#5B99A3
Closest named color: Cadet Blue (#5F9EA0). oklch(64.5% 0.066 208.8), rgb(91, 153, 163).
Aa
Black text reads best on this color (6.53:1).
About this color
#5B99A3 is a medium-light, muted teal or cyan. In OKLCH its lightness is 64%, its chroma 0.066 and its hue 209°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.018 away. Black text reads best on it, at 6.53:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (64%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.53:1 |
| White text | 3.21:1 |
Values
| HEX | #5B99A3 |
| RGB | rgb(91, 153, 163) |
| HSL | hsl(188, 28%, 50%) |
| OKLCH | oklch(64.5% 0.066 208.8) |
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 #5B99A3 | 3.21:1 | AA large text | Lc -64.7 | Content text, not long reading |
| Black text on #5B99A3 | 6.53:1 | AA | Lc 44.8 | Non-text elements, placeholder text |
| #5B99A3 text on white | 3.21:1 | AA large text | Lc 59.3 | Large or bold text, headings |
| #5B99A3 text on black | 6.53:1 | AA | Lc -42.4 | 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
#CCDDDF
oklch(88.5% 0.018 205.3)
-
Step 300
300
#AAC7CC
oklch(81% 0.032 209.2)
-
Step 400
400
#7BAAB2
oklch(70.7% 0.051 209.1)
-
Step 500
500 (this color)
#5B99A3
oklch(64.5% 0.066 208.8)
-
Step 600
600
#397F8A
oklch(55.6% 0.072 209.1)
-
Step 700
700
#2B6B75
oklch(49.1% 0.066 209.2)
-
Step 800
800
#25575F
oklch(42.6% 0.055 209.3)
-
Step 900
900
#24484E
oklch(37.7% 0.043 209.4)
-
Step 950
950
#162A2E
oklch(27% 0.027 211.7)
#5B99A3 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) | #8F95A4 | 0.063 |
| Deuteranopia (no green cones) | #848CA3 | 0.058 |
| Tritanopia (no blue cones) | #399E9C | 0.034 |
| Achromatopsia (no color) | #8F8F8F | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B99A3
#5B99A3
oklch(64.5% 0.066 208.8)
- #B27F77
#B27F77
oklch(64.5% 0.065 29)
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 #5B99A3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.018
- Dull Teal #5F9E8F ΔE 0.038
- Sea #3C9992 ΔE 0.040
- Grey Teal #5E9B8A ΔE 0.040
- Blue Grey #758DA3 ΔE 0.043
- Greyblue #77A1B5 ΔE 0.047
- Silver Lake Blue #778DA9 ΔE 0.048
- Dusty Teal #4C9085 ΔE 0.051
Use #5B99A3 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.