Comparison

ISO Fits vs VS Watch

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

VS Watch

Stream Build DRO data directly to your iOS watch. This app offers level mode for zeroing out the DRO and allows switching between average/continuous trigger types. Advanced settings are accessible via the login screen.

Highlights
  • Direct connection to Build DRO
  • Stream data to iOS watch
  • Level Mode for zeroing DRO
  • Switch trigger types (Average/Continuous)
  • Access advanced settings
Read full description

With the Verisurf Watch App, you can directly connect and stream the Build DRO directly to your iOS watch device. Level Mode - Tap the Verisurf Icon to Zero out the DRO. Average/Continuous - Tap the "Tap-Measure" text to switch Trigger types. Advance Settings - Tap the Verisurf Icon in the Login screen to expose advanced user settings.

Screenshots

ISO Fits4 screens

Verdict

The call

The clearest difference is rating: VS Watch at 5.0 against ISO Fits's 4.2. VS Watch also leads on in-app purchases (none vs 1) and update cadence (every 2 days vs every 5 months). ISO Fits's advantage is ratings volume (6 vs 2). On price, ads 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. ISO Fits sells 1 one-off in-app purchase. VS Watch asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

VS Watch holds the better App Store score, 5.0 against 4.2. Both are backed by a comparable volume of ratings — 6 and 2 respectively.

UpkeepUpdate frequency

ISO Fits ships an update every 5 months, VS Watch every 2 days. The most recent releases landed on October 16, 2026 and October 6, 2026 respectively.

Scorecard6 real differences · 4 level
ISO Fits versus VS Watch: the parameters behind the verdict, then further details
ParameterISO FitsVS Watch
PriceFreeFree
Rating4.2 (6 ratings)5.0 (2 ratings) — better
Positive reviews94.6% of reviews—
Number of ratings6 — better2
Update frequencyEvery 5 monthsEvery 2 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPod, Apple Watch
Requires iOS15.613.0 — better
Further details — not scored
Size66 MB2 MB
Age rating4+4+
DeveloperTrelleborg Sealing SolutionsVerisurf

Customer experience

ISO Fits

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

VS Watch

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

ISO Fits

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

VS Watch

No in-app purchases

Questions

Is ISO Fits free?
ISO Fits is free to download, with in-app purchases available.
Is VS Watch free?
VS Watch is free to download, with no in-app purchases.
Which has better reviews, ISO Fits or VS Watch?
VS Watch is rated higher. ISO Fits averages 4.2 out of 5 from 6 ratings, while VS Watch averages 5.0 from 2 ratings.
Do ISO Fits or VS Watch have ads?
Neither ISO Fits nor VS Watch shows ads.
Which is updated more often, ISO Fits or VS Watch?
ISO Fits ships an update every 5 months, and VS Watch every 2 days. Most recently, ISO Fits was updated on October 16, 2026 and VS Watch on October 6, 2026.

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