#137EF8
Closest named color: Clear Blue (#247AFD). oklch(60.7% 0.203 256.5), rgb(19, 126, 248).
Aa
Black text reads best on this color (5.36:1).
About this color
#137EF8 is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.203 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.014 away. Black text reads best on it, at 5.36:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.203) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.36:1 |
| White text | 3.91:1 |
Values
| HEX | #137EF8 |
| RGB | rgb(19, 126, 248) |
| HSL | hsl(212, 94%, 52%) |
| OKLCH | oklch(60.7% 0.203 256.5) |
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 #137EF8 | 3.91:1 | AA large text | Lc -71.3 | Content text, not long reading |
| Black text on #137EF8 | 5.36:1 | AA | Lc 38.3 | Non-text elements, placeholder text |
| #137EF8 text on white | 3.91:1 | AA large text | Lc 65.8 | Content text, not long reading |
| #137EF8 text on black | 5.36:1 | AA | Lc -35.9 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DEEBFD
oklch(93.6% 0.028 256.5)
-
Step 200
200
#C2DBFE
oklch(88.4% 0.055 256.8)
-
Step 300
300
#98C3FF
oklch(80.9% 0.097 256.8)
-
Step 400
400
#5CA1FF
oklch(70.6% 0.155 256.6)
-
Step 500
500 (this color)
#137EF8
oklch(60.7% 0.203 256.5)
-
Step 600
600
#006EE1
oklch(55.5% 0.194 256.7)
-
Step 700
700
#005DBE
oklch(49.2% 0.17 256.3)
-
Step 800
800
#004C9E
oklch(42.8% 0.148 256.4)
-
Step 900
900
#003F85
oklch(37.8% 0.131 256.3)
-
Step 950
950
#05254E
oklch(26.9% 0.084 256.6)
#137EF8 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) | #2F8BFC | 0.038 |
| Deuteranopia (no green cones) | #0078F6 | 0.017 |
| Tritanopia (no blue cones) | #009CAF | 0.153 |
| Achromatopsia (no color) | #818181 | 0.203 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #137EF8
#137EF8
oklch(60.7% 0.203 256.5)
- #AD7600
#AD7600
oklch(60.7% 0.127 76.3)
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 #137EF8, closest first.
No curated palette has a color within ΔE 0.04 of #137EF8.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.014
- Cerulean Blue #056EEE ΔE 0.043
- Dodger Blue #1E90FF ΔE 0.048
- Royal Blue #4169E1 ΔE 0.060
- Bright Blue #0165FC ΔE 0.062
- Dark Sky Blue #448EE4 ΔE 0.064
- Cornflower #6A79F7 ΔE 0.067
- Neon Blue #4361EE ΔE 0.070
Use #137EF8 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.