Building Start vs Proof TAB
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Building Start
This platform digitizes field testing for construction and engineering projects. It allows for centralized test plan creation and offline execution on field devices, synchronizing data back to the cloud upon completion.
- Centralized test plan authoring
- Push test plans to field devices
- Offline field testing capabilities
- Data synchronization to cloud
- Digital capture of construction projects
- Support for TAB, Building Startup, Commissioning, Energy Audits
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Building Start is a field services platform used in construction and engineering to perform centralized test plan authoring and management and push the test plan from the cloud to field devices to perform on-site field testing digitally. Once a field technician has been assigned a project, they can receive the project on their field device and perform the test plan and responses offline and synchronize them back into the cloud when they complete their work for the day. Building Start is widely used in the construction industry with over 30,000 construction projects digitally captured in such efforts as Test, Adjust & Balance (TAB), Building Startup, Building Commissioning (LEED, Green Building,etc) and Energy Audits.
Proof TAB
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Proof TAB brings HVAC testing, adjusting, balancing, and commissioning work to your iPhone and iPad. Record equipment readings on site and coordinate project data with the Proof desktop companion. FIELD DATA, ORGANIZED Keep test information together by project and equipment. Record readings in structured forms and use checklists and issue logs to document your site work. BUILT FOR HVAC TEAMS Work with air handling units, fans, packaged units, chillers, hydronic systems, VAV equipment, duct traverses, and air distribution tests. FROM SITE TO OFFICE Save your work locally and synchronize through your company's Proof workflow. Continue project review and reporting with the desktop companion. LESS RE-ENTRY Use equipment-specific forms and calculations to keep field records consistent and reduce repeated data entry. Proof TAB is part of the Proof CxTAB platform. Company account access and the desktop companion may be required for your workflow. Visit proofcxtab.com to learn more or request a demonstration.
Screenshots
Verdict
The clearest difference is update cadence: Proof TAB at weekly against Building Start's monthly. 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.
Building Start ships an update monthly, Proof TAB weekly. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.
| Parameter | Building Start | Proof TAB |
|---|---|---|
| Price | Free | Free |
| Rating | 3.4 (8 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 8 — better | — |
| Update frequency | Monthly | Weekly — 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 | 12 MB | 948 MB |
| Age rating | 4+ | 4+ |
| Developer | Building Start | Jawad Jaber |
In-app purchases
Building Start
No in-app purchases
Proof TAB
No in-app purchases








