#258C99
Closest named color: Teal Blue (#01889F). oklch(58.9% 0.091 207.6), rgb(37, 140, 153).
Aa
Black text reads best on this color (5.28:1).
About this color
#258C99 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 59%, its chroma 0.091 and its hue 208°. Its hue sits on the cool side of the wheel. The nearest named color is Teal Blue (#01889F), ΔE 0.021 away. Black text reads best on it, at 5.28:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Teal Blue (#01889F) |
| Black text | 5.28:1 |
| White text | 3.96:1 |
Values
| HEX | #258C99 |
| RGB | rgb(37, 140, 153) |
| HSL | hsl(187, 61%, 37%) |
| OKLCH | oklch(58.9% 0.091 207.6) |
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 #258C99 | 3.96:1 | AA large text | Lc -72.2 | Content text, not long reading |
| Black text on #258C99 | 5.28:1 | AA | Lc 37.4 | Non-text elements, placeholder text |
| #258C99 text on white | 3.96:1 | AA large text | Lc 66.7 | Content text, not long reading |
| #258C99 text on black | 5.28:1 | AA | Lc -35.0 | 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
#F1F6F7
oklch(97% 0.005 211)
-
Step 100
100
#E1ECEE
oklch(93.5% 0.012 209.8)
-
Step 200
200
#C9DEE1
oklch(88.6% 0.023 207.1)
-
Step 300
300
#A3C9CE
oklch(81% 0.041 206.2)
-
Step 400
400
#6EADB6
oklch(70.8% 0.066 207.2)
-
Step 500
500
#4198A4
oklch(63.2% 0.084 207.6)
-
Step 600
600 (this color)
#258C99
oklch(58.9% 0.091 207.6)
-
Step 700
700
#006E79
oklch(49.2% 0.084 206.9)
-
Step 800
800
#0A5963
oklch(42.6% 0.07 208.6)
-
Step 900
900
#154A51
oklch(37.8% 0.055 207.6)
-
Step 950
950
#0F2B2F
oklch(26.9% 0.034 207.9)
#258C99 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) | #7F869A | 0.088 |
| Deuteranopia (no green cones) | #6F7B99 | 0.080 |
| Tritanopia (no blue cones) | #009390 | 0.030 |
| Achromatopsia (no color) | #808080 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #258C99
#258C99
oklch(58.9% 0.091 207.6)
- #AD675F
#AD675F
oklch(58.9% 0.092 27.2)
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 #258C99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Teal Blue #01889F ΔE 0.021
- Teal Green #0A9396 ΔE 0.024
- Dark Cyan #008B8B ΔE 0.026
- Blue NCS #118AB2 ΔE 0.041
- Dusty Teal #4C9085 ΔE 0.044
- Sea #3C9992 ΔE 0.048
- Teal #008080 ΔE 0.051
- Blue Green #0F9B8E ΔE 0.053
Use #258C99 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.