#3F99BF
Closest named color: Faded Blue (#658CBB). oklch(64.5% 0.102 229.3), rgb(63, 153, 191).
Aa
Black text reads best on this color (6.52:1).
About this color
#3F99BF is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 64%, its chroma 0.102 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.045 away. Black text reads best on it, at 6.52:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.52:1 |
| White text | 3.22:1 |
Values
| HEX | #3F99BF |
| RGB | rgb(63, 153, 191) |
| HSL | hsl(198, 50%, 50%) |
| OKLCH | oklch(64.5% 0.102 229.3) |
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 #3F99BF | 3.22:1 | AA large text | Lc -64.6 | Content text, not long reading |
| Black text on #3F99BF | 6.52:1 | AA | Lc 44.9 | Non-text elements, placeholder text |
| #3F99BF text on white | 3.22:1 | AA large text | Lc 59.2 | Large or bold text, headings |
| #3F99BF text on black | 6.52:1 | AA | Lc -42.6 | 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
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C7DDE8
oklch(88.5% 0.028 229.2)
-
Step 300
300
#A0C7DB
oklch(80.8% 0.05 230.4)
-
Step 400
400
#6AAAC8
oklch(70.6% 0.079 229.5)
-
Step 500
500 (this color)
#3F99BF
oklch(64.5% 0.102 229.3)
-
Step 600
600
#007EA6
oklch(55.5% 0.11 229.3)
-
Step 700
700
#006A8C
oklch(49% 0.097 229.1)
-
Step 800
800
#005774
oklch(42.7% 0.085 229.4)
-
Step 900
900
#10485E
oklch(37.8% 0.067 229.4)
-
Step 950
950
#0C2A37
oklch(26.9% 0.043 229.9)
#3F99BF 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) | #8597C1 | 0.071 |
| Deuteranopia (no green cones) | #748ABE | 0.062 |
| Tritanopia (no blue cones) | #00A4A6 | 0.061 |
| Achromatopsia (no color) | #8F8F8F | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F99BF
#3F99BF
oklch(64.5% 0.102 229.3)
- #BF7A54
#BF7A54
oklch(64.4% 0.101 49.1)
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 #3F99BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.045
- Blue NCS #118AB2 ΔE 0.054
- Dusty Blue #5A86AD ΔE 0.055
- Cool Blue #4984B8 ΔE 0.058
- Cadet Blue #5F9EA0 ΔE 0.058
- Off Blue #5684AE ΔE 0.059
- Silver Lake Blue #778DA9 ΔE 0.061
- Greyblue #77A1B5 ΔE 0.062
Use #3F99BF 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.