| # | Name | Parties | Matches |
|---|---|---|---|
| ParlGov | 35 | 35 | |
| Manifesto Project | 17 | 17 | |
| ERDDA (2013) | 11 | 11 | |
| Mackie / Rose (1991) | 25 | 25 | |
| CHES | 11 | 11 | |
| EJPR PDY | 10 | 10 | |
| Kitschelt (2013) | 6 | 6 | |
| KUREP (2012) | 7 | 7 | |
| Huber / Inglehart (1995) | 5 | 5 | |
| Ray (1999) | 9 | 9 | |
| PPMD (2006) | 6 | 6 | |
| CLEA | 18 | 18 | |
| Janda (1980) | 3 | 3 | |
| EES 2014 | 5 | 5 | |
| PolCon | 12 | 12 | |
| PPDB (2017) | 5 | 5 | |
| CHISOLS | 10 | 10 | |
| DPI | 6 | 6 | |
| Jennings / Wlezien | 5 | 5 | |
| Wikipedia | 40 | 40 | |
| Global Elections DB | 9 | 9 | |
| Laver / Hunt | 7 | 7 | |
| euandi (GPS) | 6 | 6 | |
| Elections Global | 17 | 17 | |
| EP roll call votes | 9 | 9 | |
| IPOD | 10 | 10 | |
| MAPP | 8 | 8 | |
| CSES-IMD | 7 | 7 | |
| CCS | 6 | 6 | |
| PIP | 15 | 15 | |
| Mudde (2007) | 1 | 1 | |
| The PopuList | 5 | 5 | |
| V-Party | 14 | 14 | |
| POPPA | 10 | 10 | |
| TAP | 3 | 3 | |
| GPD | 2 | 2 | |
| PPMD (all) | 11 | 11 | |
| ESS prtc* | 18 | 18 | |
| ESS prtv* | 14 | 14 | |
| GPS 2019 | 10 | 10 | |
| NPED | 10 | 10 | |
| WhoGov | 6 | 6 | |
| Leaders Global | 5 | 5 | |
| PPEPE (2021) | 1 | 1 | |
| EU-NED | 24 | 24 | |
| Wikipedia tags | 33 | 33 | |
| Poll of Polls - Politico Europe | 15 | 15 |