BendMarks vs Sixteenths
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BendMarks
This app calculates conduit bending, voltage drop, and fill capacities for electrical work. It provides detailed formulas and diagrams for each calculation, helping users understand the underlying math. Designed for field use with offline functionality and glove-friendly controls.
- Conduit bending calculations with diagrams
- Voltage drop analysis
- Conduit fill calculations
- Box fill calculations
- Step-by-step formula explanations
- Offline functionality
- Support for multiple NEC code cycles
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The conduit and code calculator that shows its work. Most calculators hand you a number and expect you to trust it. BendMarks gives you the number, the formula behind it, your own values substituted into that formula, and a labeled diagram of the bend. Check the math on the tailgate. Hand the phone to an apprentice and walk them through it. Catch the mistake before you cut. For the electrician who wants to know why the math works, and the apprentice still learning it. WHAT IT DOES Conduit bending: offset, rolling offset, 3-point saddle, 4-point saddle, 90 degree stub-up and kick bends, each with a labeled diagram and exact mark distances. Voltage drop: single-phase and three-phase, copper or aluminum, with a clear pass or fail against the NEC 3% and 5% targets. Conduit fill: NEC Chapter 9 percentages, drawn as a cross section for any mix of wire. Box fill: NEC 314.16(B) for conductors, devices, grounds and clamps. Obstruction planner: give it the real pipe or wide obstruction in front of you and it returns the bend marks. Apprentice drill mode: random bend problems that make you commit to an answer before they reveal the math. Show your work: every result opens into the formula with your numbers in it, explained in plain language, so you learn the math while you use it. Built for the field: oversized tap targets for gloved hands, a fraction-native keypad, and a sunlight mode that thickens every line so the diagrams hold up in direct sun. Recents: your last 20 calculations, one tap away. WHAT IT DOES NOT DO No ads. No subscription. No account to create. No tracking, and no advertising identifier. One payment, and the whole app is yours. Every calculator runs offline, so a dead zone in a basement or a mechanical room changes nothing. Your measurements and results stay on the phone. The app reports crashes and performance problems so the next version breaks less, and that is the only thing it ever sends. Sources: Benfield's Conduit Bending and Fabrication, Ugly's Electrical References, NEC 2023 Chapter 9. Every NEC value is cited to its section. This is a learning and field reference tool, not a substitute for code review or professional judgment. Always verify against your local code and a licensed electrician.
Sixteenths
This app simplifies complex construction calculations by handling feet, inches, and fractions accurately. It offers specialized solvers for common jobsite tasks like stairs, roof pitch, and concrete, with results saved automatically for easy recall. It's designed for offline use and provides a one-time purchase for full access.
- Exact fraction math for feet and inches
- Ten jobsite solvers (stairs, roof pitch, etc.)
- Automatic result saving and naming
- Offline functionality
- One-time purchase, no subscription
- Conversions to yards, meters, mm, board feet
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Sixteenths turns tape-measure math into instant answers. Type 12' 6-3/4" the way you say it, get exact fractions back, and cut it right the first time. Built for carpenters, framers, electricians, remodelers, and anyone who thinks in feet and inches. Stop scribbling math on drywall. Stop trusting a phone calculator that turns 3/16" into 0.1875 and rounds your cut wrong. Sixteenths does construction math the way the trades actually work — try it free, and keep it on whatever terms suit you. ► EXACT FRACTION MATH Feet, inches, and fractions are first-class keys Every value stays a true fraction — never off by a 1/16" Resolutions from 1/2 down to 1/64 Instant conversions: yards, meters, cm, mm, board feet ► NEW: CONDUIT BENDING* Offsets, 90° stubs, 3- and 4-point saddles, rolling offsets Every mark measured from the conduit end, in sixteenths Tells you which bender mark to line up — arrow or rim notch Multipliers and take-ups straight from the Klein and Greenlee charts 1/2" to 1-1/4" EMT, bends from 10° to 60° ► TEN JOBSITE SOLVERS* Stairs — risers, treads, stringer, opening from one measurement Roof Pitch — pitch, angle, rise, run, diagonal Hip & Jacks — hip/valley length and every jack cut to length Conduit Bending — offsets, stubs, and saddles marked to Concrete — yards, bags, waste, and what to order Balusters, Circle & Arc, Compound Miter, Materials, Boa ► A TAPE THAT REMEMBERS* Every calculator result saved automatically, with its exact value Name the numbers that matter — "Stair riser," "Garage s Recall them days later, still dead on ► BUILT FOR THE JOBSITE Works fully offline — basement, crawlspace, forty minut No account, no sign-in, no ads, no tracking Your numbers never leave your phone ► WHO IT'S FOR Carpenters, framers, electricians, GCs, remodelers, deck builders, stair builders, roofers, concrete crews, finish carpenters, serious DIYers — anyone who measures in sixteenths. *Solvers and the tape are part of Sixteenths Pro. ► FREE TO TRY. YOURS ON YOUR TERMS. Download and start calculating — no card, no account. The calculator gives you ten free calculations to prove the math before it asks for anything. Sixteenths Pro unlocks unlimited calculations, all ten • Yearly — $49.99/year, with a 3-day free trial • Monthly — $4.99/month, cancel anytime • Lifetime — $99.99 once, yours forever Every plan includes every solver we add after it. Tied to your Apple ID, restores free on any new device. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in your Apple ID settings. Built for the tool pouch. Download Sixteenths and measu Questions? support@sixteenthsapp.com Privacy Policy: https://www.sixteenthsapp.com/privacy Terms of Use: https://www.sixteenthsapp.com/terms
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Verdict
The clearest difference is price: Sixteenths at Free against BendMarks's $14.99. Sixteenths also leads on update cadence (every 4 days vs every 3 weeks) and iOS requirement (16.4 vs 18.0). BendMarks's advantage is rating (5.0 vs 3.7) and in-app purchases (none vs 1). On ratings volume, 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
Sixteenths is free to download; BendMarks costs $14.99 up front. Sixteenths sells 1 one-off in-app purchase. BendMarks asks for nothing beyond the download.
BendMarks holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 2 and 3 respectively.
BendMarks ships an update every 3 weeks, Sixteenths every 4 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.
| Parameter | BendMarks | Sixteenths |
|---|---|---|
| Price | $14.99 | Free — better |
| Rating | 5.0 (2 ratings) — better | 3.7 (3 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 2 | 3 — better |
| Update frequency | Every 3 weeks | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 18.0 | 16.4 — better |
| Further details — not scored | ||
| Size | 2 MB | 46 MB |
| Age rating | 4+ | 4+ |
| Developer | BigBalli Consulting llc | Dreamer Apps |
In-app purchases
BendMarks
No in-app purchases
Sixteenths
- Sixteenths Pro$39.99
Questions
Is BendMarks free?
Is Sixteenths free?
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