| 100% | MSDOS | 5 | ___ Mobile (Microsoft operating system announced on April 1, 2015) |
| 36% | WINDOWSXP | 9 | Microsoft operating system that preceded Vista |
| 36% | DOS | 3 | Early Microsoft operating system |
| 35% | ARIES | 5 | One born on April 1 |
| 35% | FOOL | 4 | Prank victim on April 1 |
| 35% | FOOL | 4 | Person tricked on April 1 |
| 33% | UNIX | 4 | Operating system on many Internet servers |
| 33% | IOS | 3 | Operating system seen on Apple phones |
| 33% | IOS | 3 | Operating system for Apple's mobile devices |
| 33% | RAM | 3 | Zodiac symbol for a person born on April 1 |
| 32% | SYMBIAN | 7 | Operating system on old Nokia and Samsung phones |
| 32% | GOOGLETV | 8 | Bygone operating system on some smart devices |
| 31% | IOS | 3 | Popular mobile phone operating system |
| 31% | WINDOWS | 7 | Microsoft operating system that came out in 1985 and now dominates the personal computer market |
| 30% | IOS | 3 | Popular mobile phone operating system developed by Apple |
| 30% | OREO | 4 | Name of the Android mobile operating system released to the public on August 21, 2017 |
| 29% | APPLECOMPUTER | 13 | Tech company founded by Steve Wozniak and Steve Jobs on April 1, 1976 (2 wds.) |
| 29% | WINDOWS | 7 | Microsoft's PC operating system |
| 28% | CPM | 3 | Operating system that preceded DOS, created in 1974 and used on Intel 8080/85-based microcomputers |
| 28% | IOS | 3 | Apple's mobile operating system |
| 27% | PINTO | 5 | Car model that the NHTSA announced on August 11, 1977, had a defective fuel system |
| 26% | ANDROID | 7 | Google's robotic mobile operating system |
| 26% | THENETHERLANDS | 14 | European country that legalized same-sex marriage on April 1, 2001, the first country in the world to do so (2 wds.) |
| 26% | BIGBANGTHEORY | 13 | Origin-of-the-universe premise first given scientific support in an essay published in "Physical Review" on April 1, 1948 (3 wds.) |
| 25% | FOOL | 4 | April 1 victim |
| 25% | FOOLER | 6 | April 1 prankster |
| 25% | ARIES | 5 | April 1 sign |
| 25% | PRANK | 5 | April 1 gag |
| 25% | ALLFOOLS | 8 | April 1 honorees |
| 25% | CIGAR | 5 | April 1 exploder |