#2B5366
Closest named color: Deep Teal (#00555A). oklch(42.1% 0.055 230.6), rgb(43, 83, 102).
Aa
White text reads best on this color (8.29:1).
About this color
#2B5366 is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.055 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Teal (#00555A), ΔE 0.036 away. White text reads best on it, at 8.29:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Deep Teal (#00555A) |
| Black text | 2.53:1 |
| White text | 8.29:1 |
Values
| HEX | #2B5366 |
| RGB | rgb(43, 83, 102) |
| HSL | hsl(199, 41%, 28%) |
| OKLCH | oklch(42.1% 0.055 230.6) |
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 #2B5366 | 8.29:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #2B5366 | 2.53:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #2B5366 text on white | 8.29:1 | AAA | Lc 88.5 | Fine for body text |
| #2B5366 text on black | 2.53:1 | Fails | Lc -13.7 | 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 800.
-
Step 50
50
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E4EBEF
oklch(93.6% 0.009 232.4)
-
Step 200
200
#CEDCE3
oklch(88.6% 0.018 229)
-
Step 300
300
#ACC5D2
oklch(80.9% 0.033 230.4)
-
Step 400
400
#80A7BB
oklch(70.7% 0.051 230.7)
-
Step 500
500
#5F91AA
oklch(63.1% 0.066 230.9)
-
Step 600
600
#447B96
oklch(55.6% 0.072 231.3)
-
Step 700
700
#356880
oklch(49.2% 0.067 230.6)
-
Step 800
800 (this color)
#2B5366
oklch(42.1% 0.055 230.6)
-
Step 900
900
#294654
oklch(37.7% 0.042 230.2)
-
Step 950
950
#182931
oklch(27% 0.027 229.2)
#2B5366 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) | #495267 | 0.038 |
| Deuteranopia (no green cones) | #414B66 | 0.035 |
| Tritanopia (no blue cones) | #005859 | 0.041 |
| Achromatopsia (no color) | #4E4E4E | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B5366
#2B5366
oklch(42.1% 0.055 230.6)
- #664531
#664531
oklch(42.2% 0.055 51.9)
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 #2B5366, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Teal #00555A ΔE 0.036
- Dark Slate Gray #2F4F4F ΔE 0.037
- Petrol #005F6A ΔE 0.040
- Dark Grey Blue #29465B ΔE 0.042
- YInMn Blue #415A77 ΔE 0.044
- Charcoal #264653 ΔE 0.048
- Deep Sea Blue #015482 ΔE 0.050
- Dark Teal #014D4E ΔE 0.054
Use #2B5366 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.