#999FB8
Closest named color: Cool Steel (#97A7B3). oklch(70.6% 0.037 274.8), rgb(153, 159, 184).
Aa
Black text reads best on this color (8.00:1).
About this color
#999FB8 is a medium-light, muted blue. In OKLCH its lightness is 71%, its chroma 0.037 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Steel (#97A7B3), ΔE 0.026 away. Black text reads best on it, at 8.00:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | muted (0.037) |
| Temperature | cool |
| Nearest name | Cool Steel (#97A7B3) |
| Black text | 8.00:1 |
| White text | 2.62:1 |
Values
| HEX | #999FB8 |
| RGB | rgb(153, 159, 184) |
| HSL | hsl(228, 18%, 66%) |
| OKLCH | oklch(70.6% 0.037 274.8) |
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 #999FB8 | 2.62:1 | Fails | Lc -56.3 | Large or bold text, headings |
| Black text on #999FB8 | 8.00:1 | AAA | Lc 52.9 | Large or bold text, headings |
| #999FB8 text on white | 2.62:1 | Fails | Lc 51.2 | Large or bold text, headings |
| #999FB8 text on black | 8.00:1 | AAA | Lc -50.7 | 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
#D6D9E2
oklch(88.6% 0.013 271.3)
-
Step 300
300
#BCC0D0
oklch(81% 0.023 274.7)
-
Step 400
400 (this color)
#999FB8
oklch(70.6% 0.037 274.8)
-
Step 500
500
#8188A7
oklch(63.2% 0.047 275)
-
Step 600
600
#6A7192
oklch(55.5% 0.052 275.3)
-
Step 700
700
#585F7C
oklch(49.1% 0.047 274)
-
Step 800
800
#484E65
oklch(42.8% 0.039 273.3)
-
Step 900
900
#3C4152
oklch(37.8% 0.03 272.1)
-
Step 950
950
#232630
oklch(27% 0.019 272)
#999FB8 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) | #98A1B9 | 0.005 |
| Deuteranopia (no green cones) | #969FB7 | 0.005 |
| Tritanopia (no blue cones) | #92A3A7 | 0.033 |
| Achromatopsia (no color) | #A0A0A0 | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #999FB8
#999FB8
oklch(70.6% 0.037 274.8)
- #A7A087
#A7A087
oklch(70.5% 0.036 94.2)
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 #999FB8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Steel #97A7B3 ΔE 0.026
- Bluey Grey #89A0B0 ΔE 0.026
- Cool Gray #8D99AE ΔE 0.027
- Bluegrey #85A3B2 ΔE 0.031
- Cool Grey #95A3A6 ΔE 0.033
- Greyblue #77A1B5 ΔE 0.044
- Dark Gray #A9A9A9 ΔE 0.047
- Pewter #96A8A1 ΔE 0.049
Use #999FB8 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.