#3F91AA
Closest named color: Blue NCS (#118AB2). oklch(61.6% 0.087 221), rgb(63, 145, 170).
Aa
Black text reads best on this color (5.84:1).
About this color
#3F91AA is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 62%, its chroma 0.087 and its hue 221°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.037 away. Black text reads best on it, at 5.84:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (62%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.84:1 |
| White text | 3.59:1 |
Values
| HEX | #3F91AA |
| RGB | rgb(63, 145, 170) |
| HSL | hsl(194, 46%, 46%) |
| OKLCH | oklch(61.6% 0.087 221) |
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 #3F91AA | 3.59:1 | AA large text | Lc -68.8 | Content text, not long reading |
| Black text on #3F91AA | 5.84:1 | AA | Lc 40.8 | Non-text elements, placeholder text |
| #3F91AA text on white | 3.59:1 | AA large text | Lc 63.3 | Content text, not long reading |
| #3F91AA text on black | 5.84:1 | AA | Lc -38.4 | 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
#F1F6F8
oklch(97% 0.006 223.5)
-
Step 100
100
#E1ECF0
oklch(93.6% 0.013 221.4)
-
Step 200
200
#C9DDE4
oklch(88.5% 0.023 220.8)
-
Step 300
300
#A3C8D4
oklch(81% 0.043 219.5)
-
Step 400
400
#6FABBF
oklch(70.8% 0.069 221)
-
Step 500
500 (this color)
#3F91AA
oklch(61.6% 0.087 221)
-
Step 600
600
#1B7F9A
oklch(55.5% 0.095 221.3)
-
Step 700
700
#076C84
oklch(49.2% 0.088 220.7)
-
Step 800
800
#0F586B
oklch(42.8% 0.073 220.6)
-
Step 900
900
#174857
oklch(37.6% 0.057 221.9)
-
Step 950
950
#102A33
oklch(26.9% 0.036 223.3)
#3F91AA 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) | #828DAB | 0.072 |
| Deuteranopia (no green cones) | #7382AA | 0.065 |
| Tritanopia (no blue cones) | #009999 | 0.047 |
| Achromatopsia (no color) | #878787 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F91AA
#3F91AA
oklch(61.6% 0.087 221)
- #B2735C
#B2735C
oklch(61.7% 0.087 40.8)
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 #3F91AA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.037
- Dusty Blue #5A86AD ΔE 0.039
- Off Blue #5684AE ΔE 0.043
- Teal Blue #01889F ΔE 0.043
- Teal Green #0A9396 ΔE 0.043
- Cool Blue #4984B8 ΔE 0.049
- Faded Blue #658CBB ΔE 0.050
- Sea #3C9992 ΔE 0.050
Use #3F91AA 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.