#599EA9
Closest named color: Cadet Blue (#5F9EA0). oklch(65.8% 0.072 208.8), rgb(89, 158, 169).
Aa
Black text reads best on this color (6.88:1).
About this color
#599EA9 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.072 and its hue 209°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.014 away. Black text reads best on it, at 6.88:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.88:1 |
| White text | 3.04:1 |
Values
| HEX | #599EA9 |
| RGB | rgb(89, 158, 169) |
| HSL | hsl(188, 32%, 51%) |
| OKLCH | oklch(65.8% 0.072 208.8) |
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 #599EA9 | 3.04:1 | AA large text | Lc -62.6 | Content text, not long reading |
| Black text on #599EA9 | 6.88:1 | AA | Lc 46.9 | Large or bold text, headings |
| #599EA9 text on white | 3.04:1 | AA large text | Lc 57.2 | Large or bold text, headings |
| #599EA9 text on black | 6.88:1 | AA | Lc -44.6 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E3ECED
oklch(93.7% 0.01 204.9)
-
Step 200
200
#CBDDE0
oklch(88.5% 0.02 208.8)
-
Step 300
300
#A7C7CD
oklch(80.8% 0.035 210.2)
-
Step 400
400
#77ABB3
oklch(70.8% 0.056 208)
-
Step 500
500 (this color)
#599EA9
oklch(65.8% 0.072 208.8)
-
Step 600
600
#31808C
oklch(55.7% 0.078 209.1)
-
Step 700
700
#226C77
oklch(49.1% 0.073 209.2)
-
Step 800
800
#1F5860
oklch(42.7% 0.06 208)
-
Step 900
900
#20484F
oklch(37.6% 0.046 210.4)
-
Step 950
950
#142A2E
oklch(26.9% 0.029 210.5)
#599EA9 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) | #9399AA | 0.068 |
| Deuteranopia (no green cones) | #878FA9 | 0.064 |
| Tritanopia (no blue cones) | #2FA4A1 | 0.038 |
| Achromatopsia (no color) | #949494 | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #599EA9
#599EA9
oklch(65.8% 0.072 208.8)
- #B98179
#B98179
oklch(65.7% 0.071 28.2)
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 #599EA9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.014
- Dull Teal #5F9E8F ΔE 0.039
- Greyblue #77A1B5 ΔE 0.039
- Grey Teal #5E9B8A ΔE 0.044
- Sea #3C9992 ΔE 0.046
- Blue Grey #758DA3 ΔE 0.052
- Bluegrey #85A3B2 ΔE 0.055
- Persian Green #2A9D8F ΔE 0.056
Use #599EA9 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.