The free crontab.guru alternative that ships every feature you actually use
crontab.guru is the tool most of us learned cron on, and it is very good at what it does. This is the alternative for when you want to see further ahead than the next run and be warned about the one cron rule that quietly breaks schedules.
Cron Expression Parser vs crontab.guru, feature by feature
| Feature | Molixa | crontab.guru |
|---|---|---|
| Plain-English explanation | Yes | Yes |
| Next fire times shown | Next 10 | Short preview |
| Day-of-month / day-of-week OR rule | Called out, and visible in the run list | Not flagged |
| Error messages | Names the field, the value, and the accepted range | Marks the expression invalid |
| Signup | None | None |
| Cost | Free | Free |
| Upsell | None | Cronitor monitoring, by the same team |
| Runs offline in the browser | Yes | Yes |
| Other developer tools on the same site | 52 more, including regex, JSON, JWT and hashing | Cron only |
4 reasons people switch to Molixa
Ten runs, not a glimpse
A weekday-only schedule looks identical to a daily one if you only see the next fire time. Ten runs is enough to see the shape of a schedule: which days it skips, whether the interval drifts across midnight, and whether a monthly job lands where you assumed.
The OR rule is shown, not hidden
In POSIX cron, when day-of-month AND day-of-week are both set, the job runs when EITHER matches. So 0 0 1 * 1 fires on the 1st and on every Monday, which is almost never what people mean. We say so on screen and the run list proves it, instead of letting you find out from production.
Errors that name the problem
An invalid expression gets the field, the offending value, and the accepted range: 60 is out of range for the minute field, which accepts 0 and 59. That is faster to act on than being told the whole line is wrong.
It sits with the rest of your tools
Cron work rarely happens alone. The same site has a regex tester, JSON formatter, JWT decoder, hash generator and 49 others, all free and all browser-side, so debugging a deploy script does not mean four separate tabs from four separate vendors.
When to pick Molixa vs crontab.guru
crontab.guru earned its place. It is fast, free, has no signup, and it is where most developers first understood what five asterisks in a row actually mean. If it is already in your muscle memory, there is no reason to fight that.
Two things sent us to build an alternative rather than another wrapper.
The first is how far ahead you can see. Knowing the next run tells you the expression parses. It does not tell you the schedule is right. A job meant for weekdays and a job meant for every day look the same until the weekend arrives. Ten fire times makes the shape of a schedule visible: the skipped days, the rollover across midnight, the monthly job that lands on the wrong date because the month is short.
The second is the day rule. In POSIX cron, if you set both day-of-month and day-of-week to anything other than a wildcard, the job runs when EITHER matches. Not both. So 0 0 1 * 1 does not mean the first Monday of the month, it means the 1st of the month plus every Monday. This surprises people repeatedly, it is not a syntax error so nothing warns you, and it usually shows up as a job that ran four times more often than intended. We flag it, and the run list demonstrates it.
Everything runs in your browser. There is no account, no paid tier, and nothing to upsell you.
Where crontab.guru stays ahead: it is the known name, it is beautifully single-purpose, and its library of cron examples is a genuine reference. If you want one page that does one thing and you already know where the box is, use it.
Where crontab.guru is still the better choice
Honest answer first. crontab.guru has real strengths. If any of these match your workflow, stick with them.
- crontab.guru is the tool most developers already know, and the muscle memory is worth a lot.
- crontab.guru is free, has no signup, and has never put its core editor behind a paywall.
- crontab.guru is backed by Cronitor, so the cron expertise behind it is real and actively maintained.
- crontab.guru publishes a well-known library of cron examples and guides that rank for good reason.
- crontab.guru loads instantly and does exactly one thing, which is a genuine design virtue.
Try Cron Expression Parser, it's actually free
Runs in your browser. No watermark. Nothing to install.
Open Cron Expression Parser