#274E55
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39.8% 0.046 210.5), rgb(39, 78, 85).
Aa
White text reads best on this color (9.10:1).
About this color
#274E55 is a dark, muted teal or cyan. In OKLCH its lightness is 40%, its chroma 0.046 and its hue 210°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.014 away. White text reads best on it, at 9.10:1.
| Hue family | Teals and cyans |
| Lightness | dark (40%) |
| Chroma | muted (0.046) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.30:1 |
| White text | 9.10:1 |
Values
| HEX | #274E55 |
| RGB | rgb(39, 78, 85) |
| HSL | hsl(189, 37%, 24%) |
| OKLCH | oklch(39.8% 0.046 210.5) |
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 #274E55 | 9.10:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #274E55 | 2.30:1 | Fails | Lc 13.1 | Not readable |
| #274E55 text on white | 9.10:1 | AAA | Lc 90.8 | Preferred for body text |
| #274E55 text on black | 2.30:1 | Fails | Lc -11.5 | 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
#CCDDE0
oklch(88.6% 0.019 209.4)
-
Step 300
300
#A8C7CD
oklch(80.9% 0.034 210.7)
-
Step 400
400
#78AAB4
oklch(70.6% 0.055 211.4)
-
Step 500
500
#5395A1
oklch(63.1% 0.07 210.6)
-
Step 600
600
#347F8C
oklch(55.5% 0.076 210.7)
-
Step 700
700
#256B77
oklch(49% 0.071 211)
-
Step 800
800
#215861
oklch(42.8% 0.059 209.9)
-
Step 900
900 (this color)
#274E55
oklch(39.8% 0.046 210.5)
-
Step 950
950
#142A2E
oklch(26.9% 0.029 210.5)
#274E55 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) | #484B55 | 0.043 |
| Deuteranopia (no green cones) | #414655 | 0.040 |
| Tritanopia (no blue cones) | #0B5150 | 0.024 |
| Achromatopsia (no color) | #484848 | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #274E55
#274E55
oklch(39.8% 0.046 210.5)
- #5D3E38
#5D3E38
oklch(39.8% 0.045 31.3)
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 #274E55, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.014
- Charcoal #264653 ΔE 0.026
- Deep Teal #00555A ΔE 0.028
- Dark Teal #014D4E ΔE 0.029
- Dark Grey Blue #29465B ΔE 0.031
- Dark Blue Green #005249 ΔE 0.037
- Charcoal Grey #3C4142 ΔE 0.047
- Petrol #005F6A ΔE 0.055
Use #274E55 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.