O vs Metal +
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
O
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Everything you always wanted to know about the O-Ring ! Type in our app the engraved number and verify the authenticity of your O-Ring. You’ll access in no time to the part number, dimensions, compound, guarantee of origin and date of manufacturing! NOW DARE TO ASK !!! • Traceability • Guarantee of Origin • Unit Identification • Detect Counterfeiting
Metal +
Easily calculate the weight and price of various metal forms and alloys. Save your projects and access calculations offline. This tool supports multiple units and metal types for precise results.
- Calculate weight of round, sheet, tube, rectangle forms
- Supports steel, aluminum, nickel, copper, gold, silver alloys
- Calculate paint surface area
- Weight converter
- Price per kilogram/ton converter
- Save items and projects
- Offline functionality
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Metal+ can calculate the weight of any metal form, such as round, sheet, tube, rectangle, and much more. Metal alloys such as steel, aluminum, nickel, copper, gold, silver, and others are supported, and paint surface calculation is performed. To find out how many pieces and how long they are, use the Weight Converter. Calculate price per kilogram / ton from piece price using a price converter. Save items and projects to your favorite list. No need internet (work offline). No background processes. Fast and simple. Less clicks. Accurate results. Remembers your settings for next use. Privacy protected no personal info is collected.
Screenshots
Verdict
The clearest difference is in-app purchases: O at none against Metal +'s 1. Metal +'s advantage is update cadence (every 4 months vs every 18 months). On price, ads, device support 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
Both are free to download. Metal + sells 1 one-off in-app purchase. O asks for nothing beyond the download.
O ships an update every 18 months, Metal + every 4 months. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.
| Parameter | O | Metal + |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.8 (12 ratings) — better |
| Number of ratings | — | 12 — better |
| Update frequency | Every 18 months | Every 4 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 16 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | HUTCHINSON | Mohamed Saad |
In-app purchases
O
No in-app purchases
Metal +
- Remove Ads$4.99
Questions
Is O free?
Is Metal + free?
Do O or Metal + have ads?
Which is updated more often, O or Metal +?
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