#3397BF
Closest named color: Blue NCS (#118AB2). oklch(63.7% 0.108 229), rgb(51, 151, 191).
Aa
Black text reads best on this color (6.31:1).
About this color
#3397BF is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 64%, its chroma 0.108 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.045 away. Black text reads best on it, at 6.31:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 6.31:1 |
| White text | 3.32:1 |
Values
| HEX | #3397BF |
| RGB | rgb(51, 151, 191) |
| HSL | hsl(197, 58%, 47%) |
| OKLCH | oklch(63.7% 0.108 229) |
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 #3397BF | 3.32:1 | AA large text | Lc -65.7 | Content text, not long reading |
| Black text on #3397BF | 6.31:1 | AA | Lc 43.8 | Non-text elements, placeholder text |
| #3397BF text on white | 3.32:1 | AA large text | Lc 60.3 | Content text, not long reading |
| #3397BF text on black | 6.31:1 | AA | Lc -41.4 | 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 500.
-
Step 50
50
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E0ECF2
oklch(93.6% 0.015 229)
-
Step 200
200
#C6DDE9
oklch(88.4% 0.03 230.3)
-
Step 300
300
#9EC8DC
oklch(80.9% 0.053 228.6)
-
Step 400
400
#65ABCB
oklch(70.7% 0.085 229.2)
-
Step 500
500 (this color)
#3397BF
oklch(63.7% 0.108 229)
-
Step 600
600
#007EA6
oklch(55.5% 0.11 229.3)
-
Step 700
700
#006A8C
oklch(49% 0.097 229.1)
-
Step 800
800
#005773
oklch(42.7% 0.084 228.5)
-
Step 900
900
#09485F
oklch(37.7% 0.07 229.1)
-
Step 950
950
#0A2A38
oklch(26.9% 0.045 230.7)
#3397BF 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) | #8295C1 | 0.076 |
| Deuteranopia (no green cones) | #6F87BE | 0.065 |
| Tritanopia (no blue cones) | #00A2A4 | 0.062 |
| Achromatopsia (no color) | #8D8D8D | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3397BF
#3397BF
oklch(63.7% 0.108 229)
- #BF764E
#BF764E
oklch(63.6% 0.107 48.8)
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 #3397BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.045
- Faded Blue #658CBB ΔE 0.048
- Cool Blue #4984B8 ΔE 0.053
- Dusty Blue #5A86AD ΔE 0.053
- Off Blue #5684AE ΔE 0.055
- Steel Blue #4682B4 ΔE 0.058
- Water Blue #0E87CC ΔE 0.058
- Teal Blue #01889F ΔE 0.065
Use #3397BF 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.