#333B53
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.6% 0.043 269.9), rgb(51, 59, 83).
Aa
White text reads best on this color (11.10:1).
About this color
#333B53 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.043 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.030 away. White text reads best on it, at 11.10:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.89:1 |
| White text | 11.10:1 |
Values
| HEX | #333B53 |
| RGB | rgb(51, 59, 83) |
| HSL | hsl(225, 24%, 26%) |
| OKLCH | oklch(35.6% 0.043 269.9) |
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 #333B53 | 11.10:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #333B53 | 1.89:1 | Fails | Lc 8.2 | Not readable |
| #333B53 text on white | 11.10:1 | AAA | Lc 95.7 | Preferred for body text |
| #333B53 text on black | 1.89:1 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAF0
oklch(93.6% 0.009 264.5)
-
Step 200
200
#D4D9E5
oklch(88.5% 0.017 267.8)
-
Step 300
300
#B8C0D6
oklch(80.9% 0.032 269.8)
-
Step 400
400
#94A0C2
oklch(70.8% 0.052 269.8)
-
Step 500
500
#7A88B2
oklch(63.1% 0.066 270.2)
-
Step 600
600
#63719E
oklch(55.5% 0.072 270.6)
-
Step 700
700
#525F87
oklch(49.1% 0.066 270)
-
Step 800
800
#434E6E
oklch(42.8% 0.055 269.4)
-
Step 900
900 (this color)
#333B53
oklch(35.6% 0.043 269.9)
-
Step 950
950
#212634
oklch(27% 0.027 269.3)
#333B53 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) | #333D54 | 0.006 |
| Deuteranopia (no green cones) | #303A52 | 0.006 |
| Tritanopia (no blue cones) | #2A4043 | 0.040 |
| Achromatopsia (no color) | #3C3C3C | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333B53
#333B53
oklch(35.6% 0.043 269.9)
- #453B21
#453B21
oklch(35.6% 0.043 89.1)
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 #333B53, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.030
- Onyx #343A40 ΔE 0.033
- Dark Grey Blue #29465B ΔE 0.035
- Charcoal #264653 ΔE 0.038
- Prussian Blue #1D3557 ΔE 0.039
- Charcoal Grey #3C4142 ΔE 0.043
- Gunmetal #293241 ΔE 0.043
- Midnight Green #073B4C ΔE 0.049
Use #333B53 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.