HVAC Tools PT Chart vs AppAirTools
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HVAC Tools PT Chart
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Gauge is a field toolkit for HVAC and refrigeration technicians: a pressure-temperature chart for 10 refrigerants, superheat and subcooling calculators, troubleshooting checklists and a service call log with PDF reports. PT CHART - R-410A and R-22 free; R-134a, R-407C, R-404A, R-32, R-454B, R-290, R-438A and R-422D with Pro - Look up the saturation temperature for a pressure, or the pressure for a temperature - Scroll the full table from -40°F, with safety notes for the A2L (R-32, R-454B) and A3 (R-290) refrigerants CALCULATORS - Superheat: suction pressure and suction line temperature give the saturation temperature and the superheat - Subcooling: liquid line pressure and liquid line temperature - Temperature split: return and supply air - Ohm's Law: enter any two of volts, amps, ohms and watts - Pro: airflow (required CFM from BTU/h or tons and the temperature split), duct sizing (round and rectangular sizes from CFM and air velocity), capacitor check (measured against rated µF) and voltage drop (copper wire by AWG, one-way length, amps and supply voltage) Superheat, subcooling, temperature split, capacitor and voltage drop results are color-coded against typical ranges, with what to check next. SERVICE CALL LOG - Customer or address, complaint, system type, make and model - Suction and liquid pressure, superheat, subcooling, suction line, liquid line, supply and return air temperatures, compressor amps - Your diagnosis, the work performed, refrigerant type and amount, parts, notes, cost and time on the job - Free: up to 10 service calls. Pro: unlimited calls, search, and a PDF service report with your name and certification that you can share with the customer REFERENCE - Step-by-step checklists: AC not cooling (free), furnace not heating and heat pump not heating (Pro) - Typical ranges for superheat, subcooling, temperature split and compressor amps - Refrigerant facts: GWP, A2L or A3 safety class and phase-down status - System types, a copper wire ampacity table and an EPA 608 overview (certification types and key rules) AI ADVISOR (PRO) Describe a symptom or a set of readings and get a short written answer from an AI model. It sends only the message you type and needs an internet connection. AI answers can be wrong: check them against your own readings and the equipment manufacturer's data. GOOD TO KNOW - Gauge works in US units: °F, psig, CFM, inches, feet, AWG and pounds - The PT chart, calculators, reference and service log work without a connection GAUGE PRO Free: the PT chart for R-410A and R-22, the superheat, subcooling, temperature split and Ohm's Law calculators, up to 10 service calls, the AC checklist and the reference tables. Pro adds the other 8 refrigerants, the airflow, duct sizing, capacitor and voltage drop calculators, unlimited service calls with search and PDF reports, the furnace and heat pump checklists and the AI Advisor. In the US, Gauge Pro is $4.99 a month or $39.99 a year (US prices; other countries see their own price in the app). Subscriptions renew automatically unless cancelled at least 24 hours before the end of the period. Manage them in your App Store account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
AppAirTools
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AppAirTools คือเครื่องมือวิเคราะห์สำหรับช่างแอร์มืออาชีพ เชื่อมต่อกับบอร์ดฮาร์ดแวร์ผ่านบลูทูธ (BLE) เพื่ออ่านสัญญาณบัสสื่อสารภายในเครื่องปรับอากาศ แล้วถอดค่าออกมาให้เห็นแบบเรียลไทม์ อ่านค่าจริงจากคอยล์เย็น คอยล์ร้อน - อุณหภูมิห้อง คอยล์ ท่อดิสชาร์จ หัวคอม - โหมดทำงาน Cool Dry Fan Auto และอุณหภูมิที่ตั้ง - ระดับพัดลม สถานะคอมเพรสเซอร์ ความถี่ และรอบพัดลม - รหัสฟอลต์ Error code พร้อมคำอธิบาย รองรับหลายยี่ห้อ TCL Panasonic Daikin Mitsubishi Sharp LG Carrier Hisense และรุ่น OEM ที่ผลิตร่วมกัน ออกแบบมาเพื่อหน้างานจริง - สลับภาษา ไทย/อังกฤษ ได้ทั้งแอป - ปุ่มรีเช็คในตัว เชื่อมต่อใหม่ได้เร็ว - แจ้งเตือนเมื่อบลูทูธหลุด หรือบัสเงียบ - ค่าที่อ่านได้แสดงค้างไว้ อ่านง่าย พร้อมหน่วยกำกับทุกค่า หมายเหตุ: การอ่านค่าแอร์แบบสดต้องใช้ร่วมกับบอร์ดฮาร์ดแวร์ AppAirTools ที่ต่อเข้ากับเครื่องปรับอากาศ ข้อกำหนดการใช้งาน (Terms of Use / EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ นโยบายความเป็นส่วนตัว (Privacy Policy): https://appair-3c64f.web.app/
Screenshots
Verdict
The clearest difference is update cadence: AppAirTools at every 3 days against HVAC Tools PT Chart's monthly. AppAirTools also leads on device support (3 vs 1) and iOS requirement (15.0 vs 18). On price, ads and in-app purchases 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. HVAC Tools PT Chart sells 3 in-app purchases, starting at $4.99 per month and AppAirTools sells 1 in-app purchase, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.
HVAC Tools PT Chart ships an update monthly, AppAirTools every 3 days. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.
| Parameter | HVAC Tools PT Chart | AppAirTools |
|---|---|---|
| Price | Free | Free |
| Update frequency | Monthly | Every 3 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 18 | 15.0 — better |
| Further details — not scored | ||
| Size | 9 MB | 136 MB |
| Age rating | 4+ | 4+ |
| Developer | Karol Jaworski | wanchai khwunkhum |
In-app purchases
HVAC Tools PT Chart
- Gauge Pro$4.991 Month
- Gauge Pro1 Year trial$39.991 Year
- Gauge Pro$39.991 Year
AppAirTools
- สมาชิกรายเดือน$0.991 Month
Questions
Is HVAC Tools PT Chart free?
Is AppAirTools free?
Do HVAC Tools PT Chart or AppAirTools have ads?
Which is updated more often, HVAC Tools PT Chart or AppAirTools?
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