UPDATE 1-Keynote Systems Q2 beats, sees strong Q3

* Q2 adj EPS $0.29 vs est $0.21

* Q2 rev $24.1 mln vs est $23.6 mln

* Sees Q3 above consensus

* Shares up 10 pct after mkt

April 26 (Reuters) - Internet monitoring systems maker Keynote Systems posted a quarterly profit that handily beat Wall Street estimates as revenue jumped by a fourth, and forecast a strong third quarter.

"The solid revenues posted this quarter continue to support our new growth trajectory in both our mobile and internet businesses," Chief Executive Umang Gupta said in a statement.

The company's mobile business grew 26 percent in the second quarter, while its internet business grew 15 percent.

Net income was $3.3 million, or 19 cents a share, compared with a net loss of $144,000, or 1 cent a share, a year ago.

Revenue rose 25 percent to $24.1 million.

For the third quarter, Keynote expects earnings of 22-28 cents a share, excluding items, and revenue of $24.5-$25.5 million.

Analysts were looking for an adjusted profit of 21 cents a share on revenue of $23.8 million, according to Thomson Reuters I/B/E/S.

Shares of the San Mateo, California-based company were up 10 percent at $23.39 in trading after the bell. They closed at $21.24 on Tuesday on Nasdaq. (Reporting by Sayantani Ghosh in Bangalore; Editing by Don Sebastian)