ダクト計算 Pro-風量・静圧・ダクト径 vs LoadSizer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ダクト計算 Pro-風量・静圧・ダクト径
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現場でも設計でも、ダクトの計算をこれ一つで。ダクト計算 Pro は空調・換気設計で毎日使う計算を、完全オフラインでスマホに収めました。 ■ 無料でそのまま使える ・ダクトサイズ選定(等摩擦法・円形)— 風量と単位摩擦損失から必要径を算出し、スパイラルダクトの推奨サイズまで表示 ・単位変換 — 風量・風速・断面積を相互換算。m³/min・m³/h・L/s をワンタップ切替 ■ Pro でさらに ・角ダクト変換 — 相当直径から長辺×短辺(50mm丸め)を算出、アスペクト比の警告付き ・風量逆算 — ダクト径+風速、またはダクト径+摩擦損失から風量を逆算 ・制気口選定 — 風量とネック風速からネックサイズ・有効面積・到達距離の目安を算出 ・静圧計算 — 直管損失+継手(エルボ・分岐・拡大縮小)の局部損失を合計 ■ 実務に合わせた設計 ・風量単位は m³/min・m³/h・L/s、寸法は mm — 日本の設計慣行そのまま ・計算根拠を各画面で表示 — 何をどう出したかが分かる ・結果はコピーして手元のメモや図面に貼り付け可能 ■ 現場でも設計でも ・完全オフライン — 電波の届かない機械室や新築現場でも動作 ・大きめの操作系、画面は消えない(wakelock)、アカウント不要 ・入力値は端末の外に出ません ■ 買い切り 無料版はダクトサイズ選定と単位変換をフル機能で収録(機能制限なし)。ダクト計算 Pro は一度の買い切りで、角ダクト変換・風量逆算・制気口選定・静圧計算を解除します。 サブスクなし。広告なし。機能の後出し削除もなし。 参考計算です。実施設計は関連基準(空気調和・衛生工学便覧、ASHRAE Fundamentals 等)と各製品カタログで必ず検証してください。
LoadSizer
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Size the AC right — get a room-by-room cooling and heating load estimate in under a minute, built on the ASHRAE CLTD/SCL method instead of a single "BTU per square foot" guess. Built for installers doing a quick home survey, engineers who want a fast sanity check before a full Manual J, and homeowners who want more than a rule of thumb before buying an AC. TWO MODES - Quick: floor area, ceiling height, room type, main sun-facing side, insulation level, occupants, top floor or not. Instant estimate. - Detailed: full room construction — exterior walls and windows by orientation (area, U-value, SHGC, shading), roof, ground-floor slab, occupants and activity, lighting, equipment, and outdoor air (ACH). WHAT YOU GET - Sensible, latent and total cooling load (W, Btu/h, kW, ton) plus SHR, and a heating load for the coldest design day. - A horizontal breakdown by component: walls, windows (conduction and solar shown separately), roof, people, lighting, equipment, outdoor air. - A recommended commercial AC size (5,000-60,000 Btu/h) in Btu/h, ton and HP, rounded up to a size you can actually buy — plus a warning if it's oversized or the load per square foot looks off. REAL CLIMATE DATA 35 cities across the Americas, Europe, the Middle East and Asia-Pacific, with outdoor design conditions sourced from ASHRAE Climatic Design Conditions — not one flat number for an entire country. Enter your own design climate for anywhere else. WORKS THE WAY YOU DO - Fully offline. No account, no tracking, no ads. - °C/°F, m²/ft², m/ft, and W/Btu-h/kW/ton/HP, each set independently. - Multiple rooms per project, multiple projects, PDF export. - English, Spanish, Chinese, Portuguese, Japanese, Korean, Vietnamese and Thai. Free for unlimited Quick estimates and one Detailed room. LoadSizer Pro (one-time purchase, no subscription) unlocks unlimited rooms/projects and PDF export. LoadSizer uses a simplified ASHRAE Fundamentals 1997 CLTD/SCL/CLF method for fast sizing guidance — not a substitute for a full Manual J or ASHRAE RTS load calculation, and not certified or endorsed by ASHRAE or ACCA.
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Verdict
ダクト計算 Pro-風量・静圧・ダクト径 and LoadSizer are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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. ダクト計算 Pro-風量・静圧・ダクト径 sells 1 one-off in-app purchase and LoadSizer sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
| Parameter | ダクト計算 Pro-風量・静圧・ダクト径 | LoadSizer |
|---|---|---|
| Price | Free | Free |
| Update frequency | Weekly | — |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 28 MB | 32 MB |
| Age rating | 4+ | 4+ |
| Developer | Gun woo Kim | Duong Nguyen Huu |
In-app purchases
ダクト計算 Pro-風量・静圧・ダクト径
- ダクト計算 Pro$9.99
LoadSizer
- LoadSizer Pro$2.99





