#1997CF
Closest named color: Water Blue (#0E87CC). oklch(63.9% 0.13 235), rgb(25, 151, 207).
Aa
Black text reads best on this color (6.36:1).
About this color
#1997CF is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.130 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.046 away. Black text reads best on it, at 6.36:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 6.36:1 |
| White text | 3.29:1 |
Values
| HEX | #1997CF |
| RGB | rgb(25, 151, 207) |
| HSL | hsl(198, 78%, 45%) |
| OKLCH | oklch(63.9% 0.13 235) |
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 #1997CF | 3.29:1 | AA large text | Lc -65.3 | Content text, not long reading |
| Black text on #1997CF | 6.36:1 | AA | Lc 44.2 | Non-text elements, placeholder text |
| #1997CF text on white | 3.29:1 | AA large text | Lc 59.8 | Large or bold text, headings |
| #1997CF text on black | 6.36:1 | AA | Lc -41.9 | 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
#F0F6FA
oklch(97% 0.008 236.6)
-
Step 100
100
#DFECF5
oklch(93.6% 0.018 237.8)
-
Step 200
200
#C4DDEE
oklch(88.4% 0.036 237.6)
-
Step 300
300
#99C8E4
oklch(80.9% 0.063 234.7)
-
Step 400
400
#5BABD7
oklch(70.8% 0.102 234.8)
-
Step 500
500 (this color)
#1997CF
oklch(63.9% 0.13 235)
-
Step 600
600
#007DAE
oklch(55.7% 0.118 234.9)
-
Step 700
700
#006993
oklch(49.2% 0.104 234.9)
-
Step 800
800
#005679
oklch(42.8% 0.09 234.7)
-
Step 900
900
#004766
oklch(37.6% 0.081 235.8)
-
Step 950
950
#042A3D
oklch(27% 0.054 235.8)
#1997CF 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) | #7B96D2 | 0.077 |
| Deuteranopia (no green cones) | #6487CE | 0.063 |
| Tritanopia (no blue cones) | #00A6AA | 0.081 |
| Achromatopsia (no color) | #8E8E8E | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1997CF
#1997CF
oklch(63.9% 0.13 235)
- #C77434
#C77434
oklch(63.9% 0.13 55.1)
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 #1997CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.046
- Dark Sky Blue #448EE4 ΔE 0.050
- Blue NCS #118AB2 ΔE 0.053
- Cool Blue #4984B8 ΔE 0.057
- Faded Blue #658CBB ΔE 0.058
- Chefchaouen Blue #4895EF ΔE 0.058
- Steel Blue #4682B4 ΔE 0.063
- Dusty Blue #5A86AD ΔE 0.067
Use #1997CF 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.