Fastener Calc vs Markdown+ Text & Code Editor
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fastener Calc
This app provides engineers, technicians, and students with essential tools for bolted joint development. It includes converters for various units and geometrical and mechanical calculators for dimensioning and design in joining technology.
- Unit converters (length, torque, pressure, force)
- Metric-imperial fastener conversion
- Drill hole size calculator
- Tapping screw pilot hole design
- Bolt size and property class estimation
- Disc spring calculator
- Thread engagement length calculator
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Bossard - Proven Productivity Bossard calculators and converters are designed for engineers, technicians, designers and students involved in the development and assembly of bolted joint. Calculators categories: * Converters are used for converting different units of measure, such as lengths, hardnesses, pressures etc. The converters are divided into topic areas to enable the most efficient selection possible. --- Length converter is used for converting more than 68 different units of measure, such as inch, centimetre, metre, mile, foot, yard etc. --- Torque converter is used for converting different torques, such as newton metre, dyne metre, kilogram force metre, ounce force inch etc. --- Pressure converter is used for converting different pressure units, such as bar, millibar, psi, pascal etc. --- Force converter is used for converting different force units, such as newton, dyne, kilogram force, ounce force etc. --- Metric - imperial units fasteners converter. Converting between metric and inch fasteners forces you to make compromises.This converter gives you best proposals and will show you the differences in an easy way. --- Hardnes converter. Conversion of hardness-to-hardness or hardness-to-tensile-strength values for unalloyed and low-alloy steels and cast iron. * Geometrical calculators are used for dimensioning and implementation in the joining technology. --- Drill hole size for tapped threads. Calculate the proper tap drill size for the most commonly used screws. --- Pilot hole design for tapping screws. Calculate core hole diameters for tapping screws (Based on DIN 7975:1989) --- Pilot hole design for ecosyn®-Plast. Calculate the boss geometry for various types of thermoplastics for ecosyn®-plast. --- Tolerances for shafts and holes. Find and calculate tolerances for holes and shafts. Based on standard tolerance classes and limit deviations from ISO 286-2:2010 * Mechanical calculators are used for dimensioning and designing in the joining technology. --- Estimation of bolt size and property class. Which dimension and strength should a bolt have for my application? Estimate the required diameter and property class. Based on VDI 2230:2014. --- Disc spring calculator. Calculate disc springs with geometry and properties according to DIN 2093. Calculations based on DIN 2092. --- Cost savings calculator. Calculate savings potential for fasteners by looking at activity costs. --- Thread engagement length calculator. Calculate the theoretical minimum required thread engagement length for blind hole and through hole applications. Based on VDI 2230:2014 --- Torque and preload with nut factor. Calculate tightening torque and preload with nut factor for inch screws. Based on formula T = D*K*F. --- Torque and preload with nut factor and tool accuracy - imperial system. Calculate tightening torque and preload with nut factor for inch screws. The calculation considers tool accuracy and scatter on preload. --- Torque and preload with nut factor and tool accuracy - metric. Calculate tightening torque and preload with nut factor for metric screws. The calculation considers tool accuracy and scatter on preload. Based on formula T = D*K*Fmean --- Torque and preload with friction scatter. Calculate tightening torque and preload for hex head and socket head screws. The calculation considers friction scatter, tool accuracy and scatter on preload. Based on VDI 2230:2014 --- Torque and preload for customized geometry and material. Calculate tightening torque, preload and surface pressure for hex head, socket head and countersunk screws. Customized head shapes, hole chamfers, reduced shanks and materials are available options. Based on VDI 2230:2014 --- Torque and preload calculator. Calculate tightening torque, preload and surface pressure for hex head and socket head screws. Based on VDI 2230:2014.
Markdown+ Text & Code Editor
This native editor offers real-time Markdown and LaTeX rendering with dynamic variables for complex calculations and reusable components. Enjoy a distraction-free interface, seamless cross-device syncing, and advanced code highlighting across Apple devices.
