#91B1CB
Closest named color: Light Grey Blue (#9DBCD4). oklch(74.6% 0.051 243), rgb(145, 177, 203).
Aa
Black text reads best on this color (9.35:1).
About this color
#91B1CB is a medium-light, muted blue. In OKLCH its lightness is 75%, its chroma 0.051 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Light Grey Blue (#9DBCD4), ΔE 0.035 away. Black text reads best on it, at 9.35:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Light Grey Blue (#9DBCD4) |
| Black text | 9.35:1 |
| White text | 2.24:1 |
Values
| HEX | #91B1CB |
| RGB | rgb(145, 177, 203) |
| HSL | hsl(207, 36%, 68%) |
| OKLCH | oklch(74.6% 0.051 243) |
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 #91B1CB | 2.24:1 | Fails | Lc -49.0 | Large or bold text, headings |
| Black text on #91B1CB | 9.35:1 | AAA | Lc 59.7 | Large or bold text, headings |
| #91B1CB text on white | 2.24:1 | Fails | Lc 44.2 | Non-text elements, placeholder text |
| #91B1CB text on black | 9.35:1 | AAA | Lc -57.9 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBF0
oklch(93.7% 0.009 242.8)
-
Step 200
200
#CFDBE4
oklch(88.5% 0.018 240)
-
Step 300
300
#AFC4D4
oklch(81% 0.032 240.7)
-
Step 400
400 (this color)
#91B1CB
oklch(74.6% 0.051 243)
-
Step 500
500
#668EAE
oklch(63% 0.066 243.2)
-
Step 600
600
#4D789A
oklch(55.5% 0.071 243.4)
-
Step 700
700
#3E6584
oklch(49.1% 0.067 243.7)
-
Step 800
800
#33536B
oklch(42.8% 0.055 242.1)
-
Step 900
900
#2D4457
oklch(37.6% 0.044 244.2)
-
Step 950
950
#1B2833
oklch(27% 0.027 244.6)
#91B1CB 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) | #A6B1CC | 0.027 |
| Deuteranopia (no green cones) | #9FAACB | 0.025 |
| Tritanopia (no blue cones) | #80B7B9 | 0.041 |
| Achromatopsia (no color) | #ADADAD | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #91B1CB
#91B1CB
oklch(74.6% 0.051 243)
- #C5A68B
#C5A68B
oklch(74.6% 0.052 63)
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 #91B1CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Grey Blue #9DBCD4 ΔE 0.035
- Cool Steel #97A7B3 ΔE 0.037
- French Gray #ADB5BD ΔE 0.044
- Light Cornflower Blue #98C1D9 ΔE 0.045
- Bluegrey #85A3B2 ΔE 0.050
- Dark Gray #A9A9A9 ΔE 0.053
- Bluey Grey #89A0B0 ΔE 0.055
- Cool Grey #95A3A6 ΔE 0.055
Use #91B1CB 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.