)
-
Step 950
950
#12293A
oklch(27.1% 0.043 242.6)
#133D5B 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) | #2F3E5C | 0.031 |
| Deuteranopia (no green cones) | #25375A | 0.024 |
| Tritanopia (no blue cones) | #004448 | 0.048 |
| Achromatopsia (no color) | #3A3A3A | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #133D5B
#133D5B
oklch(34.7% 0.07 243.6)
- #53310B
#53310B
oklch(34.8% 0.07 63.9)
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 #133D5B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.025
- Prussian Blue #1D3557 ΔE 0.025
- Midnight Green #073B4C ΔE 0.029
- Marine Blue #01386A ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.039
- Charcoal #264653 ΔE 0.042
- Gunmetal #293241 ΔE 0.053
- Marine #042E60 ΔE 0.053
Use #133D5B 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.