- Real-time Markdown and LaTeX previews
- Dynamic variables for calculations
- Code highlighting for 140+ languages
- Split-view editing
- Seamless cross-device syncing
- Dark mode and custom themes
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Introducing the native, real-time Markdown editor with superpowers. Markdown+ has been meticulously crafted for Vision Pro, iPhone, iPad, and Mac. With blazing-fast performance and powerful features like dynamic variables and real-time math rendering, Markdown+ delivers an unparalleled experience across all your Apple devices. Modern Editing Tools Experience the perfect balance of simplicity and power with our distraction-free interface. The split-view design lets you edit Markdown on one side while watching your content come alive instantly on the other—with perfect synchronized scrolling and jump-to-selection capabilities. Tables, Images, Links Easily create embed tables, images, and links, without having to memorize the markup. Live Code & Math Highlighting Create beautiful documents with advanced syntax highlighting for code blocks across 140+ programming languages. Write complex mathematical formulas with LaTeX-style syntax and watch them render in real-time with professional typesetting. Smart Variables System Transform your documents with the unique Variables feature. Create reusable components for names, dates, and complex expressions. Need to calculate sin(90)+cos(80)? Simply define it once, then reference it throughout your document—changes update everywhere automatically. Use Variables to evaluate or chain multiple mathematical expression right within your document, and use the vast library of built-in functions. Dark Mode & Custom Themes Work comfortably day or night with full dark mode support and customizable themes that perfectly complement your workflow and personal style. Performance Without Compromise Built with a native-first approach, Markdown+ delivers exceptional speed even with massive documents. Our optimized parsing engine ensures real-time previews update instantly as you type, without draining your battery or slowing down your device. Seamless Cross-Device Experience Whether you're working on Vision Pro, Mac, iPad, or iPhone, Markdown+ adapts perfectly to each screen with device-specific optimizations. Start a document on your Mac and seamlessly continue on your iPhone—your experience remains consistently excellent. One-Time Purchase, Lifetime Value No subscriptions. No in-app purchases. No hidden costs. Buy Markdown+ once and use it forever on all your devices with Family Sharing included. All future updates and features are yours at no additional cost. Learn more: EULA: https://zetegy.com/eula/markdown/ Privacy policy: https://zetegy.com/privacy/markdown/ Terms of use: https://zetegy.com/terms/markdown/
Screenshots
Verdict
The clearest difference is review sentiment: Markdown+ Text & Code Editor at 50% against Fastener Calc's 0%. Markdown+ Text & Code Editor also leads on update cadence (every 11 days vs every 4 months). Fastener Calc's advantage is in-app purchases (none vs 2) and price ($2.99 vs $9.99). On ads, monetization model 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
Fastener Calc costs $2.99 and Markdown+ Text & Code Editor $9.99 up front. Markdown+ Text & Code Editor sells 2 in-app purchases, starting at $0.99 per month. Fastener Calc asks for nothing beyond the download.
Fastener Calc ships an update every 4 months, Markdown+ Text & Code Editor every 11 days. The most recent releases landed on October 20, 2026 and October 16, 2026 respectively.
| Parameter | Fastener Calc | Markdown+ Text & Code Editor |
|---|---|---|
| Price | $2.99 — better | $9.99 |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | 50.0% of reviews — better |
| Number of ratings | 1 — better | — |
| Update frequency | Every 4 months | Every 11 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac, Vision Pro — better |
| Requires iOS | 8.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 8 MB | 35 MB |
| Age rating | 4+ | 4+ |
| Developer | Bossard AG | Zetegy LLC |
Customer experience
Fastener Calc
Markdown+ Text & Code Editor
In-app purchases
Fastener Calc
No in-app purchases
Markdown+ Text & Code Editor
- Markdown+ Monthly3 Days trial$0.991 Month
- Markdown+ Yearly14 Days trial$9.991 Year
Questions
Is Fastener Calc free?
Is Markdown+ Text & Code Editor free?
Do Fastener Calc or Markdown+ Text & Code Editor have ads?
Which is updated more often, Fastener Calc or Markdown+ Text & Code Editor?
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