Simple Hex Calc vs Fit Tolerance ISO Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Simple Hex Calc
This utility app provides IT programmers with a pocket calculator for performing arithmetic and logical operations on numbers in various bases. It offers extensive configuration options for bit length, signed/unsigned modes, and data display formats, with a reference manual included.
- Arithmetic and logical operations
- Multiple number base support (2/8/10/16)
- Bit shift, rotate, set, clear, and order operations
- Memory operations (save, load, swap)
- Configurable bit length and signed/unsigned modes
- Cut, copy, and paste results
- Reference manual included
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Simple Hex Calc is a simple pocket calculator for IT programmers. Features: * Arithmetic operations. (add, subtract, multiply, divide, modulo) * Logical operations. (not, and, or, xor, '+', '-') * Logical operations. (bit shift/rotate, bit set/clear, flip bit/byte order) * Memory operations. (clear, save, load, swap) * Switch the base 2/8/10/16 number on input. * Switch simple and extended mode by rotating device. * Switch simple and extended mode by swiping the left and right edge of screen. * Calculate the order entered. (2+2*2=8) * Cut, copy or paste the result by a tap. * Configure bit length option. (select 1 - 64 bit) * Configure signed/unsigned option. * Configure to display data format on/off option. * Configure to display data in previous base on/off option. * Configure grouping separator for BIN, OCT and HEX mode. * Configure tap sound on/off option. * Reference manual included. * Integer only. :-)
Fit Tolerance ISO Pro
Calculate engineering tolerances for various mechanical components like bearings, shafts, and housings. It adheres to ISO and ANSI standards, providing size limits, deviations, and fit types. Visual representations of fits are also generated.
- Calculate engineering tolerances
- Supports ISO and ANSI standards
- Determines clearance, transition, and interference fits
- Provides schematic fit representations
- Includes preferred tolerances and fits
- Calculates size limits and deviations
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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
Verdict
The clearest difference is review sentiment: Simple Hex Calc at 94% against Fit Tolerance ISO Pro's 50%. Simple Hex Calc also leads on update cadence (every 3 months vs every 12 months) and ratings volume (8 vs 1). Fit Tolerance ISO Pro's advantage is rating (5.0 vs 4.5). On price, ads, in-app purchases and monetization model 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
Simple Hex Calc costs $0.99 and Fit Tolerance ISO Pro $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Fit Tolerance ISO Pro holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Simple Hex Calc has 8 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 94% of Simple Hex Calc's written reviews are positive against 50% of Fit Tolerance ISO Pro's, so the app with the better star average is not the one people write more warmly about.
Simple Hex Calc ships an update every 3 months, Fit Tolerance ISO Pro every 12 months. The most recent releases landed on September 23, 2026 and August 14, 2026 respectively.
| Parameter | Simple Hex Calc | Fit Tolerance ISO Pro |
|---|---|---|
| Price | $0.99 | $0.99 |
| Rating | 4.5 (8 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 94.1% of reviews — better | 50.0% of reviews |
| Number of ratings | 8 — better | 1 |
| Update frequency | Every 3 months — better | Every 12 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.2 — better | 15.0 |
| Further details — not scored | ||
| Size | 1 MB | 47 MB |
| Age rating | 4+ | 4+ |
| Developer | Hiroki Ishiura | Yasar Yucel Yesilbag |
Customer experience
Simple Hex Calc
Fit Tolerance ISO Pro
In-app purchases
Simple Hex Calc
No in-app purchases
Fit Tolerance ISO Pro
No in-app purchases
Questions
Is Simple Hex Calc free?
Is Fit Tolerance ISO Pro free?
Which has better reviews, Simple Hex Calc or Fit Tolerance ISO Pro?
Do Simple Hex Calc or Fit Tolerance ISO Pro have ads?
Which is updated more often, Simple Hex Calc or Fit Tolerance ISO Pro?
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