#51BBA2
Closest named color: Greeny Blue (#42B395). oklch(72.3% 0.105 175.2), rgb(81, 187, 162).
Aa
Black text reads best on this color (8.97:1).
About this color
#51BBA2 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 72%, its chroma 0.105 and its hue 175°. Its hue sits on the cool side of the wheel. The nearest named color is Greeny Blue (#42B395), ΔE 0.030 away. Black text reads best on it, at 8.97:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Greeny Blue (#42B395) |
| Black text | 8.97:1 |
| White text | 2.33:1 |
Values
| HEX | #51BBA2 |
| RGB | rgb(81, 187, 162) |
| HSL | hsl(166, 44%, 53%) |
| OKLCH | oklch(72.3% 0.105 175.2) |
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 #51BBA2 | 2.33:1 | Fails | Lc -50.8 | Large or bold text, headings |
| Black text on #51BBA2 | 8.97:1 | AAA | Lc 58.1 | Large or bold text, headings |
| #51BBA2 text on white | 2.33:1 | Fails | Lc 45.9 | Large or bold text, headings |
| #51BBA2 text on black | 8.97:1 | AAA | Lc -56.2 | 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
#DEEEE9
oklch(93.6% 0.018 175.3)
-
Step 200
200
#C1E1D8
oklch(88.4% 0.036 176.6)
-
Step 300
300
#93CFBE
oklch(80.9% 0.066 175.1)
-
Step 400
400 (this color)
#51BBA2
oklch(72.3% 0.105 175.2)
-
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)
#51BBA2 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) | #B5B0A1 | 0.110 |
| Deuteranopia (no green cones) | #A5A5A4 | 0.105 |
| Tritanopia (no blue cones) | #02BDB4 | 0.033 |
| Achromatopsia (no color) | #A9A9A9 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51BBA2
#51BBA2
oklch(72.3% 0.105 175.2)
- #DA89A8
#DA89A8
oklch(72.3% 0.106 355.5)
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 #51BBA2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greeny Blue #42B395 ΔE 0.030
- Topaz #13BBAF ΔE 0.030
- Light Sea Green #20B2AA ΔE 0.042
- Green Blue #01C08D ΔE 0.049
- Greenblue #23C48B ΔE 0.054
- Medium Aquamarine #66CDAA ΔE 0.055
- Tea #65AB7C ΔE 0.056
- Muted Teal #90B494 ΔE 0.060
Use #51BBA2 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.