Comparison

TLV ToolBox vs Fit Tolerance ISO

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

Head to head
About

TLV ToolBox

This utility app transforms your mobile device into a portable steam calculation tool. It assists with onsite calculations for control valve stations, condensate recovery systems, and various maintenance tasks, reducing the need for multiple trips.

Highlights
  • Steam Tables (saturated and superheated)
  • Steam Pipe Sizing
  • Condensate Pipe Sizing
  • Heating Calculations
  • Cv and Kv Values
  • Stall Point
Features
Read full description

Turn your mobile device into a light & portable steam calculation tool with TLV Toolbox. Reduce trips back and forth while working onsite with this valuable tool. Helpful for design or everyday maintenance of control valve stations, condensate recovery systems, and much more! ************************* FEATURES: - Steam Tables (saturated and superheated) - Steam Pipe Sizing - Condensate Pipe Sizing - Heating Calculations - Cv and Kv Values - Stall Point - and more... ************************* * About Us * TLV is internationally established, with companies in 13 countries. A network of over 100 distributors in more than 50 countries enables the speedy provision of engineering support throughout the world. TLV plays a leading role in the promotion of efficient energy systems and increased environmental conservation on a worldwide scale through its original products and services. For further information visit: www.tlv.com Contact us: https://www.tlv.com/global/US/contact-us/contact-form.html

About

Fit Tolerance ISO

Calculates engineering tolerances for various mechanical components based on ISO and ANSI standards. It determines size limits, deviations, and fit types for holes and shafts, offering schematic representations of fits.

Highlights
  • Calculates engineering tolerances
  • Supports ISO and ANSI standards
  • Determines clearance, transition, and interference fits
  • Provides schematic fit representations
  • Includes preferred tolerances and fits
  • Works with metric units
Features
Read full description

Limits, fits and tolerances calculator has been developed to calculate engineering tolerances of inner and outer features of journal bearings, linear bearings, thrust bearings, bushings, ball bearings, roller bearings, housings, cylinder bores, drilled holes, linear and precision shafts, pistons, etc. The calculator works in line with ISO 286-1 (2010), ISO 286-2 (2010) and ANSI B4.2 (1978) standards which are based on metric units. According to the input parameters of nominal size and hole/shaft tolerances, size limits and deviations for hole/shaft are calculated and fit type is selected among the clearance, transition and interference fits. The schematic representation of the fit is also drawn. The preferred tolerances and fits advised by ISO and ANSI standards can be found in the "Supplements" section.

Screenshots

TLV ToolBox4 screens
Fit Tolerance ISO4 screens

Verdict

The call

The clearest difference is rating: Fit Tolerance ISO at 5.0 against TLV ToolBox's 4.5. TLV ToolBox's advantage is ads (none vs shown) and update cadence (every 4 months vs every 12 months). On price, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Fit Tolerance ISO holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 8 and 2 respectively.

UpkeepUpdate frequency

TLV ToolBox ships an update every 4 months, Fit Tolerance ISO every 12 months. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.

Scorecard6 real differences · 4 level
TLV ToolBox versus Fit Tolerance ISO: the parameters behind the verdict, then further details
ParameterTLV ToolBoxFit Tolerance ISO
PriceFreeFree
Rating4.5 (8 ratings)5.0 (2 ratings) — better
Positive reviews75.0% of reviews—
Number of ratings8 — better2
Update frequencyEvery 4 months — betterEvery 12 months
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree — betterAd-supported
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.3 — better15.0
Further details — not scored
Size4 MB51 MB
Age rating4+4+
DeveloperTLV CO.,LTD.Yasar Yucel Yesilbag

Customer experience

TLV ToolBox

All ratings8 ratings
Positive87.5%
Neutral12.5%
Negative0.0%
Written reviews8 reviews
Positive75.0%
Neutral12.5%
Negative12.5%

Fit Tolerance ISO

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

In-app purchases

None

TLV ToolBox

No in-app purchases

None

Fit Tolerance ISO

No in-app purchases

Questions

Is TLV ToolBox free?
TLV ToolBox is free to download, with no in-app purchases.
Is Fit Tolerance ISO free?
Fit Tolerance ISO is free to download, with no in-app purchases.
Which has better reviews, TLV ToolBox or Fit Tolerance ISO?
Fit Tolerance ISO is rated higher. TLV ToolBox averages 4.5 out of 5 from 8 ratings, while Fit Tolerance ISO averages 5.0 from 2 ratings.
Do TLV ToolBox or Fit Tolerance ISO have ads?
Fit Tolerance ISO shows ads; TLV ToolBox does not.
Which is updated more often, TLV ToolBox or Fit Tolerance ISO?
TLV ToolBox ships an update every 4 months, and Fit Tolerance ISO every 12 months. Most recently, TLV ToolBox was updated on November 6, 2026 and Fit Tolerance ISO on November 2, 2026.

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