| 22.11.2018: | Transfer of domain name: smath.com (many thanks to Thomas Nitsche for this gift) | $14,77 |
| 22.11.2018: | Renewal of domain names: smath.info, smath.org, smathstudio.com, ivashov.net (1 year) | $64,32 |
| 17.07.2018: | Apple Developer Program - Membership for one year | $99 |
| 03.07.2018: | Windows and Windows Phone Annual Developer Registration | $9,91 |
| 09.06.2018: | Google Play developer Registration Fee | $25 |
| 31.05.2018: | Code Signing Certificate purchased (4 years) | $268 |
| 02.03.2018: | Hardware: Development PC purchased (HP ProBook 430 G5) | $1230,14 |
| 25.11.2017: | Server Internet connection annual payment (1 year) | $92,26 |
| 13.07.2017: | Renewal of domain names: smath.info, smath.org, smathstudio.com, ivashov.net (1 year) | $55,88 |
| 07.06.2017: | Registration of domain names: smath.in, smath.xyz, smath.club (1 year) | $13,45 |
| 10.01.2017: | Renewal of domain name smathstudio.com (1 year) | $13,64 |
| 10.01.2017: | Renewal of domain name smath.info (1 year) | $14,64 |
| 31.12.2016: | Server Internet connection annual payment (1 year) | $89,29 |
| 08.12.2016: | Hardware: Keyboard (K375s Logitech) | $52,25 |
| 19.09.2016: | Google AdWords test company | $46,12 |
| 03.03.2016: | Renewal of domain name ivashov.net (2 years) | $20,7 |
| 23.12.2015: | Server Internet connection annual payment (1 year) | $75,99 |
| 26.08.2015: | Software: Xamarin.Android Business subscription (1 year) | $500 |
| 02.08.2015: | Renewal of domain name smath.org (3 years) | $38,87 |
| 30.03.2015: | Registration of domain name ivashov.net (1 year) | $10,95 |