#51BFA7
Closest named color: Topaz (#13BBAF). oklch(73.4% 0.107 176.5), rgb(81, 191, 167).
Aa
Black text reads best on this color (9.36:1).
About this color
#51BFA7 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 73%, its chroma 0.107 and its hue 176°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.032 away. Black text reads best on it, at 9.36:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 9.36:1 |
| White text | 2.24:1 |
Values
| HEX | #51BFA7 |
| RGB | rgb(81, 191, 167) |
| HSL | hsl(167, 46%, 53%) |
| OKLCH | oklch(73.4% 0.107 176.5) |
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 #51BFA7 | 2.24:1 | Fails | Lc -48.8 | Large or bold text, headings |
| Black text on #51BFA7 | 9.36:1 | AAA | Lc 60.0 | Content text, not long reading |
| #51BFA7 text on white | 2.24:1 | Fails | Lc 44.0 | Non-text elements, placeholder text |
| #51BFA7 text on black | 9.36:1 | AAA | Lc -58.2 | 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
#C0E2D8
oklch(88.5% 0.038 175.7)
-
Step 300
300
#92CFBF
oklch(80.8% 0.067 176.4)
-
Step 400
400 (this color)
#51BFA7
oklch(73.4% 0.107 176.5)
-
Step 500
500
#00A087
oklch(63.1% 0.118 176.3)
-
Step 600
600
#008771
oklch(55.7% 0.104 175.8)
-
Step 700
700
#00715F
oklch(49% 0.091 176.5)
-
Step 800
800
#005D4E
oklch(42.8% 0.079 176.7)
-
Step 900
900
#004D40
oklch(37.6% 0.07 176.4)
-
Step 950
950
#002E26
oklch(26.9% 0.05 177.5)
#51BFA7 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) | #B8B4A6 | 0.112 |
| Deuteranopia (no green cones) | #A8A8A9 | 0.108 |
| Tritanopia (no blue cones) | #00C1B8 | 0.032 |
| Achromatopsia (no color) | #ADADAD | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51BFA7
#51BFA7
oklch(73.4% 0.107 176.5)
- #DF8CAB
#DF8CAB
oklch(73.4% 0.107 356.1)
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 #51BFA7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.032
- Greeny Blue #42B395 ΔE 0.041
- Medium Aquamarine #66CDAA ΔE 0.045
- Light Sea Green #20B2AA ΔE 0.050
- Green Blue #01C08D ΔE 0.052
- Greenblue #23C48B ΔE 0.054
- Pale Teal #82CBB2 ΔE 0.059
- Dark Sea Green #8FBC8F ΔE 0.060
Use #51BFA7 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.