#3998A7
Closest named color: Sea (#3C9992). oklch(63% 0.09 209.7), rgb(57, 152, 167).
Aa
Black text reads best on this color (6.22:1).
About this color
#3998A7 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 63%, its chroma 0.090 and its hue 210°. Its hue sits on the cool side of the wheel. The nearest named color is Sea (#3C9992), ΔE 0.033 away. Black text reads best on it, at 6.22:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Sea (#3C9992) |
| Black text | 6.22:1 |
| White text | 3.37:1 |
Values
| HEX | #3998A7 |
| RGB | rgb(57, 152, 167) |
| HSL | hsl(188, 49%, 44%) |
| OKLCH | oklch(63% 0.09 209.7) |
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 #3998A7 | 3.37:1 | AA large text | Lc -66.4 | Content text, not long reading |
| Black text on #3998A7 | 6.22:1 | AA | Lc 43.1 | Non-text elements, placeholder text |
| #3998A7 text on white | 3.37:1 | AA large text | Lc 60.9 | Content text, not long reading |
| #3998A7 text on black | 6.22:1 | AA | Lc -40.8 | 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
#F1F7F8
oklch(97.2% 0.007 208.8)
-
Step 100
100
#E1ECEE
oklch(93.5% 0.012 209.8)
-
Step 200
200
#C8DEE2
oklch(88.5% 0.024 209.8)
-
Step 300
300
#A0C9D0
oklch(80.9% 0.044 209.1)
-
Step 400
400
#6AADB9
oklch(70.7% 0.07 210.1)
-
Step 500
500 (this color)
#3998A7
oklch(63% 0.09 209.7)
-
Step 600
600
#008292
oklch(55.6% 0.096 209.8)
-
Step 700
700
#006D7B
oklch(49% 0.085 210.2)
-
Step 800
800
#005A65
oklch(42.8% 0.074 209.1)
-
Step 900
900
#104A53
oklch(37.8% 0.059 210.3)
-
Step 950
950
#0C2B30
oklch(26.9% 0.037 209.8)
#3998A7 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) | #8B93A8 | 0.085 |
| Deuteranopia (no green cones) | #7B87A7 | 0.077 |
| Tritanopia (no blue cones) | #009F9C | 0.036 |
| Achromatopsia (no color) | #8C8C8C | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3998A7
#3998A7
oklch(63% 0.09 209.7)
- #B97469
#B97469
oklch(63% 0.089 29.6)
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 #3998A7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea #3C9992 ΔE 0.033
- Teal Green #0A9396 ΔE 0.036
- Cadet Blue #5F9EA0 ΔE 0.040
- Persian Green #2A9D8F ΔE 0.045
- Blue Green #0F9B8E ΔE 0.048
- Dusty Teal #4C9085 ΔE 0.049
- Dull Teal #5F9E8F ΔE 0.054
- Grey Teal #5E9B8A ΔE 0.054
Use #3998A7 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.