#434B57
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41% 0.023 258.4), rgb(67, 75, 87).
Aa
White text reads best on this color (8.81:1).
About this color
#434B57 is a dark close to neutral grey. In OKLCH its lightness is 41%, its chroma 0.023. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.035 away. White text reads best on it, at 8.81:1.
| Hue family | Neutrals |
| Lightness | dark (41%) |
| Chroma | close to neutral grey (0.023) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.38:1 |
| White text | 8.81:1 |
Values
| HEX | #434B57 |
| RGB | rgb(67, 75, 87) |
| HSL | hsl(216, 13%, 30%) |
| OKLCH | oklch(41% 0.023 258.4) |
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 #434B57 | 8.81:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #434B57 | 2.38:1 | Fails | Lc 13.8 | Not readable |
| #434B57 text on white | 8.81:1 | AAA | Lc 90.2 | Preferred for body text |
| #434B57 text on black | 2.38:1 | Fails | Lc -12.1 | 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 800.
-
Step 50
50
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#E8EAEC
oklch(93.6% 0.003 247.9)
-
Step 200
200
#D6D9DE
oklch(88.4% 0.008 260.7)
-
Step 300
300
#BBC1C9
oklch(80.9% 0.013 255.5)
-
Step 400
400
#99A1AE
oklch(70.7% 0.021 260.2)
-
Step 500
500
#808A9A
oklch(63.1% 0.027 259.8)
-
Step 600
600
#697485
oklch(55.6% 0.03 259)
-
Step 700
700
#576171
oklch(49% 0.029 259.8)
-
Step 800
800 (this color)
#434B57
oklch(41% 0.023 258.4)
-
Step 900
900
#3C424B
oklch(37.7% 0.017 258.4)
-
Step 950
950
#23272C
oklch(27.1% 0.011 254)
#434B57 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) | #474B58 | 0.007 |
| Deuteranopia (no green cones) | #454A57 | 0.004 |
| Tritanopia (no blue cones) | #3E4D4F | 0.019 |
| Achromatopsia (no color) | #4A4A4A | 0.023 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #434B57
#434B57
oklch(41% 0.023 258.4)
- #51493D
#51493D
oklch(41% 0.022 78)
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 #434B57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.041
- Charcoal Grey #3C4142 ΔE 0.044
- Charcoal #264653 ΔE 0.044
- YInMn Blue #415A77 ΔE 0.060
- Deep Teal #00555A ΔE 0.060
- Dusty Grape #545775 ΔE 0.063
- Dark Teal #014D4E ΔE 0.064
Use #434B57 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.