#999FBF
Closest named color: Cool Steel (#97A7B3). oklch(70.9% 0.047 276.8), rgb(153, 159, 191).
Aa
Black text reads best on this color (8.06:1).
About this color
#999FBF is a medium-light, muted blue. In OKLCH its lightness is 71%, its chroma 0.047 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Steel (#97A7B3), ΔE 0.033 away. Black text reads best on it, at 8.06:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | muted (0.047) |
| Temperature | cool |
| Nearest name | Cool Steel (#97A7B3) |
| Black text | 8.06:1 |
| White text | 2.60:1 |
Values
| HEX | #999FBF |
| RGB | rgb(153, 159, 191) |
| HSL | hsl(231, 23%, 67%) |
| OKLCH | oklch(70.9% 0.047 276.8) |
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 #999FBF | 2.60:1 | Fails | Lc -56.0 | Large or bold text, headings |
| Black text on #999FBF | 8.06:1 | AAA | Lc 53.2 | Large or bold text, headings |
| #999FBF text on white | 2.60:1 | Fails | Lc 50.8 | Large or bold text, headings |
| #999FBF text on black | 8.06:1 | AAA | Lc -51.1 | 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
#E8E9F0
oklch(93.5% 0.009 279.7)
-
Step 200
200
#D6D8E4
oklch(88.4% 0.017 278.5)
-
Step 300
300
#BBBFD4
oklch(80.8% 0.03 277.1)
-
Step 400
400 (this color)
#999FBF
oklch(70.9% 0.047 276.8)
-
Step 500
500
#8087AE
oklch(63.2% 0.059 276.6)
-
Step 600
600
#69709A
oklch(55.6% 0.066 276.7)
-
Step 700
700
#585E83
oklch(49.2% 0.06 276.9)
-
Step 800
800
#484D6B
oklch(42.8% 0.05 276.8)
-
Step 900
900
#3C4057
oklch(37.8% 0.04 276.7)
-
Step 950
950
#232533
oklch(26.9% 0.026 278.2)
#999FBF 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) | #96A2C0 | 0.008 |
| Deuteranopia (no green cones) | #949FBE | 0.007 |
| Tritanopia (no blue cones) | #90A5AA | 0.042 |
| Achromatopsia (no color) | #A0A0A0 | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #999FBF
#999FBF
oklch(70.9% 0.047 276.8)
- #A9A280
#A9A280
oklch(70.9% 0.048 97.7)
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 #999FBF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Steel #97A7B3 ΔE 0.033
- Cool Gray #8D99AE ΔE 0.033
- Bluey Grey #89A0B0 ΔE 0.033
- Bluegrey #85A3B2 ΔE 0.037
- Cool Grey #95A3A6 ΔE 0.043
- Greyblue #77A1B5 ΔE 0.048
- Dark Gray #A9A9A9 ΔE 0.054
- Pewter #96A8A1 ΔE 0.058
Use #999FBF 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.