# Cron Lab: Crontab Editor — Cron schedules, plain English

> Cron schedule expression translator and visual builder for developers. (iPhone/iPad app by John Haas.)

- Source: https://appshunter.io/ios/app/cron-lab-crontab-editor/id6783486115 (this page in markdown: same URL + `.md`)
- Developer: [John Haas](https://appshunter.io/developer/356064826)
- Category: Developer Tools, Utilities
- Price: Free with in-app purchases
- Rating: 5.00/5 from 2 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 20 MB
- Languages: American English
- Released: 2026-08-06
- Data updated: 2026-08-30
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/cron-lab-crontab-editor/id6783486115/reviews.md

## What is Cron Lab?

Cron Lab reads and writes cron schedule expressions. Type one like "*/15 9-17 * * 1-5" and it tells you, in plain English, what it means, when it will run next in your timezone, and what might quietly break it.

Cron Lab is free. Four features (Convert, In words, backup and restore, and the Home Screen widget) are part of Cron Lab Pro, a one-time $0.99 in-app purchase.

Everything else listed below is free, and there is no subscription.

FREE

• Plain-English translation. Every expression becomes a clear sentence as you
  type, with a field-by-field breakdown below it.
• Next runs. Accurate, DST-safe previews for any IANA timezone, in 12- or
  24-hour time.
• Visual builder. Tap together a valid expression: every N minutes, specific
  days, ranges, steps, and lists.
• Schedule doctor. Explains why an expression never runs (February has no
  30th), warns about leap-year-only dates, and flags the day-of-month /
  day-of-week OR rule that surprises almost everyone.
• Examples and reference. A categorized library of common schedules and a
  built-in syntax cheat sheet.
• Your library. Save and label expressions, and browse recent history.

CRON LAB PRO (a one-time $0.99 in-app purchase)

• Convert. Turn a standard crontab line into Quartz, Spring @Scheduled, AWS
  EventBridge, Jenkins, Kubernetes CronJob, or GitHub Actions. Handles the
  tricky parts (seconds, day-of-week numbering, the "?" rule) and includes
  copy-ready snippets, like the full CronJob YAML.
• In words. Type "every weekday at 9am" or "the 1st of the month at noon" and
  get the matching expression.
• Backup and restore. Save your whole library to a JSON file and load it back.
• Home Screen widget. Pin a schedule to see its meaning and next run without
  opening the app.

PRIVATE BY DESIGN

• No ads, no tracking, no account. Your schedules never leave your device.
• Works completely offline.
• Clean, minimal design with full light and dark mode.
• VoiceOver labels, legible contrast, large tap targets.
• Supports 5-field crontab and 6-field (seconds) expressions, names (JAN-DEC,
  SUN-SAT), ranges, steps, lists, and @shortcuts (@daily, @reboot, and more).

Cron Lab Pro is a one-time $0.99 in-app purchase, not a subscription.

## Key features

- Plain-English translation of cron expressions
- Next run time previews
- Visual cron schedule builder
- Schedule error detection
- Cron expression conversion
- Offline functionality

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Cron Lab Pro | $0.99 | one-time |


## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/cron-lab-crontab-editor/id6783486115/reviews.md

### 5/5 — Intuitive Cron Tool & a Great Value!

*2026-08-25*

I’m impressed by the capability of this app! This app lets you convert to AWS, Kubernetes, Jenkins, Spring, or GitHub Actions flavors of Cron. If you want to create portable Cron configs this is the app for it.

I appreciate Cron Lab’s affordable one time payment pricing for the Pro. I ended up purchasing both the iOS version & Google Play version because I liked this app so much & wanted to support the project. Amazing job to the dev on this one! :)
–PKG

### 5/5 — Gets the job done

*2026-08-07*

The English to cron converter is awesome

## Frequently asked questions about Cron Lab

### What is Cron Lab?

Cron Lab is a developer tool that helps you understand, create, and manage cron schedule expressions. It translates them into plain English, shows next run times, and offers a visual builder.

### Does Cron Lab have ads?

No, Cron Lab is ad-free. It prioritizes user privacy and does not contain advertisements.

### How much does Cron Lab cost?

The core features of Cron Lab are free. The 'Cron Lab Pro' upgrade, which includes conversion, 'in words' functionality, backup/restore, and a widget, is a one-time in-app purchase of $0.99.

### What devices does Cron Lab support?

Cron Lab is available for iPhone, iPad, and iPod. It offers a clean design with full light and dark mode support.

### How often is Cron Lab updated?

Cron Lab was last updated on August 7, 2026, with version 1.0.1. The developer actively maintains the application.

### Can I use Cron Lab offline?

Yes, Cron Lab works completely offline. Your schedules never leave your device, ensuring privacy and accessibility without an internet connection.

### What kind of cron expressions does Cron Lab support?

Cron Lab supports both 5-field and 6-field (with seconds) crontab expressions. It also handles names (JAN-DEC, SUN-SAT), ranges, steps, lists, and @shortcuts like @daily and @reboot.

### What is the age rating for Cron Lab?

Cron Lab has an age rating of 4+. This indicates it is suitable for a wide audience, including children, due to its non-violent and educational nature.

## Version history (last 2 releases)

### 1.0.3 — 2026-08-20

Fixes schedules that were read wrongly, including 'mon-fri 9am'.
Reads more of the ways people write schedules: "every quarter hour", "at 1730", "at 9 and 5 on weekdays", "each day at eight thirty".
Clearer plain-English descriptions, especially for time windows and repeating steps.
Says why it can't build a schedule when cron genuinely can't express it.

### 1.0.1 — 2026-08-07

No release notes.

## More apps by John Haas

- [iSplatter: Splatter Paint Art](https://appshunter.io/ios/app/isplatter-splatter-paint-art/id356064821)
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- [Text Editor](https://appshunter.io/ios/app/text-editor/id6777578899)
- [NetKit: Ping & Network Tools](https://appshunter.io/ios/app/netkit-ping-and-network-tools/id6780238278)
- [Grainfall: Falling Sand](https://appshunter.io/ios/app/grainfall-falling-sand/id6797610785)

All apps by John Haas: https://appshunter.io/developer/356064826

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-30.*