Comparison

Hammer Construction Calculator vs K4 Tools

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

Head to head
About

Hammer Construction Calculator

This app provides advanced construction calculations, including feet-inch-fraction math and specialized tools for various trades. It also offers material takeoff and PDF quote generation, with features for jobsite planning and notes.

Highlights
  • Feet-inch-fraction math with metric conversion
  • 20 specialized trade calculators with diagrams
  • Material takeoff and PDF quote generation
  • Jobsite plans and notes with blueprint support
  • Offline functionality
  • Customizable rounding and unit support
Read full description

The construction calculator that finishes the job: feet-inch-fraction math, 20 trade calculators, and a material takeoff that turns into a professional PDF quote — all in one app. WHY PROS SWITCH TO HAMMERCALC FEET-INCH-FRACTION MATH, DONE RIGHT - Mix feet, inches, millimeters, and meters in one calculation - Tape-measure fraction strip: tap or slide to enter 1/16s faster than typing - Results in feet-inches AND metric, side by side - Custom rounding: 1/16", 1/32", 1/64", or decimal 20 TRADE CALCULATORS — EACH WITH A LIVE DIAGRAM - Framing: rafters (hip/valley/jack cut lists, birdsmouth), roof squares & flashing, wall framing with stud counts, rake walls - Stairs: rise, run, stringers — with IRC code checks built in (max riser, tread, headroom, 2R+T comfort) - Outdoor: decks, fences (incl. chain-link), concrete bags/yards/rebar, baluster spacing (4" sphere rule) - Finishes: drywall, paint, tile, flooring, siding - Layout & lumber: square footage with cutouts, board feet & cost, cut list optimizer (fewest boards, least waste), compound miter/crown, triangle & pitch, circle/arc layout - Every field label explains itself — long-press for a diagram FROM CALCULATION TO QUOTE — NO OTHER CALCULATOR DOES THIS - One tap sends any tool's material list to a project takeoff - Buy-list smarts: rounds up to lengths the yard actually sells, never orders short - Check off materials on site as you load the truck - Price book remembers what you paid last time - Add labor, markup, and tax — export a branded PDF quote with your logo - Share as PDF, CSV, or plain text PLANS & NOTES ON THE JOBSITE - Load blueprint PDFs and photos — auto-saves your page, zoom, and position - Job notes with one-tap capture of any calculation - Quick links to your building codes and span tables BUILT FOR THE FIELD - Works fully offline. No ads. No popups. No data collection. - Dark mode for early starts, haptic keys, 12 accent colors - English & Español — switch live in Settings - iPhone, iPad, and Mac PERFECT FOR Carpenters • Framers • Contractors • Remodelers • Deck builders • Estimators • Engineers • Machinists • Architects • Serious DIYers TRY IT FREE FOR 7 DAYS Full access to everything. No commitment — cancel anytime. A subscription is required after the trial. Auto-renews unless canceled 24 hours before the period ends. Manage or cancel in Settings > [Your Apple ID] > Subscriptions. Support: hammercalc@gmail.com Terms: https://www.hammerstorm.co/terms Privacy: https://www.hammerstorm.co/privacy

About

K4 Tools

This app assists flight crews with inflight fuel and time calculations, integrating with flight plans. Features include scanning flight data, calculating duty and rest periods, and managing crew breaks. It also helps verify fuel accuracy and pre-flight weather conditions.

Highlights
  • Magic Scanner for FMS data
  • Duty/Rest period calculation
  • Crew break scheduling
  • Fuel receipt verification
  • Pre-flight weather checks
  • iPad optimized interface
Read full description

K4 Tools helps flight crews complete inflight fuel and time checks quickly and accurately — with calculators built around your current flight plan. Highlights: • Magic Scanner: Use the iPhone camera on support models to scan the FMS Position Report and auto-fill required fields. • Duty/Rest Calculator: See Max Duty End, Latest Legal Takeoff, and required rest based on crew size, sequence, and consent — with live remaining duty. • Crew Rest: Share break schedules and keep track visually on the crew break Timeline. • Fuel Checks: Verify pre‑flight fuel upload accuracy across multiple receipts. • Pre-flight weather verification via calculated ETA's at Departure, Destination, Alternate, and ETP Airports. • iPhone + iPad: Optimized for both portrait and landscape use on iPad — including mounted flight-deck configurations.. Limits and warnings appear when operational or contractual thresholds are approached or likely to be exceeded, so you can take corrective action early. Planned updates: - Pro Versioncoming soon! - LogTen Pro integration - tap a button and import all of your flight information with the tap of a button - Crew Rest Alarms automatically set for selected break period. - Custom Crew Rest break lengths

Screenshots

Hammer Construction Calculator3 screens
K4 Tools1 screens

Verdict

The call

The clearest difference is rating: K4 Tools at 5.0 against Hammer Construction Calculator's 3.0. K4 Tools also leads on in-app purchases (none vs 2). Hammer Construction Calculator's advantage is ratings volume (3 vs 1) and iOS requirement (16.0 vs 26.0). On price, update cadence, 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. Hammer Construction Calculator sells 2 in-app purchases, starting at $3.99 per month. K4 Tools asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

K4 Tools holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

UpkeepUpdate frequency

Hammer Construction Calculator ships an update every 6 weeks, K4 Tools monthly. The most recent releases landed on October 7, 2026 and October 22, 2026 respectively.

Scorecard5 real differences · 5 level
Hammer Construction Calculator versus K4 Tools: the parameters behind the verdict, then further details
ParameterHammer Construction CalculatorK4 Tools
PriceFreeFree
Rating3.0 (3 ratings)5.0 (1 ratings) — better
Positive reviews0.0% of reviews—
Number of ratings3 — better1
Update frequencyEvery 6 weeksMonthly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, Mac — betteriPhone, iPad
Requires iOS16.0 — better26.0
Further details — not scored
Size39 MB31 MB
Age rating4+4+
Developergarrett hiebertJames Everett

Customer experience

Hammer Construction Calculator

All ratings3 ratings
Positive33.3%
Neutral33.3%
Negative33.3%
Written reviews2 reviews
Positive0.0%
Neutral50.0%
Negative50.0%

K4 Tools

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

2 purchases

Hammer Construction Calculator

Subscriptions2
  • HammerCalc Monthly7 Days trial$3.991 Month
  • HammerCalc Yearly7 Days trial$24.991 Year
None

K4 Tools

No in-app purchases

Questions

Is Hammer Construction Calculator free?
Hammer Construction Calculator is free to download, with in-app purchases available.
Is K4 Tools free?
K4 Tools is free to download, with no in-app purchases.
Which has better reviews, Hammer Construction Calculator or K4 Tools?
K4 Tools is rated higher. Hammer Construction Calculator averages 3.0 out of 5 from 3 ratings, while K4 Tools averages 5.0 from 1 ratings.
Do Hammer Construction Calculator or K4 Tools have ads?
Neither Hammer Construction Calculator nor K4 Tools shows ads.
Which is updated more often, Hammer Construction Calculator or K4 Tools?
Hammer Construction Calculator ships an update every 6 weeks, and K4 Tools monthly. Most recently, Hammer Construction Calculator was updated on October 7, 2026 and K4 Tools on October 22, 2026.

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