#999FBB
Closest named color: Cool Steel (#97A7B3). oklch(70.7% 0.041 275.8), rgb(153, 159, 187).
Aa
Black text reads best on this color (8.03:1).
About this color
#999FBB is a medium-light, muted blue. In OKLCH its lightness is 71%, its chroma 0.041 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Steel (#97A7B3), ΔE 0.028 away. Black text reads best on it, at 8.03:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Cool Steel (#97A7B3) |
| Black text | 8.03:1 |
| White text | 2.61:1 |
Values
| HEX | #999FBB |
| RGB | rgb(153, 159, 187) |
| HSL | hsl(229, 20%, 67%) |
| OKLCH | oklch(70.7% 0.041 275.8) |
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 #999FBB | 2.61:1 | Fails | Lc -56.2 | Large or bold text, headings |
| Black text on #999FBB | 8.03:1 | AAA | Lc 53.0 | Large or bold text, headings |
| #999FBB text on white | 2.61:1 | Fails | Lc 51.0 | Large or bold text, headings |
| #999FBB text on black | 8.03:1 | AAA | Lc -50.9 | 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
#D6D9E3
oklch(88.6% 0.014 272.7)
-
Step 300
300
#BCC0D2
oklch(81% 0.026 275.8)
-
Step 400
400 (this color)
#999FBB
oklch(70.7% 0.041 275.8)
-
Step 500
500
#8087AA
oklch(63% 0.053 275.9)
-
Step 600
600
#6A7195
oklch(55.7% 0.057 275.9)
-
Step 700
700
#585E7F
oklch(49% 0.053 276.3)
-
Step 800
800
#484D67
oklch(42.6% 0.044 275.9)
-
Step 900
900
#3C4054
oklch(37.6% 0.035 275.8)
-
Step 950
950
#232631
oklch(27% 0.021 273)
#999FBB 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) | #97A1BC | 0.006 |
| Deuteranopia (no green cones) | #959FBA | 0.006 |
| Tritanopia (no blue cones) | #91A4A8 | 0.037 |
| Achromatopsia (no color) | #A0A0A0 | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #999FBB
#999FBB
oklch(70.7% 0.041 275.8)
- #A8A184
#A8A184
oklch(70.7% 0.041 96)
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 #999FBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Steel #97A7B3 ΔE 0.028
- Bluey Grey #89A0B0 ΔE 0.029
- Cool Gray #8D99AE ΔE 0.029
- Bluegrey #85A3B2 ΔE 0.033
- Cool Grey #95A3A6 ΔE 0.037
- Greyblue #77A1B5 ΔE 0.045
- Dark Gray #A9A9A9 ΔE 0.050
- Pewter #96A8A1 ΔE 0.053
Use #999FBB 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.