#259DBD
Closest named color: Turquoise Blue (#06B1C4). oklch(64.7% 0.11 220.9), rgb(37, 157, 189).
Aa
Black text reads best on this color (6.63:1).
About this color
#259DBD is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 65%, its chroma 0.110 and its hue 221°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.056 away. Black text reads best on it, at 6.63:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 6.63:1 |
| White text | 3.16:1 |
Values
| HEX | #259DBD |
| RGB | rgb(37, 157, 189) |
| HSL | hsl(193, 67%, 44%) |
| OKLCH | oklch(64.7% 0.11 220.9) |
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 #259DBD | 3.16:1 | AA large text | Lc -63.7 | Content text, not long reading |
| Black text on #259DBD | 6.63:1 | AA | Lc 45.7 | Large or bold text, headings |
| #259DBD text on white | 3.16:1 | AA large text | Lc 58.3 | Large or bold text, headings |
| #259DBD text on black | 6.63:1 | AA | Lc -43.4 | 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
#F0F7F9
oklch(97.1% 0.008 216.6)
-
Step 100
100
#DFECF1
oklch(93.5% 0.015 222.7)
-
Step 200
200
#C5DEE7
oklch(88.5% 0.029 221.4)
-
Step 300
300
#9BC9D9
oklch(80.9% 0.053 221.2)
-
Step 400
400
#5EADC6
oklch(70.7% 0.086 220.8)
-
Step 500
500 (this color)
#259DBD
oklch(64.7% 0.11 220.9)
-
Step 600
600
#00809D
oklch(55.6% 0.102 221.1)
-
Step 700
700
#006C84
oklch(49.2% 0.09 220.2)
-
Step 800
800
#00586D
oklch(42.6% 0.078 221.3)
-
Step 900
900
#00495B
oklch(37.6% 0.069 221.4)
-
Step 950
950
#052B36
oklch(26.9% 0.045 221.8)
#259DBD 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) | #8A99BF | 0.090 |
| Deuteranopia (no green cones) | #768ABD | 0.081 |
| Tritanopia (no blue cones) | #00A7A7 | 0.052 |
| Achromatopsia (no color) | #919191 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #259DBD
#259DBD
oklch(64.7% 0.11 220.9)
- #C67659
#C67659
oklch(64.6% 0.109 40.6)
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 #259DBD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.056
- Blue NCS #118AB2 ΔE 0.057
- Cadet Blue #5F9EA0 ΔE 0.057
- Faded Blue #658CBB ΔE 0.062
- Teal Green #0A9396 ΔE 0.063
- Sea #3C9992 ΔE 0.063
- Dusty Blue #5A86AD ΔE 0.068
- Greyblue #77A1B5 ΔE 0.068
Use #259DBD 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.