#3D4757
Closest named color: Dark Grey Blue (#29465B). oklch(39.5% 0.03 259.7), rgb(61, 71, 87).
Aa
White text reads best on this color (9.38:1).
About this color
#3D4757 is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.030 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.028 away. White text reads best on it, at 9.38:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.030) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.23:1 |
| White text | 9.38:1 |
Values
| HEX | #3D4757 |
| RGB | rgb(61, 71, 87) |
| HSL | hsl(217, 18%, 29%) |
| OKLCH | oklch(39.5% 0.03 259.7) |
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 #3D4757 | 9.38:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #3D4757 | 2.23:1 | Fails | Lc 12.3 | Not readable |
| #3D4757 text on white | 9.38:1 | AAA | Lc 91.7 | Preferred for body text |
| #3D4757 text on black | 2.23:1 | Fails | Lc -10.7 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E7EAEE
oklch(93.6% 0.006 255.5)
-
Step 200
200
#D4D9E2
oklch(88.4% 0.013 262.4)
-
Step 300
300
#B8C1D0
oklch(80.9% 0.023 260.7)
-
Step 400
400
#94A1B8
oklch(70.6% 0.037 261.9)
-
Step 500
500
#798AA6
oklch(63% 0.047 260.4)
-
Step 600
600
#627491
oklch(55.5% 0.05 259.9)
-
Step 700
700
#51617C
oklch(49% 0.048 260.8)
-
Step 800
800
#435065
oklch(42.9% 0.039 259.9)
-
Step 900
900 (this color)
#3D4757
oklch(39.5% 0.03 259.7)
-
Step 950
950
#212730
oklch(27.1% 0.019 258.4)
#3D4757 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) | #424858 | 0.009 |
| Deuteranopia (no green cones) | #3F4557 | 0.007 |
| Tritanopia (no blue cones) | #364A4C | 0.026 |
| Achromatopsia (no color) | #464646 | 0.030 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D4757
#3D4757
oklch(39.5% 0.03 259.7)
- #4F4534
#4F4534
oklch(39.6% 0.03 80.8)
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 #3D4757, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.028
- Charcoal #264653 ΔE 0.032
- Charcoal Grey #3C4142 ΔE 0.036
- Dark Slate Gray #2F4F4F ΔE 0.037
- Onyx #343A40 ΔE 0.053
- Dark Teal #014D4E ΔE 0.060
- Dark Blue Grey #1F3B4D ΔE 0.061
- Deep Teal #00555A ΔE 0.061
Use #3D4757 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.