SMART Union vs Proof TAB
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SMART Union
Stay informed with union news and important notifications. Access member benefits, local union information, and resources to manage your meeting experience with schedules and maps.
- Union news updates
- Important notifications
- Member benefits access
- Local union information
- Meeting schedules and maps
- Member resources
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The new SMART Union app gets information to members faster and easier than ever before! STAY INFORMED Keep up to date with SMART news, and receive important notifications and updates. GET ANSWERS FAST Access member benefits, Local Union information, and member resources MANAGE YOUR VISIT Maximize your meeting experience with session schedules, maps, and more.
Proof TAB
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Proof helps field technicians and engineers perform Testing, Adjusting and Balancing (TAB) and Commissioning (Cx) work more efficiently, accurately, and professionally on site. Built to work seamlessly with its desktop companion, the app enables iPhone users to capture data in the field and sync it automatically to the desktop for streamlined review, reporting, and project coordination. Designed around real site needs and aligned with international standards, Proof supports a wide range of workflows, including: Packaged Units Air Handling Units (AHUs) Fresh Air AHUs Chillers and hydronic water systems Customizable forms Checklists Issue logs Site observations With Proof, teams can reduce paperwork, improve consistency, and deliver clearer, faster, and more reliable TAB and Cx documentation from site to office. A slightly more breakthrough marketing version: Proof transforms how TAB and Commissioning teams work on site. It gives technicians and engineers a faster, smarter way to collect, manage, and synchronize field data while working in full coordination with the desktop platform. Data captured on iPhone is automatically synced, helping teams move seamlessly from field execution to office review and final reporting. Developed to meet real project-site demands and support internationally recognized workflows, Proof covers key equipment and processes such as Packaged Units, AHUs, Fresh Air AHUs, chillers, water systems, custom forms, checklists, issue tracking, and site observations. From field data capture to final documentation, Proof helps deliver better accuracy, stronger consistency, and a more professional TAB and Cx process.
Screenshots
Verdict
The clearest difference is update cadence: Proof TAB at every 8 days against SMART Union's every 2 months. On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
SMART Union ships an update every 2 months, Proof TAB every 8 days. The most recent releases landed on August 28, 2026 and September 5, 2026 respectively.
| Parameter | SMART Union | Proof TAB |
|---|---|---|
| Price | Free | Free |
| Rating | 3.3 (28 ratings) — better | — |
| Positive reviews | 28.6% of reviews | — |
| Number of ratings | 28 — better | — |
| Update frequency | Every 2 months | Every 8 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 165 MB | 935 MB |
| Age rating | 4+ | 4+ |
| Developer | International Association of Sheet Metal, Air, Rail and Transportation Workers | Jawad Jaber |
In-app purchases
SMART Union
No in-app purchases
Proof TAB
No in-app purchases
Questions
Is SMART Union free?
Is Proof TAB free?
Do SMART Union or Proof TAB have ads?
Which is updated more often, SMART Union or Proof TAB?
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