| 27.11.2020: | Renewal of domain names: smath.org, smath.info, smath.com, ivashov.net, ivashov.info, ivashov.org (2 years) | $214,36 |
| 07.09.2020: | Hardware: SSD for server purchased (512GB) | $65,25 |
| 03.09.2020: | Hardware: RAM for server purchased (DDR4, 16GB) | $63,76 |
| 30.08.2020: | Hardware: Server PC purchased (LENOVO ThinkStation P330) | $1851,1 |
| 14.08.2020: | Apple Developer Program - Membership for one year | $99 |
| 08.07.2020: | Server Internet connection annual payment (2 years) | $176,89 |
| 05.08.2019: | Renewal of domain names: smath.org, smath.info, smath.com, ivashov.net, ivashov.info, ivashov.org, smathstudio.com (1-2 years) | $148,94 |
| 22.07.2019: | Server Internet connection annual payment (1 year) | $99,85 |
| 18.07.2019: | Apple Developer Program - Membership for one year | $99 |
| 29.12.2018: | Server Internet connection annual payment (1 year) | $77,73 |
| 16.12.2018: | mSATA SSD 256GB for server | $60,21 |
| 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 |