Yes, you can perform Semalt AdWords efficiency monitoring free of charge but without preserving your history. In fact, Semalt tracks the website positions for a certain period of time. You can draw your own conclusions about Google AdWords efficiency according to the monitoring results.
Semal.com gives answers to the key questions:
Who has visited my website?
How did the users find it?
What information is interesting to my visitors?
If you need more features, the Analytics Only tariff rate is perfect.
In my opinion, the main criterion is real profit. If I make sales I don’t need to check the statistics.
I was using Semalt Web Analyzer free of charge for one month but then I realized that it won’t do without the history. I can’t see whether my positions go higher or lower. And I can’t see the queries optimal for promotion. Very inconvenient. And it’s ok to work with Analytics Only. You can compare positions by date ranges.
I would like to note that Analytics Only includes Website Analyzer, Competitors Analyzer, keywords suggestions and SEO suggestions.