Comparison

Building Start vs Proof TAB

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

Proof TAB

Features
Read full description

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

Building Start4 screens
Proof TAB4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Building Start ships an update monthly, Proof TAB weekly. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard1 real difference · 9 level
Building Start versus Proof TAB: the parameters behind the verdict, then further details
ParameterBuilding StartProof TAB
PriceFreeFree
Rating3.4 (8 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings8 — better—
Update frequencyMonthlyWeekly — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size12 MB948 MB
Age rating4+4+
DeveloperBuilding StartJawad Jaber

In-app purchases

None

Building Start

No in-app purchases

None

Proof TAB

No in-app purchases

Questions

Is Building Start free?
Building Start is free to download, with no in-app purchases.
Is Proof TAB free?
Proof TAB is free to download, with no in-app purchases.
Do Building Start or Proof TAB have ads?
Neither Building Start nor Proof TAB shows ads.
Which is updated more often, Building Start or Proof TAB?
Building Start ships an update monthly, and Proof TAB weekly. Most recently, Building Start was updated on November 1, 2026 and Proof TAB on November 3, 2026.

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