#374155
Closest named color: Dark Grey Blue (#29465B). oklch(37.5% 0.037 264), rgb(55, 65, 85).
Aa
White text reads best on this color (10.24:1).
About this color
#374155 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.037 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.022 away. White text reads best on it, at 10.24:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.037) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.04:1 |
| White text | 10.24:1 |
Values
| HEX | #374155 |
| RGB | rgb(55, 65, 85) |
| HSL | hsl(220, 21%, 27%) |
| OKLCH | oklch(37.5% 0.037 264) |
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 #374155 | 10.24:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #374155 | 2.04:1 | Fails | Lc 10.1 | Not readable |
| #374155 text on white | 10.24:1 | AAA | Lc 93.8 | Preferred for body text |
| #374155 text on black | 2.04:1 | Fails | Lc -8.8 | 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
#E7EAEF
oklch(93.6% 0.007 260.7)
-
Step 200
200
#D4D9E4
oklch(88.5% 0.016 266.3)
-
Step 300
300
#B8C1D3
oklch(81% 0.027 264.4)
-
Step 400
400
#93A1BD
oklch(70.8% 0.044 264.2)
-
Step 500
500
#788AAD
oklch(63.2% 0.057 263.5)
-
Step 600
600
#617398
oklch(55.6% 0.062 264.4)
-
Step 700
700
#506182
oklch(49.2% 0.057 263.3)
-
Step 800
800
#424F69
oklch(42.7% 0.047 263.9)
-
Step 900
900 (this color)
#374155
oklch(37.5% 0.037 264)
-
Step 950
950
#212632
oklch(26.9% 0.024 267.1)
#374155 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) | #3A4256 | 0.006 |
| Deuteranopia (no green cones) | #374055 | 0.003 |
| Tritanopia (no blue cones) | #2E4548 | 0.033 |
| Achromatopsia (no color) | #414141 | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374155
#374155
oklch(37.5% 0.037 264)
- #4A402A
#4A402A
oklch(37.6% 0.037 86.2)
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 #374155, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.022
- Charcoal #264653 ΔE 0.027
- Charcoal Grey #3C4142 ΔE 0.033
- Onyx #343A40 ΔE 0.038
- Dark Blue Grey #1F3B4D ΔE 0.042
- Dark Slate Gray #2F4F4F ΔE 0.050
- Prussian Blue #1D3557 ΔE 0.057
- Midnight Green #073B4C ΔE 0.059
Use #374155 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.