#51BDA4
Closest named color: Topaz (#13BBAF). oklch(72.8% 0.106 175.5), rgb(81, 189, 164).
Aa
Black text reads best on this color (9.16:1).
About this color
#51BDA4 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 73%, its chroma 0.106 and its hue 176°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.031 away. Black text reads best on it, at 9.16:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 9.16:1 |
| White text | 2.29:1 |
Values
| HEX | #51BDA4 |
| RGB | rgb(81, 189, 164) |
| HSL | hsl(166, 45%, 53%) |
| OKLCH | oklch(72.8% 0.106 175.5) |
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 #51BDA4 | 2.29:1 | Fails | Lc -49.8 | Large or bold text, headings |
| Black text on #51BDA4 | 9.16:1 | AAA | Lc 59.0 | Large or bold text, headings |
| #51BDA4 text on white | 2.29:1 | Fails | Lc 44.9 | Non-text elements, placeholder text |
| #51BDA4 text on black | 9.16:1 | AAA | Lc -57.2 | Large or bold text, headings |
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 400.
-
Step 50
50
#F0F7F5
oklch(97% 0.008 177.3)
-
Step 100
100
#DDEEE9
oklch(93.5% 0.019 176.4)
-
Step 200
200
#C1E2D8
oklch(88.6% 0.037 175.2)
-
Step 300
300
#93CFBE
oklch(80.9% 0.066 175.1)
-
Step 400
400 (this color)
#51BDA4
oklch(72.8% 0.106 175.5)
-
Step 500
500
#00A086
oklch(63% 0.118 175.6)
-
Step 600
600
#008770
oklch(55.7% 0.105 175.1)
-
Step 700
700
#00715E
oklch(49% 0.092 175.6)
-
Step 800
800
#005D4D
oklch(42.7% 0.08 175.6)
-
Step 900
900
#004E40
oklch(37.9% 0.071 175.3)
-
Step 950
950
#002E25
oklch(26.9% 0.05 175.6)
#51BDA4 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) | #B7B2A3 | 0.112 |
| Deuteranopia (no green cones) | #A6A6A6 | 0.106 |
| Tritanopia (no blue cones) | #00BFB6 | 0.033 |
| Achromatopsia (no color) | #ABABAB | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51BDA4
#51BDA4
oklch(72.8% 0.106 175.5)
- #DC8BAA
#DC8BAA
oklch(72.9% 0.105 355.5)
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 #51BDA4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.031
- Greeny Blue #42B395 ΔE 0.035
- Light Sea Green #20B2AA ΔE 0.046
- Green Blue #01C08D ΔE 0.050
- Medium Aquamarine #66CDAA ΔE 0.050
- Greenblue #23C48B ΔE 0.053
- Dark Sea Green #8FBC8F ΔE 0.060
- Muted Teal #90B494 ΔE 0.060
Use #51BDA4 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.