This week, the overall grades of 4 Software stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, TiVo Inc.’s (TIVO) rating worsens to a D from the company’s C rating a week ago. TiVo Inc. provides technology and services that allow consumers to watch and record live television. For more information, get Portfolio Grader’s complete analysis of TIVO stock.

Sonic Foundry, Inc. (SOFO) gets weaker ratings this week as last week’s C drops to a D. Sonic Foundry, Inc. provides software products and services for the creation and editing of digital audio and video content. The company also gets F’s in return on equity. For more information, get Portfolio Grader’s complete analysis of SOFO stock.

Slipping from a D to a F rating, Evolving Systems, Inc. (EVOL) takes a hit this week. Evolving Systems, Inc. is a software company providing business and operational support services and solutions to the telecommunications industry. The company also gets F’s in sales growth and earnings momentum. For more information, get Portfolio Grader’s complete analysis of EVOL stock.

COPsync, Inc.’s (COYN) rating weakens this week, dropping to a F versus last week’s D. The company also gets F’s in free cash flow. For more information, get Portfolio Grader’s complete analysis of COYN stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.