#1B88BB
Closest named color: Blue NCS (#118AB2). oklch(59.3% 0.119 235.6), rgb(27, 136, 187).
Aa
Black text reads best on this color (5.28:1).
About this color
#1B88BB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.119 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.017 away. Black text reads best on it, at 5.28:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.28:1 |
| White text | 3.97:1 |
Values
| HEX | #1B88BB |
| RGB | rgb(27, 136, 187) |
| HSL | hsl(199, 75%, 42%) |
| OKLCH | oklch(59.3% 0.119 235.6) |
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 #1B88BB | 3.97:1 | AA large text | Lc -72.1 | Content text, not long reading |
| Black text on #1B88BB | 5.28:1 | AA | Lc 37.5 | Non-text elements, placeholder text |
| #1B88BB text on white | 3.97:1 | AA large text | Lc 66.6 | Content text, not long reading |
| #1B88BB text on black | 5.28:1 | AA | Lc -35.1 | Non-text elements, placeholder text |
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 600.
-
Step 50
50
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E0ECF3
oklch(93.6% 0.016 233)
-
Step 200
200
#C7DDEA
oklch(88.5% 0.03 233.6)
-
Step 300
300
#A0C7DF
oklch(81% 0.054 235.3)
-
Step 400
400
#69A9CF
oklch(70.6% 0.086 235.9)
-
Step 500
500
#3A93C2
oklch(63% 0.109 235.5)
-
Step 600
600 (this color)
#1B88BB
oklch(59.3% 0.119 235.6)
-
Step 700
700
#006994
oklch(49.2% 0.105 235.5)
-
Step 800
800
#00567A
oklch(42.8% 0.091 235.4)
-
Step 900
900
#104762
oklch(37.7% 0.072 235.2)
-
Step 950
950
#0C2A39
oklch(27% 0.045 233.7)
#1B88BB 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) | #6F87BD | 0.070 |
| Deuteranopia (no green cones) | #5A79BA | 0.058 |
| Tritanopia (no blue cones) | #00959A | 0.073 |
| Achromatopsia (no color) | #808080 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B88BB
#1B88BB
oklch(59.3% 0.119 235.6)
- #B3692F
#B3692F
oklch(59.3% 0.119 55.6)
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 #1B88BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.017
- Water Blue #0E87CC ΔE 0.027
- Steel Blue #4682B4 ΔE 0.028
- Cool Blue #4984B8 ΔE 0.029
- Nice Blue #107AB0 ΔE 0.042
- Off Blue #5684AE ΔE 0.043
- Teal Blue #01889F ΔE 0.046
- Dusty Blue #5A86AD ΔE 0.047
Use #1B88BB 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.