#999FB9
Closest named color: Cool Steel (#97A7B3). oklch(70.6% 0.039 275.1), rgb(153, 159, 185).
Aa
Black text reads best on this color (8.01:1).
About this color
#999FB9 is a medium-light, muted blue. In OKLCH its lightness is 71%, its chroma 0.039 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Steel (#97A7B3), ΔE 0.027 away. Black text reads best on it, at 8.01:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Cool Steel (#97A7B3) |
| Black text | 8.01:1 |
| White text | 2.62:1 |
Values
| HEX | #999FB9 |
| RGB | rgb(153, 159, 185) |
| HSL | hsl(229, 19%, 66%) |
| OKLCH | oklch(70.6% 0.039 275.1) |
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 #999FB9 | 2.62:1 | Fails | Lc -56.3 | Large or bold text, headings |
| Black text on #999FB9 | 8.01:1 | AAA | Lc 52.9 | Large or bold text, headings |
| #999FB9 text on white | 2.62:1 | Fails | Lc 51.1 | Large or bold text, headings |
| #999FB9 text on black | 8.01:1 | AAA | Lc -50.8 | 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
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E8E9EF
oklch(93.5% 0.008 278.6)
-
Step 200
200
#D6D9E2
oklch(88.6% 0.013 271.3)
-
Step 300
300
#BCC0D1
oklch(81% 0.024 275.3)
-
Step 400
400 (this color)
#999FB9
oklch(70.6% 0.039 275.1)
-
Step 500
500
#8088A8
oklch(63.2% 0.049 273.9)
-
Step 600
600
#6A7193
oklch(55.6% 0.054 275.5)
-
Step 700
700
#585F7D
oklch(49.1% 0.049 274.3)
-
Step 800
800
#484D66
oklch(42.6% 0.042 275.7)
-
Step 900
900
#3C4053
oklch(37.6% 0.033 275.4)
-
Step 950
950
#232631
oklch(27% 0.021 273)
#999FB9 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) | #98A1BA | 0.005 |
| Deuteranopia (no green cones) | #969FB8 | 0.005 |
| Tritanopia (no blue cones) | #92A4A7 | 0.036 |
| Achromatopsia (no color) | #A0A0A0 | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #999FB9
#999FB9
oklch(70.6% 0.039 275.1)
- #A8A186
#A8A186
oklch(70.8% 0.039 95.1)
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 #999FB9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Steel #97A7B3 ΔE 0.027
- Bluey Grey #89A0B0 ΔE 0.027
- Cool Gray #8D99AE ΔE 0.028
- Bluegrey #85A3B2 ΔE 0.031
- Cool Grey #95A3A6 ΔE 0.034
- Greyblue #77A1B5 ΔE 0.044
- Dark Gray #A9A9A9 ΔE 0.048
- Pewter #96A8A1 ΔE 0.050
Use #999FB9 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.