#133C57
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.2% 0.065 241.4), rgb(19, 60, 87).
Aa
White text reads best on this color (11.59:1).
About this color
#133C57 is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.065 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.019 away. White text reads best on it, at 11.59:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.81:1 |
| White text | 11.59:1 |
Values
| HEX | #133C57 |
| RGB | rgb(19, 60, 87) |
| HSL | hsl(204, 64%, 21%) |
| OKLCH | oklch(34.2% 0.065 241.4) |
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 #133C57 | 11.59:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #133C57 | 1.81:1 | Fails | Lc 7.5 | Not readable |
| #133C57 text on white | 11.59:1 | AAA | Lc 96.4 | Preferred for body text |
| #133C57 text on black | 1.81:1 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEA
oklch(88.5% 0.027 241.2)
-
Step 300
300
#A5C5DE
oklch(80.8% 0.049 241.8)
-
Step 400
400
#74A7CD
oklch(70.7% 0.078 241.4)
-
Step 500
500
#4D91C1
oklch(63.2% 0.1 241.5)
-
Step 600
600
#2C7AAD
oklch(55.6% 0.109 241.6)
-
Step 700
700
#1D6795
oklch(49.2% 0.102 241.3)
-
Step 800
800
#1B5479
oklch(42.8% 0.084 241.5)
-
Step 900
900 (this color)
#133C57
oklch(34.2% 0.065 241.4)
-
Step 950
950
#122939
oklch(27% 0.042 241)
#133C57 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) | #303C58 | 0.033 |
| Deuteranopia (no green cones) | #263657 | 0.026 |
| Tritanopia (no blue cones) | #004345 | 0.047 |
| Achromatopsia (no color) | #393939 | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #133C57
#133C57
oklch(34.2% 0.065 241.4)
- #503010
#503010
oklch(34.2% 0.065 62.3)
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 #133C57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.019
- Midnight Green #073B4C ΔE 0.022
- Prussian Blue #1D3557 ΔE 0.023
- Marine Blue #01386A ΔE 0.039
- Dark Grey Blue #29465B ΔE 0.042
- Charcoal #264653 ΔE 0.042
- Gunmetal #293241 ΔE 0.047
- Onyx #343A40 ΔE 0.052
Use #133C57 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.