#343A57
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.6% 0.051 274.6), rgb(52, 58, 87).
Aa
White text reads best on this color (11.11:1).
About this color
#343A57 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.051 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.035 away. White text reads best on it, at 11.11:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.88:1 |
| White text | 11.11:1 |
Values
| HEX | #343A57 |
| RGB | rgb(52, 58, 87) |
| HSL | hsl(230, 25%, 27%) |
| OKLCH | oklch(35.6% 0.051 274.6) |
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 #343A57 | 11.11:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #343A57 | 1.88:1 | Fails | Lc 8.2 | Not readable |
| #343A57 text on white | 11.11:1 | AAA | Lc 95.7 | Preferred for body text |
| #343A57 text on black | 1.88:1 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7E9F1
oklch(93.5% 0.011 274.9)
-
Step 200
200
#D5D8E8
oklch(88.5% 0.022 277.5)
-
Step 300
300
#B9BFDA
oklch(80.9% 0.039 275.6)
-
Step 400
400
#959EC7
oklch(70.7% 0.061 275.1)
-
Step 500
500
#7B86B9
oklch(63.1% 0.078 274.6)
-
Step 600
600
#646FA5
oklch(55.5% 0.085 274.5)
-
Step 700
700
#535D8E
oklch(49.1% 0.08 274.3)
-
Step 800
800
#444C73
oklch(42.7% 0.066 274.4)
-
Step 900
900 (this color)
#343A57
oklch(35.6% 0.051 274.6)
-
Step 950
950
#222536
oklch(27% 0.032 276.3)
#343A57 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) | #313D58 | 0.010 |
| Deuteranopia (no green cones) | #2E3A56 | 0.009 |
| Tritanopia (no blue cones) | #2A4044 | 0.047 |
| Achromatopsia (no color) | #3B3B3B | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343A57
#343A57
oklch(35.6% 0.051 274.6)
- #453C1B
#453C1B
oklch(35.7% 0.051 94.4)
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 #343A57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.035
- Prussian Blue #1D3557 ΔE 0.038
- Dark Grey Blue #29465B ΔE 0.038
- Onyx #343A40 ΔE 0.041
- Charcoal #264653 ΔE 0.044
- Gunmetal #293241 ΔE 0.047
- Charcoal Grey #3C4142 ΔE 0.051
- Space Cadet #2B2D42 ΔE 0.053
Use #343A57 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.