#3D91C7
Closest named color: Cool Blue (#4984B8). oklch(62.9% 0.114 240.4), rgb(61, 145, 199).
Aa
Black text reads best on this color (6.07:1).
About this color
#3D91C7 is a medium-light, moderately saturated blue. In OKLCH its lightness is 63%, its chroma 0.114 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.038 away. Black text reads best on it, at 6.07:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 6.07:1 |
| White text | 3.45:1 |
Values
| HEX | #3D91C7 |
| RGB | rgb(61, 145, 199) |
| HSL | hsl(203, 55%, 51%) |
| OKLCH | oklch(62.9% 0.114 240.4) |
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 #3D91C7 | 3.45:1 | AA large text | Lc -67.3 | Content text, not long reading |
| Black text on #3D91C7 | 6.07:1 | AA | Lc 42.2 | Non-text elements, placeholder text |
| #3D91C7 text on white | 3.45:1 | AA large text | Lc 61.8 | Content text, not long reading |
| #3D91C7 text on black | 6.07:1 | AA | Lc -39.9 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1ECF4
oklch(93.7% 0.016 239.1)
-
Step 200
200
#C8DCEC
oklch(88.4% 0.031 242)
-
Step 300
300
#A1C6E2
oklch(80.9% 0.056 241)
-
Step 400
400
#6BA8D3
oklch(70.7% 0.089 240.4)
-
Step 500
500 (this color)
#3D91C7
oklch(62.9% 0.114 240.4)
-
Step 600
600
#0E7BB4
oklch(55.6% 0.124 240.1)
-
Step 700
700
#00679A
oklch(49.1% 0.113 240.5)
-
Step 800
800
#06547E
oklch(42.6% 0.096 240.8)
-
Step 900
900
#134665
oklch(37.7% 0.075 240.2)
-
Step 950
950
#0E293B
oklch(27% 0.047 240.8)
#3D91C7 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) | #7891C9 | 0.059 |
| Deuteranopia (no green cones) | #6584C6 | 0.048 |
| Tritanopia (no blue cones) | #009EA4 | 0.078 |
| Achromatopsia (no color) | #8A8A8A | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D91C7
#3D91C7
oklch(62.9% 0.114 240.4)
- #BB7739
#BB7739
oklch(63% 0.115 60.4)
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 #3D91C7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.038
- Faded Blue #658CBB ΔE 0.038
- Water Blue #0E87CC ΔE 0.041
- Blue NCS #118AB2 ΔE 0.044
- Steel Blue #4682B4 ΔE 0.045
- Dusty Blue #5A86AD ΔE 0.046
- Off Blue #5684AE ΔE 0.047
- Dark Sky Blue #448EE4 ΔE 0.048
Use #3D91C7 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.