#2591AB
Closest named color: Blue NCS (#118AB2). oklch(61% 0.1 218.3), rgb(37, 145, 171).
Aa
Black text reads best on this color (5.71:1).
About this color
#2591AB is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 61%, its chroma 0.100 and its hue 218°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.028 away. Black text reads best on it, at 5.71:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.71:1 |
| White text | 3.67:1 |
Values
| HEX | #2591AB |
| RGB | rgb(37, 145, 171) |
| HSL | hsl(192, 64%, 41%) |
| OKLCH | oklch(61% 0.1 218.3) |
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 #2591AB | 3.67:1 | AA large text | Lc -69.4 | Content text, not long reading |
| Black text on #2591AB | 5.71:1 | AA | Lc 40.1 | Non-text elements, placeholder text |
| #2591AB text on white | 3.67:1 | AA large text | Lc 63.9 | Content text, not long reading |
| #2591AB text on black | 5.71:1 | AA | Lc -37.7 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F1F7F8
oklch(97.2% 0.007 208.8)
-
Step 100
100
#E0ECF0
oklch(93.5% 0.014 219.6)
-
Step 200
200
#C6DEE5
oklch(88.5% 0.027 217.2)
-
Step 300
300
#9EC9D6
oklch(80.9% 0.049 218.2)
-
Step 400
400
#64ADC1
oklch(70.7% 0.078 217.5)
-
Step 500
500 (this color)
#2591AB
oklch(61% 0.1 218.3)
-
Step 600
600
#00819A
oklch(55.7% 0.1 217.7)
-
Step 700
700
#006C82
oklch(49.1% 0.088 218.4)
-
Step 800
800
#00596B
oklch(42.8% 0.077 217.7)
-
Step 900
900
#064A59
oklch(37.8% 0.065 218)
-
Step 950
950
#092B34
oklch(27% 0.041 219)
#2591AB 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) | #808DAC | 0.085 |
| Deuteranopia (no green cones) | #6F80AB | 0.076 |
| Tritanopia (no blue cones) | #009A99 | 0.045 |
| Achromatopsia (no color) | #858585 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2591AB
#2591AB
oklch(61% 0.1 218.3)
- #B66D56
#B66D56
oklch(61% 0.1 38.2)
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 #2591AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.028
- Teal Blue #01889F ΔE 0.033
- Teal Green #0A9396 ΔE 0.037
- Dusty Blue #5A86AD ΔE 0.049
- Off Blue #5684AE ΔE 0.050
- Cool Blue #4984B8 ΔE 0.052
- Steel Blue #4682B4 ΔE 0.052
- Dark Cyan #008B8B ΔE 0.052
Use #2591AB 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.