#3987A7
Closest named color: Blue NCS (#118AB2). oklch(58.9% 0.09 228.3), rgb(57, 135, 167).
Aa
Black text reads best on this color (5.19:1).
About this color
#3987A7 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 59%, its chroma 0.090 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.022 away. Black text reads best on it, at 5.19:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.19:1 |
| White text | 4.04:1 |
Values
| HEX | #3987A7 |
| RGB | rgb(57, 135, 167) |
| HSL | hsl(197, 49%, 44%) |
| OKLCH | oklch(58.9% 0.09 228.3) |
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 #3987A7 | 4.04:1 | AA large text | Lc -72.9 | Content text, not long reading |
| Black text on #3987A7 | 5.19:1 | AA | Lc 36.7 | Non-text elements, placeholder text |
| #3987A7 text on white | 4.04:1 | AA large text | Lc 67.4 | Content text, not long reading |
| #3987A7 text on black | 5.19:1 | AA | Lc -34.2 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECF0
oklch(93.7% 0.012 223.5)
-
Step 200
200
#CBDCE5
oklch(88.4% 0.022 230.6)
-
Step 300
300
#A6C6D6
oklch(80.8% 0.041 229.5)
-
Step 400
400
#75A9C1
oklch(70.7% 0.065 228.5)
-
Step 500
500
#4E93B1
oklch(63% 0.083 228.5)
-
Step 600
600 (this color)
#3987A7
oklch(58.9% 0.09 228.3)
-
Step 700
700
#1F6986
oklch(49% 0.084 228.8)
-
Step 800
800
#1D566D
oklch(42.7% 0.069 228.6)
-
Step 900
900
#1E4758
oklch(37.6% 0.054 228)
-
Step 950
950
#132A34
oklch(27.1% 0.034 228.3)
#3987A7 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) | #7685A9 | 0.065 |
| Deuteranopia (no green cones) | #6779A7 | 0.058 |
| Tritanopia (no blue cones) | #009091 | 0.055 |
| Achromatopsia (no color) | #7E7E7E | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3987A7
#3987A7
oklch(58.9% 0.09 228.3)
- #A86C4C
#A86C4C
oklch(58.8% 0.089 48.5)
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 #3987A7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.022
- Teal Blue #01889F ΔE 0.027
- Steel Blue #4682B4 ΔE 0.030
- Off Blue #5684AE ΔE 0.031
- Dusty Blue #5A86AD ΔE 0.033
- Cool Blue #4984B8 ΔE 0.034
- Cerulean #457B9D ΔE 0.034
- Stormy Blue #507B9C ΔE 0.037
Use #3987A7 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.