Comparison

ISO Fits vs Metal World

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

Head to head
About

ISO Fits

Calculate ISO fits and tolerances for shafts and bores. Supports metric and inch units, displays detailed fit definitions, and includes visual charts and educational videos.

Highlights
  • ISO fits calculation
  • Tolerance class display
  • Metric/inch unit switching
  • Tolerance charts
  • Updated YouTube videos
Features
Read full description

It includes the following features: - Fits calculation: Upon entering the nominal diameter (of either bore or shaft), users select their tolerance classes for bore and shaft. The app then provides the complete ISO fits definition with all relevant values. - Tolerances: Shows the tolerances for the most commonly used ISO tolerance classes. - switch between metric and inch version. - Charts: Shows the most common ISO tolerances classes in a diagram. - Videos: Features the automatically updated latest TSS youtube videos. The results of this application are based on DIN ISO 286 Nominal dimension: 1-3150mm following tolerances included: Shaft: a9, a10, a11, a12, a13, b8, b9, b10, b11, b12, b13, c8, c9, c10, c11, c12, cd5, cd6, cd7, cd8, cd9, cd10, d5, d6, d7, d8, d9, d10, d11, d12, d13, e5, e6, e7, e8, e9, e10, ef3, ef4, ef5, ef6, ef7, ef8, ef9, ef10, f3, f4, f5, f6, f7, f8, f9, f10, fg3, fg4, fg5, fg6, fg7, fg8, fg9, fg10, g3, g4, g5, g6, g7, g8, g9, g10, h1, h2, h3, h4, h5, h6, h7, h8, h9, h10, h11, h12, h13, h14, h15, h16, h17, h18, js1, js2, js3, js4, js5, js6, js7, js8, js9, js10, js11, js12, js13, js14, js15, js16, js17, js18, j5, j6, j7, j8, k3, k4, k5, k6, k7, k8, k9, k10, k11, k12, k13, m3, m4, m5, m6, m7, m8, m9, n3, n4, n5, n6, n7, n8, n9, p3, p4, p5, p6, p7, p8, p9, p10, r3, r4, r5, r6, r7, r8, r9, r10, s3, s4, s5, s6, s7, s8, s9, s10, t5, t6, t7, t8, u5, u6, u7, u8, u9, v5, v6, v7, v8, x5, x6, x7, x8, x9, x10, y6, y7, y8, y9, y10, z6, z7, z8, z9, z10, z11, za6, za7, za8, za9, za10, za11, zb7, zb8, zb9, zb10, zb11, zc7, zc8, zc9, zc10, zc11 Bore: A9, A10, A11, A12, A13, B8, B9, B10, B11, B12, B13, C8, C9, C10, C11, C12, C13, CD6, CD7, CD8, CD9, CD10, D6, D7, D8, D9, D10, D11, D12, D13, E5, E6, E7, E8, E9, E10, EF3, EF4, EF5, EF6, EF7, EF8, EF9, EF10, F3, F4, F5, F6, F7, F8, F9, F10, FG3, FG4, FG5, FG6, FG7, FG8, FG9, FG10, G3, G4, G5, G6, G7, G8, G9, G10, H1, H2, H3, H4, H5, H6, H7, H8, H9, H10, H11, H12, H13, H14, H15, H16, H17, H18, JS1, JS2, JS3, JS4, JS5, JS6, JS7, JS8, JS9, JS10, JS11, JS12, JS13, JS14, JS15, JS16, JS17, JS18, J6, J7, J8, J9, K3, K4, K5, K6, K7, K8, K9, K10, M3, M4, M5, M6, M7, M8, M9, M10, N3, N4, N5, N6, N7, N8, N9, N10, N11, P3, P4, P5, P6, P7, P8, P9, P10, R3, R4, R5, R6, R7, R8, R9, R10, S3, S4, S5, S6, S7, S8, S9, S10, T5, T6, T7, T8, U5, U6, U7, U8, U9, U10, V5, V6, V7, V8, X5, X6, X7, X8, X9, X10, Y6, Y7, Y8, Y9, Y10, Z6, Z7, Z8, Z9, Z10, Z11, ZA6, ZA7, ZA8, ZA9, ZA10, ZA11, ZB7, ZB8, ZB9, ZB10, ZB11, ZC7, ZC8, ZC9, ZC10, ZC11

About

Metal World

Quickly calculate the weight of various metal and plastic materials in numerous formats. Supports nearly 300 materials and 22 shapes, providing results per unit or total weight. Also offers material comparison and specific weight displays.

