#999FB4
Closest named color: Cool Steel (#97A7B3). oklch(70.5% 0.031 272.9), rgb(153, 159, 180).
Aa
Black text reads best on this color (7.97:1).
About this color
#999FB4 is a medium-light, muted blue. In OKLCH its lightness is 70%, its chroma 0.031 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Steel (#97A7B3), ΔE 0.023 away. Black text reads best on it, at 7.97:1.
| Hue family | Blues |
| Lightness | medium-light (70%) |
| Chroma | muted (0.031) |
| Temperature | cool |
| Nearest name | Cool Steel (#97A7B3) |
| Black text | 7.97:1 |
| White text | 2.63:1 |
Values
| HEX | #999FB4 |
| RGB | rgb(153, 159, 180) |
| HSL | hsl(227, 15%, 65%) |
| OKLCH | oklch(70.5% 0.031 272.9) |
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 #999FB4 | 2.63:1 | Fails | Lc -56.5 | Large or bold text, headings |
| Black text on #999FB4 | 7.97:1 | AAA | Lc 52.7 | Large or bold text, headings |
| #999FB4 text on white | 2.63:1 | Fails | Lc 51.3 | Large or bold text, headings |
| #999FB4 text on black | 7.97:1 | AAA | Lc -50.6 | 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
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#E8EAEE
oklch(93.7% 0.006 264.5)
-
Step 200
200
#D6D9E1
oklch(88.5% 0.011 269.5)
-
Step 300
300
#BCC0CE
oklch(80.9% 0.02 273.2)
-
Step 400
400 (this color)
#999FB4
oklch(70.5% 0.031 272.9)
-
Step 500
500
#8188A2
oklch(63% 0.04 273.4)
-
Step 600
600
#6B728D
oklch(55.6% 0.043 273.6)
-
Step 700
700
#596078
oklch(49.2% 0.039 272.2)
-
Step 800
800
#494E62
oklch(42.7% 0.034 273.9)
-
Step 900
900
#3D4150
oklch(37.8% 0.026 273.4)
-
Step 950
950
#24262F
oklch(27% 0.017 275.4)
#999FB4 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) | #99A1B5 | 0.005 |
| Deuteranopia (no green cones) | #979EB3 | 0.004 |
| Tritanopia (no blue cones) | #93A3A6 | 0.028 |
| Achromatopsia (no color) | #9F9F9F | 0.031 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #999FB4
#999FB4
oklch(70.5% 0.031 272.9)
- #A6A08A
#A6A08A
oklch(70.5% 0.032 94.5)
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 #999FB4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Steel #97A7B3 ΔE 0.023
- Bluey Grey #89A0B0 ΔE 0.023
- Cool Gray #8D99AE ΔE 0.025
- Cool Grey #95A3A6 ΔE 0.027
- Bluegrey #85A3B2 ΔE 0.028
- Greyblue #77A1B5 ΔE 0.043
- Dark Gray #A9A9A9 ΔE 0.044
- Pewter #96A8A1 ΔE 0.044
Use #999FB4 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.