#51AA99
Closest named color: Greeny Blue (#42B395). oklch(67.8% 0.09 179.2), rgb(81, 170, 153).
Aa
Black text reads best on this color (7.55:1).
About this color
#51AA99 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 68%, its chroma 0.090 and its hue 179°. 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 7.55:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Greeny Blue (#42B395) |
| Black text | 7.55:1 |
| White text | 2.77:1 |
Values
| HEX | #51AA99 |
| RGB | rgb(81, 170, 153) |
| HSL | hsl(169, 35%, 49%) |
| OKLCH | oklch(67.8% 0.09 179.2) |
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 #51AA99 | 2.77:1 | Fails | Lc -58.6 | Large or bold text, headings |
| Black text on #51AA99 | 7.55:1 | AAA | Lc 50.7 | Large or bold text, headings |
| #51AA99 text on white | 2.77:1 | Fails | Lc 53.4 | Large or bold text, headings |
| #51AA99 text on black | 7.55:1 | AAA | Lc -48.5 | 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
#DFEEEA
oklch(93.7% 0.017 178.3)
-
Step 200
200
#C4E0D9
oklch(88.4% 0.031 178.8)
-
Step 300
300
#9ACDC1
oklch(80.9% 0.056 178.7)
-
Step 400
400 (this color)
#51AA99
oklch(67.8% 0.09 179.2)
-
Step 500
500
#03A08B
oklch(63.2% 0.115 179)
-
Step 600
600
#008675
oklch(55.5% 0.101 179.7)
-
Step 700
700
#007162
oklch(49.1% 0.09 179.3)
-
Step 800
800
#005D50
oklch(42.8% 0.078 178.9)
-
Step 900
900
#004D42
oklch(37.6% 0.069 179)
-
Step 950
950
#022E27
oklch(27% 0.048 179.1)
#51AA99 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) | #A4A198 | 0.095 |
| Deuteranopia (no green cones) | #96979A | 0.090 |
| Tritanopia (no blue cones) | #21ACA5 | 0.028 |
| Achromatopsia (no color) | #9B9B9B | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51AA99
#51AA99
oklch(67.8% 0.09 179.2)
- #C58096
#C58096
oklch(67.7% 0.089 359.1)
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 #51AA99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greeny Blue #42B395 ΔE 0.030
- Light Sea Green #20B2AA ΔE 0.033
- Dull Teal #5F9E8F ΔE 0.033
- Cadet Blue #5F9EA0 ΔE 0.041
- Grey Teal #5E9B8A ΔE 0.042
- Tea #65AB7C ΔE 0.043
- Persian Green #2A9D8F ΔE 0.050
- Topaz #13BBAF ΔE 0.050
Use #51AA99 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.