Comparison

SUN vs Material Numbers

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

Head to head

About

SUN

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The SUN-TEC Hardness Converter is a tool for converting data from one hardness scale to another scale(s) and measuring the hardness of Metallic materials for your applications. Features and Benefits: - Convert between Rockwell, Vickers, Knoop, Brinell, and Leeb hardness scales. - Minimum Thickness and Cylindrical corrections for Rockwell scales. - Diagonal Length(s) conversion to Hardness and Hardness to Diagonal Length(s) for Vickers, Knoop, and Brinell scales. Available Scales: - HRA - HRB - HRC - HRD - HRF - HR15N - HR30N - HR45N - HR15T - HR30T - HR45T - VICKERS - KNOOP - BRINELL - LEEB (HLD) Note: All information within this application tool is for reference only.

About

Material Numbers

Features

Read full description

M Numbers: Quick lookup of base metal weldability grouping numbers (Material Numbers) for welding procedure and performance qualification. Data is provided by C-spec from the master source used for generation, proof-reading and maintenance of AWS B2.1 Table C.1 and C.2.

Screenshots

SUN4 screens

Material Numbers4 screens

Verdict

The call

The clearest difference is update cadence: Material Numbers at every 2 days against SUN's every 14 months. Material Numbers also leads on device support. On price, in-app purchases and iOS requirement 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

SUN ships an update every 14 months, Material Numbers every 2 days. The most recent releases landed on September 25, 2026 and September 29, 2026 respectively.

Scorecard2 real differences · 4 level

SUN versus Material Numbers: the parameters behind the verdict, then further details
Parameter	SUN	Material Numbers
Price	Free	Free
Update frequency	Every 14 months	Every 2 days — better
Ads	—	No
In-app purchases	No	No
Devices	—	iPhone, iPad, iPod — better
Requires iOS	13.4	13.0 — better
Further details — not scored
Size	24 MB	14 MB
Age rating	17+	4+
Developer	SUN-TEC CORPORATION	ASMEIX CORPORATION

In-app purchases

None

SUN

No in-app purchases

None

Material Numbers

No in-app purchases

Questions

Is SUN free?

SUN is free to download, with no in-app purchases.

Is Material Numbers free?

Material Numbers is free to download, with no in-app purchases.

Which is updated more often, SUN or Material Numbers?

SUN ships an update every 14 months, and Material Numbers every 2 days. Most recently, SUN was updated on September 25, 2026 and Material Numbers on September 29, 2026.