Markets have been so volatile this summer on U.S.-China trade tensions that investors might not have noticed: Tech stocks are absolutely red-hot in 2019.

Indeed, the technology sector of Standard & Poor's 500-stock index is leading the broader market by a mile this year, with a year-to-date gain of 29% through Aug. 21. By comparison, the S&P 500 is up about 17%, while the tech-heavy Nasdaq Composite Index has risen 21%. (The second-best performing sector is real estate, up 25%.)

Stellar gains are always welcome, but they do pose a challenge for investors. After such a big run-up, is there anything left worth buying at current levels?

Analyst sure think so. Between momentum and the sector's outsize growth prospects, plenty of tech stocks have nowhere near topped out, they say.

To see which picks analysts like best at this point, we screened the Nasdaq Composite for the top-rated small, midsize and large tech stocks. S&P Global Market Intelligence surveys analysts' ratings on stocks and scores them on a five-point scale, where 1.0 equals Strong Buy and 5.0 means Strong Sell. Any score of 2.0 or lower means that analysts, on average, rate the stock a Buy. The closer the score gets to 1.0, the better.

Here are the 12 tech stocks the analysts love right now. This group is broken down into the four best-rated stock picks in the small-, mid- and large-cap spaces.

Top-Rated Small Tech Stock #4: Varonis Systems

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Analysts think highly of Varonis Systems' (VRNS, $70.28) strategic plan.

Like many tech stocks, the cybersecurity software company is transitioning away from selling licenses and toward a cloud-based subscription model. Although pivoting to