#274C51
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39.1% 0.043 206.9), rgb(39, 76, 81).
Aa
White text reads best on this color (9.37:1).
About this color
#274C51 is a dark, muted teal or cyan. In OKLCH its lightness is 39%, its chroma 0.043 and its hue 207°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.015 away. White text reads best on it, at 9.37:1.
| Hue family | Teals and cyans |
| Lightness | dark (39%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.23:1 |
| White text | 9.37:1 |
Values
| HEX | #274C51 |
| RGB | rgb(39, 76, 81) |
| HSL | hsl(187, 35%, 24%) |
| OKLCH | oklch(39.1% 0.043 206.9) |
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 #274C51 | 9.37:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #274C51 | 2.23:1 | Fails | Lc 12.4 | Not readable |
| #274C51 text on white | 9.37:1 | AAA | Lc 91.6 | Preferred for body text |
| #274C51 text on black | 2.23:1 | Fails | Lc -10.8 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E3ECED
oklch(93.7% 0.01 204.9)
-
Step 200
200
#CCDDDF
oklch(88.5% 0.018 205.3)
-
Step 300
300
#A9C7CB
oklch(80.9% 0.033 206.4)
-
Step 400
400
#7AAAB1
oklch(70.6% 0.052 207.3)
-
Step 500
500
#56959E
oklch(63.1% 0.066 207.4)
-
Step 600
600
#387F89
oklch(55.5% 0.072 207.7)
-
Step 700
700
#2A6B74
oklch(49% 0.067 207.7)
-
Step 800
800
#24585E
oklch(42.8% 0.056 205.6)
-
Step 900
900 (this color)
#274C51
oklch(39.1% 0.043 206.9)
-
Step 950
950
#152A2D
oklch(26.9% 0.027 207.4)
#274C51 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) | #474951 | 0.043 |
| Deuteranopia (no green cones) | #404451 | 0.039 |
| Tritanopia (no blue cones) | #104F4D | 0.022 |
| Achromatopsia (no color) | #464646 | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #274C51
#274C51
oklch(39.1% 0.043 206.9)
- #5A3C39
#5A3C39
oklch(39% 0.043 25.6)
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 #274C51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.015
- Charcoal #264653 ΔE 0.022
- Dark Teal #014D4E ΔE 0.026
- Dark Grey Blue #29465B ΔE 0.030
- Deep Teal #00555A ΔE 0.032
- Dark Blue Green #005249 ΔE 0.036
- Charcoal Grey #3C4142 ΔE 0.042
- Onyx #343A40 ΔE 0.057
Use #274C51 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.