#237C78
Closest named color: Bluegreen (#017A79). oklch(53.5% 0.081 190.6), rgb(35, 124, 120).
Aa
White text reads best on this color (4.96:1).
About this color
#237C78 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 53%, its chroma 0.081 and its hue 191°. Its hue sits on the cool side of the wheel. The nearest named color is Bluegreen (#017A79), ΔE 0.014 away. White text reads best on it, at 4.96:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Bluegreen (#017A79) |
| Black text | 4.22:1 |
| White text | 4.96:1 |
Values
| HEX | #237C78 |
| RGB | rgb(35, 124, 120) |
| HSL | hsl(177, 56%, 31%) |
| OKLCH | oklch(53.5% 0.081 190.6) |
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 #237C78 | 4.96:1 | AA | Lc -79.5 | Fine for body text |
| Black text on #237C78 | 4.22:1 | AA large text | Lc 30.0 | Non-text elements, placeholder text |
| #237C78 text on white | 4.96:1 | AA | Lc 74.1 | Content text, not long reading |
| #237C78 text on black | 4.22:1 | AA large text | Lc -27.6 | Dividers and decoration only |
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
#F2F6F6
oklch(97% 0.004 197.1)
-
Step 100
100
#E2ECEB
oklch(93.5% 0.011 189.8)
-
Step 200
200
#CBDEDC
oklch(88.6% 0.02 189.2)
-
Step 300
300
#A7C9C6
oklch(81% 0.037 189.9)
-
Step 400
400
#75ADA9
oklch(70.8% 0.059 190.3)
-
Step 500
500
#4D9894
oklch(63.1% 0.075 190.9)
-
Step 600
600 (this color)
#237C78
oklch(53.5% 0.081 190.6)
-
Step 700
700
#1C6E6B
oklch(49% 0.076 191.3)
-
Step 800
800
#1B5A57
oklch(42.7% 0.063 190.5)
-
Step 900
900
#1E4A48
oklch(37.8% 0.049 191.3)
-
Step 950
950
#132B2A
oklch(26.9% 0.03 192)
#237C78 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) | #747578 | 0.085 |
| Deuteranopia (no green cones) | #676C79 | 0.080 |
| Tritanopia (no blue cones) | #007F7B | 0.012 |
| Achromatopsia (no color) | #707070 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #237C78
#237C78
oklch(53.5% 0.081 190.6)
- #965962
#965962
oklch(53.6% 0.081 10.6)
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 #237C78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bluegreen #017A79 ΔE 0.014
- Teal #008080 ΔE 0.016
- Deep Aqua #08787F ΔE 0.022
- Deep Turquoise #017374 ΔE 0.032
- Dark Aquamarine #017371 ΔE 0.033
- Ocean #017B92 ΔE 0.043
- Dark Cyan #008B8B ΔE 0.046
- Sea Blue #047495 ΔE 0.060
Use #237C78 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.