UTCal vs Room Layout Sketch
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
UTCal
This app provides essential ultrasonic testing calculations and reference data for field technicians. It offers tools for skip distance, weld acceptance, beam path diagrams, and code criteria, all accessible offline. Designed for NDT professionals, it eliminates the need for internet connectivity or subscriptions.
- Skip distance calculations
- Beam path diagrams
- Weld overlay
- Pipe data lookup
- Code acceptance criteria
- Job setup saving
- Offline functionality
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Your UT Bible, built for the field. Skip distance, D1.1 acceptance, beam path diagrams, encoder calibration, pipe data, and code criteria — offline, right in your pocket. Built by a working UT and PAUT tech for NDT techs in the field. No account. No internet. No subscription. Runs entirely on-device. CALCULATOR • Skip distance, half skip, and full skip for any angle and thickness • Beam spread — near-field distance, half-angle, and full spread • AWS D1.1 indication rating • Fracture mechanics — critical flaw size & ASME VIII Div 2/3 evaluation • Transfer correction (dB) • Encoder step resolution converter — steps/mm ↔ steps/in, with target-distance conversion for OmniScan PAUT and TOFD scanner calibration • Imperial and metric — switch units anytime BEAM PATH DIAGRAM • Interactive cross-section of your beam path through the material • Drag the probe to see coverage and position change in real time • Rotate to landscape for a fullscreen diagram WELD OVERLAY • Overlay Single V or Double V weld joint profiles on the beam path diagram • 5 standard weld presets, or enter custom bevel angle, root opening, and root face • Index offset — see where your probe index point sits relative to the weld centerline PIPE DATA • NPS 1/8" through 48" per ASME B36.10M • OD, ID, wall thickness, and scan length for every standard schedule • Stainless steel schedules where wall thickness differs from carbon steel (dual ASME standard support) • Apple Watch companion — quick pipe lookups on your wrist CODE ACCEPT/REJECT CRITERIA • ASME Section V, Article 4 • ASME B31.3 — Process Piping • AWS D1.1 — Structural Welding • API 1104 — Pipeline Welding • Inches and millimeters, side by side SETUPS & HISTORY • Build and save complete job setups — material, angle, frequency, weld geometry, and notes • Save calculation results with names and notes, then recall them in one tap for your records • Custom presets for your most-used configurations FREE & PRO • Free to download — skip distance, Snell's law, and a hands-on trial of every Pro tool • The full pipe chart is free for your first 10 lookups, then part of Pro • UTCal Pro unlocks unlimited use of everything: the full pipe chart, saved calculation history, custom presets & weld builder, encoder calculator, fracture mechanics, beam path diagrams, weld overlay, the full code library, and the Apple Watch app • One-time purchase — no subscription, ever WHY UTCAL • Built by a UT tech who got tired of doing skip math on a paper napkin • Works on the roof, in the ditch, in the shop — no signal required • Updated for the latest ASME, AWS, and API editions Questions or feature requests: support.utcal@carboncode.app
Room Layout Sketch
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Room Layout Sketch is a simple room layout sketching tool for furniture planning. Key features: - Create room sketches with dimensions, wall segments, doors, and windows. - Place and adjust furniture footprints using templates or custom sizes. - Run layout checks for overlaps, blocked doors, narrow walkways, and window-area issues. - Save plan snapshots and export layout images when you want a reference copy. No account required.
Screenshots
Verdict
The clearest difference is in-app purchases: Room Layout Sketch at none against UTCal's 1. Room Layout Sketch also leads on iOS requirement (15.6 vs 17.6). 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
Both are free to download. UTCal sells 1 one-off in-app purchase. Room Layout Sketch asks for nothing beyond the download.
Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.
| Parameter | UTCal | Room Layout Sketch |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Fortnightly | Fortnightly |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | — |
| Devices | iPhone, Apple Watch | iPhone, iPod |
| Requires iOS | 17.6 | 15.6 — better |
| Further details — not scored | ||
| Size | 10 MB | 44 MB |
| Age rating | 4+ | 4+ |
| Developer | Tomas Ramirez | Venus Windsor |
In-app purchases
UTCal
- UTCal Pro$14.99
Room Layout Sketch
No in-app purchases









