#3977FE
Closest named color: Clear Blue (#247AFD). oklch(60.6% 0.211 263), rgb(57, 119, 254).
Aa
Black text reads best on this color (5.24:1).
About this color
#3977FE is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.211 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.013 away. Black text reads best on it, at 5.24:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.211) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.24:1 |
| White text | 4.00:1 |
Values
| HEX | #3977FE |
| RGB | rgb(57, 119, 254) |
| HSL | hsl(221, 99%, 61%) |
| OKLCH | oklch(60.6% 0.211 263) |
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 #3977FE | 4.00:1 | AA large text | Lc -72.3 | Content text, not long reading |
| Black text on #3977FE | 5.24:1 | AA | Lc 37.3 | Non-text elements, placeholder text |
| #3977FE text on white | 4.00:1 | AA large text | Lc 66.8 | Content text, not long reading |
| #3977FE text on black | 5.24:1 | AA | Lc -34.9 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#DFEAFF
oklch(93.5% 0.031 263.5)
-
Step 200
200
#C6DAFF
oklch(88.5% 0.056 262.8)
-
Step 300
300
#A0C1FF
oklch(80.9% 0.095 262.7)
-
Step 400
400
#6D9EFF
oklch(70.8% 0.152 262.8)
-
Step 500
500 (this color)
#3977FE
oklch(60.6% 0.211 263)
-
Step 600
600
#2263F7
oklch(55.6% 0.231 263.1)
-
Step 700
700
#1651D7
oklch(49.1% 0.214 263)
-
Step 800
800
#1443AE
oklch(42.6% 0.178 263.1)
-
Step 900
900
#173B89
oklch(37.8% 0.137 262.9)
-
Step 950
950
#0E2350
oklch(26.9% 0.087 263)
#3977FE 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) | #0088FF | 0.043 |
| Deuteranopia (no green cones) | #0076FB | 0.025 |
| Tritanopia (no blue cones) | #0098AF | 0.165 |
| Achromatopsia (no color) | #7F7F7F | 0.212 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3977FE
#3977FE
oklch(60.6% 0.211 263)
- #A67A00
#A67A00
oklch(60.7% 0.125 83.2)
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 #3977FE, closest first.
No curated palette has a color within ΔE 0.04 of #3977FE.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.013
- Cerulean Blue #056EEE ΔE 0.044
- Cornflower #6A79F7 ΔE 0.052
- Royal Blue #4169E1 ΔE 0.053
- Bright Blue #0165FC ΔE 0.055
- Neon Blue #4361EE ΔE 0.055
- Dodger Blue #1E90FF ΔE 0.061
- Soft Blue #6488EA ΔE 0.073
Use #3977FE 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.