Siftery has repeatedly engaged in Twitter spam. Here’s one example account, @SifteryHello that exists solely to mention other companies and individuals: https://twitter.com/SifteryHello

Check out the tweet history to see what I mean. They sent thousands of tweets from this account (and very possibly others), solely to get visibility for Siftery from the customers/others who search for the company's Twitter handle.

They take the same approach to other mediums. Regarding mholt’s comment, here’s another one: https://twitter.com/guusdk/status/909773952561696769

I can’t imagine ever trusting a company or person/team who does this.

Update: Here's another medium that Siftery spams, albeit at a lower volume - HN itself: https://news.ycombinator.com/submitted?id=ggiaco. ggiaco, an employee, submitted ~100 low-value Siftery pages about companies (rather than, say, the companies themselves, or sites he actually liked).

Update 2: Here's a second Twitter account, @SifteryFeed, which does the same thing as @SifteryHello: https://twitter.com/sifteryfeed. Example tweet:

> "Are you using Apache Hive (@TheASF) and recommend them? You can do it here http://siftery.com/some-landing-page … "

Search for the top alternatives for over 40k B2B software products.

We’re doing a couple of things here that this community might find interesting: A) Actually tracking when companies start and stop using a piece of software B) Using this “switch” data to calculate a probability that the switches are a true substitution and then rank the top substitutes for each product - based on actual switching behavior. 
We use a weighted average where the switches are weighted according to how much the product’s categories overlap (every product is tagged with 1-5 tags). For example, Intercom and Drift are closely related so when a company stops using Intercom and starts using Drift that’s heavily weighted. However, a percentage of the companies who stop using Intercom and then start using Zendesk are effectively substituting Intercom with Zendesk.

- You can use search to find a product, or start with the ones below:

https://siftery.com/intercom/alternatives https://siftery.com/mandrill/alternatives https://siftery.com/shopify/alternatives https://siftery.com/wordpress/alternatives https://siftery.com/lever/alternatives https://siftery.com/icims/alternatives



Note: There’s switch data for roughly 1k products (out of a total of 40k)

One of my pet peeves on the new products launched on HN has been a missing "About" page. If people are asking for personally identifiable information like emails etc, they should be open about who they are and what their competencies are in storing this kind of data.

Secondly, I don't see an explanation for what exactly the promoter score is?

Lastly, the source of data. While I am sure that is the secret sauce here, some of my personal fields have thrown up results which are far off the mark.

did a search on React.js, got some results that I expected, and some that I did not.

did a search on Vue.js, and the top 'alternative' is Bootstrap......

Yeah. Bootstrap isn't an alternative to Vue.js. They aren't even in the same wheel-house.

https://siftery.com/vuejs/alternatives

Siftery kind of annoyingly added my OSS project to it and started emailing me about it without me signing up for it... (months ago)

This strikes me as the business version of AlternativeTo.net, a stupendous website to help find alternative (consumer) software.

https://alternativeto.net/

Microsoft Word’s primary category is PDF Readers and Editors

I did not expect MS Word to be listed as a PDF Reader (and editor).

Does this mean that (according to your data) when a company switches away from MS Word, it's because they just wanted a PDF Reader? Perhaps that implies that those who don't switch away from it simply find that there is no substitute software for their principal use case.

Websites like this are completely useless once you know where to get real comparisons.

Just go to Google and type in "<product> vs " and let Google's autocomplete suggest the top competitors.

No need for sites like these.

How does a new entrant into a category get listed?

This is so cool, thanks guys :)!

Is this similar to stackshare?