SubStandard vs GRF Snowtam
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SubStandard
This aviation utility app simplifies applying cold temperature corrections for altitudes. It allows users to save frequently used altitude sets for rapid retrieval, enhancing efficiency in flight planning.
- Cold temperature corrections
- Altitude set storage
- Quick access to saved altitudes
- Easy to use interface
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SubStandard is an easy to use app to apply cold temperature corrections in aviation. Moreover, it lets you store sets of altitudes for quick access later on.
GRF Snowtam
Decode aviation weather reports with this tool. It handles Global Reporting Format (GRF) and older Snowtam formats, converts visibility and temperature units, and calculates altitude corrections for cold weather.
- GRF decoder
- Snowtam decoder
- MOTNE decoder
- Visibility converter
- Temperature converter
- Altitude correction calculator
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Complete and Accurate GRF decoder (New format GRF - global reporting format) to decode RCAM. Complete and Accurate Snowtam decoder (old format - used in Russia). MOTNE Decoder (Old format for Runway Condition Code) Converter for U.S. Visibility SM/m table, and temperatures Altitude correction calculator for cold Temperatures enjoy!
Screenshots
Verdict
The clearest difference is price: SubStandard at Free against GRF Snowtam's $1.99. SubStandard also leads on rating (5.0 vs 1.0) and iOS requirement (12.0 vs 15.6). On review sentiment, ratings volume, update cadence and ads 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
SubStandard is free to download; GRF Snowtam costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
SubStandard holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews split almost evenly too, at 0% and 0% positive.
SubStandard ships an update every 7 months, GRF Snowtam every 4 months. Both last shipped on November 3, 2026.
| Parameter | SubStandard | GRF Snowtam |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 5.0 (2 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| Number of ratings | 2 — better | 1 |
| Update frequency | Every 7 months | Every 4 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 33 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | iService Ottner Röck | Pedro Isidoro |
Customer experience
SubStandard
GRF Snowtam
In-app purchases
SubStandard
No in-app purchases
GRF Snowtam
No in-app purchases
Questions
Is SubStandard free?
Is GRF Snowtam free?
Which has better reviews, SubStandard or GRF Snowtam?
Do SubStandard or GRF Snowtam have ads?
Which is updated more often, SubStandard or GRF Snowtam?
Other comparisons
