Comparison

HTML Viewer Pro vs Chemcalc

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

Head to head
About

HTML Viewer Pro

View HTML source code from URLs or directly from Safari. This app offers multi-tab browsing, bookmarking, and search functionality. Customize the display with various themes, fonts, and user agents.

Highlights
  • View source code from URLs
  • View source code from Safari share
  • Multi-tab browsing
  • Bookmark and history management
  • Keyword search in source code
  • Switch between static and dynamic HTML
  • Customizable themes and fonts
Features
Read full description

It is a multi-functional HTML source viewer. You can view the source code by URLs, and of course, you can also view the source code from Safari's share button. Since it is the latest version of the app, it covers almost all the features of other apps. [Features & Functions] - Browser and source code switching. - Multi-tab browsing. - Display bookmarks and history. - Search for keywords in the source code. - Switch between static and dynamic HTML. - Changing the user agent. - Display non-HTML languages. - Use the cloud, such as iCloud, Dropbox, OneDrive, etc. - Use local files in the iPhone and iPad. - Balanced light operation. [View source code] - About 90 different design themes available. - Change the font, size and line spacing. - Switch between static and dynamic HTML. - Support for almost all programming languages (over 180). [Terms & Conditions] https://www.hayaya.net/terms-conditions/html-viewer.html [Privacy Policy] https://www.hayaya.net/privacy-policy/html-viewer.html

About

Chemcalc

Features
Read full description

Chemcalc is a practical spray planning app for farmers, contractors, and agronomists working in New Zealand and Australia. It helps you work out application rates, tank loads, and product totals quickly and clearly, so you can spend less time on arithmetic and more time in the field. Use the spray rate calculator to plan a job from the basics that matter: area, water rate, product rate, tank size, and equipment. Chemcalc works out how much product you need, how many tank loads are required, and keeps the maths consistent as you adjust inputs. You can save completed calculations and open them again later when you need to repeat a job or check what you used last time. Build a library of your own chemicals with label information at hand. Add and edit products, attach photos, and open label PDFs when you need to confirm rates, restrictions, or other label details. Label PDFs can be saved locally after you view them, so they are available again even when you are offline. Rates from labels can be applied in the calculator to reduce manual entry and mistakes. Create tank mixes that combine several products into one recipe, and save spray equipment profiles for tractors, trucks, helicopters, and other setups with tank capacity, speed, and boom width. The flow rate calculator helps you turn a single nozzle measurement into total flow and application rate, which is useful when checking or setting up application equipment. When you need transport paperwork, Chemcalc can help you draft a dangerous goods consignment note from a saved job and label data, pulling together the shipping information required for moving agricultural chemicals. Chemcalc supports both metric and imperial units, so you can work in hectares or acres, litres or gallons, and the product units that suit your operation. The app is designed to be straightforward on phone and tablet, with a clean layout and tools grouped on the home screen so common tasks are easy to find. If something is missing, incorrect, or you want a product added, you can send feedback directly from the app without setting up email on your device. Chemcalc is built for real spray work in NZ and AU conditions, with label-aware tools, saved workflows, and calculators that fit how spraying is actually planned and checked in the paddock or on the road.

Screenshots

HTML Viewer Pro4 screens
Chemcalc4 screens

Verdict

The call

The clearest difference is ads: Chemcalc at none against HTML Viewer Pro's shown. Chemcalc also leads on update cadence (fortnightly vs every 15 months). HTML Viewer Pro's advantage is iOS requirement (12.0 vs 15.0). On price, in-app purchases and device support there is nothing between them.

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. HTML Viewer Pro sells 2 in-app purchases, starting at $1.99 per month and Chemcalc sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

HTML Viewer Pro ships an update every 15 months, Chemcalc fortnightly. The most recent releases landed on October 24, 2026 and October 3, 2026 respectively.

Scorecard3 real differences · 7 level
HTML Viewer Pro versus Chemcalc: the parameters behind the verdict, then further details
ParameterHTML Viewer ProChemcalc
PriceFreeFree
Rating3.9 (45 ratings) — better—
Positive reviews49.1% of reviews—
Number of ratings45 — better—
Update frequencyEvery 15 monthsFortnightly — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better15.0
Further details — not scored
Size33 MB54 MB
Age rating17+4+
DeveloperHayato ShimizuF-JAP INDUSTRIES LIMITED

In-app purchases

2 purchases

HTML Viewer Pro

Subscriptions1
  • Premium (Monthly plan)$1.991 Month
One-time1
  • Premium (Buying out)$19.99
1 purchases

Chemcalc

One-time1
  • Ad removal$9.99

Questions

Is HTML Viewer Pro free?
HTML Viewer Pro is free to download, with in-app purchases available.
Is Chemcalc free?
Chemcalc is free to download, with in-app purchases available.
Do HTML Viewer Pro or Chemcalc have ads?
HTML Viewer Pro shows ads; Chemcalc does not.
Which is updated more often, HTML Viewer Pro or Chemcalc?
HTML Viewer Pro ships an update every 15 months, and Chemcalc fortnightly. Most recently, HTML Viewer Pro was updated on October 24, 2026 and Chemcalc on October 3, 2026.

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