Highlights
  • Weight calculation for ~300 materials
  • Supports 22 formats (sheets, bars, tubes, etc.)
  • Results per kg/m, m², or item
  • Specific weight display
  • Material comparison with EN/DIN standards
  • Information on special materials
Features
Read full description

*This app lifts almost any weight* BIKAR-METALLE GmbH is one of the world's leading suppliers to trade and industry. For 50 years, our name has stood for quality, expertise, choice, precision and reliability in the field of NF metals and plastics. We supply: Materials: - Aluminium / Aluminum - Copper - Brass - Bronze - Plastics - Special materials Formats available: - Sheets & plates - Bars & tubes - Round blanks & rings - Bushings - Profiles - Pre-cuts - Parts from drawings Why this app: We have created this app to fulfill our customers’ frequent request to be able to calculate the weights of materials quickly and easily. This extends right across our range of products. Easily calculate the weight of almost 300 different materials and elements in 22 currently specified formats. The app can: calculate weights made from almost 300 materials and elements for: Rolled and cast materials: - sheets / plates / cuttings / rings / circular blanks Bars: - round / square / flat / hexagonal / octagonal / double hexagonal Tubes: - round / square / hexagonal – angular and round-hole / bushings / hollow bars Profiles: - angle (L) / T / U / Z / double T Special shapes - Spheres Results: Weights: per kg/m or m² ● per item ● total weight For tubular forms, calculate the missing dimensions For semi-circular bars (sector of a circle), chord / height / diameter Display specific weights: The specific weights are displayed for all materials and elements. Compare materials: In the case of non-ferrous metals, EN standards are observed as well as many comparable standards according to DIN, UNI (Italy), BS (British Standard), AFNOR (France), and from Spain, Sweden and Norway. However, some of these are only similar. Materials for tool-making, mould-making and model-making: You can also find special materials for tool-making, mould-making and model-making, such as FORMODAL®, UNIDAL® or CERTAL®. Miscellaneous: Simply weigh a ball of fresh snow, an oak beam, or a wedding ring made of pure gold. There’s so much that you could weigh. Information: About BIKAR-METALLE GmbH Route planner Feedback and much more. The team at BIKAR-METALLE GmbH hopes you enjoy using the app. BIKAR-METALLE GmbH Industriestr. 3 - 17 57319 Bad Berleburg GERMANY Tel.: +49-2751-9551111 info@bikar.com www.bikar.com

Screenshots

ISO Fits4 screens
Metal World4 screens

Verdict

The call

The clearest difference is rating: Metal World at 4.8 against ISO Fits's 4.2. Metal World also leads on in-app purchases (none vs 1) and update cadence (every 2 months vs every 5 months). On price, review sentiment, ratings volume 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. ISO Fits sells 1 one-off in-app purchase. Metal World asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Metal World holds the better App Store score, 4.8 against 4.2. Both are backed by a comparable volume of ratings — 6 and 5 respectively. Written reviews point the same way: 95% of ISO Fits's written reviews are positive against 100% of Metal World's.

UpkeepUpdate frequency

ISO Fits ships an update every 5 months, Metal World every 2 months. The most recent releases landed on November 6, 2026 and November 1, 2026 respectively.

Scorecard5 real differences · 5 level
ISO Fits versus Metal World: the parameters behind the verdict, then further details
ParameterISO FitsMetal World
PriceFreeFree
Rating4.2 (6 ratings)4.8 (5 ratings) — better
Positive reviews94.6% of reviews100.0% of reviews — better
Number of ratings6 — better5
Update frequencyEvery 5 monthsEvery 2 months — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.65.1.1 — better
Further details — not scored
Size66 MB37 MB
Age rating4+4+
DeveloperTrelleborg Sealing SolutionsBIKAR-METALLE GmbH

Customer experience

ISO Fits

All ratings6 ratings
Positive83.3%
Neutral0.0%
Negative16.7%
Written reviews37 reviews
Positive94.6%
Neutral0.0%
Negative5.4%

Metal World

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

ISO Fits

One-time1
  • Full Version with complete ISO286 Standard$1.99
None

Metal World

No in-app purchases

Questions

Is ISO Fits free?
ISO Fits is free to download, with in-app purchases available.
Is Metal World free?
Metal World is free to download, with no in-app purchases.
Which has better reviews, ISO Fits or Metal World?
Metal World is rated higher. ISO Fits averages 4.2 out of 5 from 6 ratings, while Metal World averages 4.8 from 5 ratings.
Do ISO Fits or Metal World have ads?
Neither ISO Fits nor Metal World shows ads.
Which is updated more often, ISO Fits or Metal World?
ISO Fits ships an update every 5 months, and Metal World every 2 months. Most recently, ISO Fits was updated on November 6, 2026 and Metal World on November 1, 2026.

Other comparisons