Comparison

GreenBook vs SUB

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

Head to head
About

GreenBook

Access Ontario's Occupational Health and Safety Act and Regulations. This tool allows for easy searching, bookmarking, and highlighting of key passages to aid in workplace compliance. A downloadable safety board posting is also available.

Highlights
  • Access Ontario's Health and Safety Act
  • Searchable Regulations
  • Bookmark key passages
  • Highlight text
  • Global search across documents
  • Downloadable safety board posting
Features
Read full description

DISCLAIMER: GreenBook is not affiliated with the Government of Ontario. GreenBook's contents are for informational purposes only. All documents referenced in this app are retrieved from https://www.ontario.ca/laws. This app's intended use is as a tool for compliance. Under 25(2)(i) of the Occupational Health and Safety Act, R.S.O. 1990, c. O.1, employers are required to post a copy of this Act, and any explanatory material prepared by the Ministry, in a conspicuous place at the workplace. A safety board posting that directs users to download this app is downloadable from app main screen - PDF button. GreenBook provides users with access to Ontario's Health and Safety Act and Regulations. The Act and Regulations are searchable and bookmarkable, including a global search across all documents to help you find what you're looking for. The Search function on the home page searches all available documents. Searching in a document will only search that doc. You can highlight a passage of text, preferably a section heading, and click the Bookmark button. These bookmarks can be reordered by holding and dragging. Clicking the "i" button while viewing a doc opens the e-Law website for that doc.

About

SUB

Features
Read full description

SUB-ZERO is the all-in-one ice operations platform designed to help arenas deliver elite ice conditions, improve efficiency, and make smarter, data-driven decisions every single day. Built specifically for rink operators, technicians, and facility managers, SUB-ZERO replaces paper logs and guesswork with real-time digital tracking, operational visibility, and actionable insights. Core Features Ice Intelligence Record ice thickness across full-sheet measurement grids Track surface temperature and hardness (Shore C) Monitor water quality, including temperature, TDS, and pH Visualize trends and support more consistent, high-quality ice conditions Flood and Resurfacing Logs Digitally log each flood in seconds Track water usage, flood duration, and flood frequency Identify inefficiencies and reduce waste over time Ice Resurfacer Tracking Log equipment usage and operational performance Monitor blade changes, maintenance activity, and repairs Improve consistency across operators and resurfacing routines Plant and Facility Readings Record key ice plant data alongside daily ice operations Compare plant performance with ice condition results Support better energy use and more efficient facility operation SUB-ZERO gives arena teams a single, connected system for managing ice quality, equipment activity, and daily operational reporting.

Screenshots

GreenBook4 screens
SUB4 screens

Verdict

The call

The clearest difference is update cadence: SUB at fortnightly against GreenBook's every 3 months. GreenBook's advantage is iOS requirement (13 vs 18.0). 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

GreenBook ships an update every 3 months, SUB fortnightly. The most recent releases landed on September 23, 2026 and October 1, 2026 respectively.

Scorecard2 real differences ยท 6 level
GreenBook versus SUB: the parameters behind the verdict, then further details
ParameterGreenBookSUB
PriceFreeFree
Positive reviews100.0% of reviewsโ€”
Update frequencyEvery 3 monthsFortnightly โ€” better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeโ€”
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS13 โ€” better18.0
Further details โ€” not scored
Size26 MB35 MB
Age rating4+12+
DeveloperTanner MackenzieMarmak Industries Ltd

In-app purchases

None

GreenBook

No in-app purchases

None

SUB

No in-app purchases

Questions

Is GreenBook free?
GreenBook is free to download, with no in-app purchases.
Is SUB free?
SUB is free to download, with no in-app purchases.
Do GreenBook or SUB have ads?
Neither GreenBook nor SUB shows ads.
Which is updated more often, GreenBook or SUB?
GreenBook ships an update every 3 months, and SUB fortnightly. Most recently, GreenBook was updated on September 23, 2026 and SUB on October 1, 2026.

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