Comparison

ISF Watchkeeper 4 vs OPSM

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

ISF Watchkeeper 4

This app helps seafarers track and manage their work and rest hours, ensuring compliance with international maritime regulations. It automatically tests timesheets against STCW and MLC 2006, providing real-time alerts for non-conformities and offering a cloud-based solution for easy access and team collaboration.

Highlights
  • Automatic compliance testing
  • Predictive calculation engine
  • Real-time alerts and notifications
  • Live compliance status monitoring
  • Electronic timesheet signing
  • Cloud-based collaboration
  • Offline functionality
Features
Read full description

ISF Watchkeeper 4 mobile app enables seafarers to record their work and rest hours on smartphone and tablet. Timesheets are automatically tested against STCW, MLC 2006 and other international and local regulations for compliance purposes. The predictive calculation engine helps manage work and rest hours compliance for you, keeping you notified of up coming non-conformities and helping you remain compliant. Cloud-based and totally cross platform, ISF Watchkeeper 4 provides seafarers with an efficient yet simple mobile solution that is full of great innovations, showing live compliance status, allowing real time tracking and testing, whilst making it easy to log hours of work and rest, and plan-ahead to avoid regulatory breaches. - Works on or offline - Syncs to ISF Watchkeeper 4 Web App for real-time collaboration across teams - Realtime alerts and notifications of upcoming non-conformance - Monitor your live Compliance Status - Electronic timesheet signing and verification - Manage your work schedules - Automatically log hours by your work schedule - Manage vessel joining and leaving - Copy logged hours across multiple days - Reporting Dashboard - Cloud based, no vessel installation required - Simple, intuitive User Interfaces A truly global brand, accepted by Port State Control and recognised as the gold standard work and rest hour solution, ISF Watchkeeper is developed in partnership with the International Chamber of Shipping (ICS), whose members include over 80 percent of the global merchant fleet and who have represented the industry at the International Maritime Organization (IMO) and International Labour Organization (ILO) for more than 50 years. No more printing: you can electronically sign and lock timesheets and have them available on your mobile or online for inspection as per IMO guidelines for the signing, tracking and verification of electronic certificates. Your data is synced to the cloud and accessible via the ISF Watchkeeper 4 web app, offering seamless team collaboration and powerful management and reporting functionality from the shore. Furthermore, our dedicated support team are on hand to assist at every turn, getting you up and running and ensure your software operation runs smoothly. The app is packed full of innovative features, benefitting from constant development and evolution by working alongside professionals in the industry and harnessing the decades of experience working extensively in the shipping industry. ISF Watchkeeper 4 is the smart way to help operators comply with the requirements of the ILO (MLC, 2006) and IMO International Convention on Standards of Training, Certification and Watchkeeping for Seafarers (STCW).

About

OPSM

Features
Read full description

Oil Palm Sustainable farm management (OPSM) mobile app provides a tool kits to facilitate farmers to collect, manage, measure and monitor wide range of real-time data sets, including farm profile and farm daily operation. The information is tailored and enable farmers able to tracks their and help farmers better manage their day-to-day work and future planning activities. Subsequently the farmers will be able to plan, analyse, and improve agricultural processes at a previously unimagined scale. The app is accompanying with Certification Assessment, a self-assessment tool that can be used to determine performance against RSPO criteria. While facilitate more profitable production and promote environmental stewardship.

Screenshots

ISF Watchkeeper 44 screens
OPSM4 screens

Verdict

The call

The clearest difference is update cadence: ISF Watchkeeper 4 at every 10 days against OPSM's every 2 months. OPSM's advantage is iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

ISF Watchkeeper 4 ships an update every 10 days, OPSM every 2 months. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

Scorecard2 real differences ยท 6 level
ISF Watchkeeper 4 versus OPSM: the parameters behind the verdict, then further details
ParameterISF Watchkeeper 4OPSM
PriceFreeFree
Positive reviews50.0% of reviewsโ€”
Update frequencyEvery 10 days โ€” betterEvery 2 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeโ€”
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.013.0 โ€” better
Further details โ€” not scored
Size39 MB72 MB
Age rating4+4+
DeveloperIT EnergyMIMOS Berhad

In-app purchases

None

ISF Watchkeeper 4

No in-app purchases

None

OPSM

No in-app purchases

Questions

Is ISF Watchkeeper 4 free?
ISF Watchkeeper 4 is free to download, with no in-app purchases.
Is OPSM free?
OPSM is free to download, with no in-app purchases.
Do ISF Watchkeeper 4 or OPSM have ads?
Neither ISF Watchkeeper 4 nor OPSM shows ads.
Which is updated more often, ISF Watchkeeper 4 or OPSM?
ISF Watchkeeper 4 ships an update every 10 days, and OPSM every 2 months. Most recently, ISF Watchkeeper 4 was updated on October 24, 2026 and OPSM on October 27, 2026.

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