#3998BC
Closest named color: Faded Blue (#658CBB). oklch(63.9% 0.102 227), rgb(57, 152, 188).
Aa
Black text reads best on this color (6.39:1).
About this color
#3998BC is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 64%, its chroma 0.102 and its hue 227°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.047 away. Black text reads best on it, at 6.39:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.39:1 |
| White text | 3.28:1 |
Values
| HEX | #3998BC |
| RGB | rgb(57, 152, 188) |
| HSL | hsl(196, 53%, 48%) |
| OKLCH | oklch(63.9% 0.102 227) |
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 #3998BC | 3.28:1 | AA large text | Lc -65.3 | Content text, not long reading |
| Black text on #3998BC | 6.39:1 | AA | Lc 44.2 | Non-text elements, placeholder text |
| #3998BC text on white | 3.28:1 | AA large text | Lc 59.9 | Large or bold text, headings |
| #3998BC text on black | 6.39:1 | AA | Lc -41.8 | 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
#E0ECF1
oklch(93.6% 0.015 224.5)
-
Step 200
200
#C7DDE8
oklch(88.5% 0.028 229.2)
-
Step 300
300
#9FC8DA
oklch(80.9% 0.05 226.5)
-
Step 400
400
#68ABC7
oklch(70.7% 0.079 226.7)
-
Step 500
500 (this color)
#3998BC
oklch(63.9% 0.102 227)
-
Step 600
600
#007FA4
oklch(55.6% 0.108 227.1)
-
Step 700
700
#006B8A
oklch(49.2% 0.095 226.5)
-
Step 800
800
#005772
oklch(42.6% 0.083 227.6)
-
Step 900
900
#0D485D
oklch(37.6% 0.067 227.5)
-
Step 950
950
#0B2A36
oklch(26.8% 0.042 227.3)
#3998BC 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) | #8595BE | 0.076 |
| Deuteranopia (no green cones) | #7388BC | 0.067 |
| Tritanopia (no blue cones) | #00A2A4 | 0.057 |
| Achromatopsia (no color) | #8E8E8E | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3998BC
#3998BC
oklch(63.9% 0.102 227)
- #BF7854
#BF7854
oklch(64% 0.102 47.2)
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 #3998BC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.047
- Blue NCS #118AB2 ΔE 0.048
- Dusty Blue #5A86AD ΔE 0.053
- Cool Blue #4984B8 ΔE 0.056
- Off Blue #5684AE ΔE 0.056
- Cadet Blue #5F9EA0 ΔE 0.058
- Steel Blue #4682B4 ΔE 0.061
- Silver Lake Blue #778DA9 ΔE 0.063
Use #3998BC 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.