#258B88
Closest named color: Dark Cyan (#008B8B). oklch(58% 0.09 192), rgb(37, 139, 136).
Aa
Black text reads best on this color (5.12:1).
About this color
#258B88 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 58%, its chroma 0.090 and its hue 192°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Cyan (#008B8B), ΔE 0.011 away. Black text reads best on it, at 5.12:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Dark Cyan (#008B8B) |
| Black text | 5.12:1 |
| White text | 4.09:1 |
Values
| HEX | #258B88 |
| RGB | rgb(37, 139, 136) |
| HSL | hsl(178, 58%, 35%) |
| OKLCH | oklch(58% 0.09 192) |
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 #258B88 | 4.09:1 | AA large text | Lc -73.3 | Content text, not long reading |
| Black text on #258B88 | 5.12:1 | AA | Lc 36.3 | Non-text elements, placeholder text |
| #258B88 text on white | 4.09:1 | AA large text | Lc 67.8 | Content text, not long reading |
| #258B88 text on black | 5.12:1 | AA | Lc -33.9 | 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 600.
-
Step 50
50
#F2F7F6
oklch(97.2% 0.005 183)
-
Step 100
100
#E2ECEC
oklch(93.6% 0.011 197)
-
Step 200
200
#C9DEDD
oklch(88.5% 0.022 193.3)
-
Step 300
300
#A4C9C7
oklch(80.9% 0.039 192.3)
-
Step 400
400
#6FAEAB
oklch(70.7% 0.065 191.9)
-
Step 500
500
#449996
oklch(63% 0.082 192.1)
-
Step 600
600 (this color)
#258B88
oklch(58% 0.09 192)
-
Step 700
700
#046F6D
oklch(49% 0.083 192.6)
-
Step 800
800
#0E5B59
oklch(42.8% 0.069 192.1)
-
Step 900
900
#174B49
oklch(37.8% 0.054 191.5)
-
Step 950
950
#102C2B
oklch(27.1% 0.034 192.2)
#258B88 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) | #828488 | 0.094 |
| Deuteranopia (no green cones) | #737989 | 0.088 |
| Tritanopia (no blue cones) | #008F8A | 0.014 |
| Achromatopsia (no color) | #7D7D7D | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #258B88
#258B88
oklch(58% 0.09 192)
- #A8636C
#A8636C
oklch(57.9% 0.09 11.8)
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 #258B88, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Cyan #008B8B ΔE 0.011
- Teal Green #0A9396 ΔE 0.026
- Dusty Teal #4C9085 ΔE 0.034
- Teal #008080 ΔE 0.038
- Teal Blue #01889F ΔE 0.040
- Sea #3C9992 ΔE 0.046
- Blue Green #0F9B8E ΔE 0.046
- Persian Green #2A9D8F ΔE 0.054
Use #258B88 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.