SlapKit Reviews 

I looked for a free software library that would let me generate Excel files including charts without needing Excel installed on my computer.

I found SlapKit.Excel and I liked the following:
• It is compatible with ClosedXML APIs + providing additional features, including Chart generation.
• It is free for small developers and teams.

With my prior ClosedXML experience, the library was fairly easy to use, but I missed some important APIs for the area charts. I wrote an e-mail to the SlapKit team, summarizing my observations and wishes and they quickly responded. They promissed to add the missing APIs and inform me, once the library update is available.

The implementation took some time, but they kept their word, informed me and the new APIs were working as expected.

In summary, I am very satisfied with the library and the support.

I was having a bug with their plugin, Slapkit excel. I found the same bug in the plugin that this is a superset of (closedXml). After reaching out to Slapkit, I got a response the next day which included a workaround to get my project done.

Really straightforward package for reading Excel files. The technical support was very responsive.

I was using ClosedXML to handle the Excel files in .Net and it was doing a great job buuut it lacks quite some functionality (most notably charts). Switching to another library would have taken a lot of time so I was in a bad spot.

Then I found this hidden gem - SlapKit. Honestly, it's great - it's literally a bolt on replacement of ClosedXML with a bunch of added functionality.
It was a really seamless upgrade, nothing in my project broke.

Also the one-time, perpetual license was a nice change to the increasingly popular subscription model with UI controls lately.

Overall, it's reliable and just does what it's supposed to.

It's great to see a friendly Excel .NET library to come out which includes the much needed Chart support. Slapkit has the ease of use of Closed XML so getting to grips with the library was fast and easy. Their documentation was also detailed with examples which is a great help when learning the chart aspect of the library.

The staff have been amazing at responding to questions quickly and adding requested features to future releases, improving the product further.

To top all this off the pricing being free for small teams and very reasonable for larger teams is refreshing to see for small businesses / teams.

If you're looking for a library to output excel files this is a great product that deserves a review.