Building Stack vs. Flex Comparison


Building Stack	Flex Flexible Finance Inc.	+	+
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		Related Products Buildium Buildium is all-in-one property management software trusted by thousands of property managers to take control of their business and drive more revenue per door. It’s the #1 most recommended for a reason. From accounting and communications to leasing, top-rated mobile apps and more—there’s everything you need to thrive. You’ll be able to find new revenue streams from resident services, count on award-winning support, and tap into an ecosystem of proven integrations with Buildium Marketplace. No matter the portfolio, Buildium is purpose-built for your job. With packages starting at just $62 a month, and zero hidden fees, it’s no wonder Buildium is ranked by Forbes to be the “Best Real Estate Accounting Software for Property Managers.” 2,562 Ratings Visit Website TurboTenant TurboTenant is an all-in-one property management software built for independent landlords. 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A simple way to streamline your maintenance and operations for both property managers and tenants. 527 Ratings Visit Website Portfolio Manager Blue Sky's "Portfolio Manager" Lease Management Software is an easy to learn and use cloud-based solution for centralized tracking and reporting of lease contracts. By managing your lease contracts and associated maintenance contracts throughout the entire lifecycle you can strengthen the audit process, reduce costs, increase cash flows and mitigate risk with centralized visibility that drives enterprise value. Portfolio Manager provides complete status management for running leasing RFP's, tracking status, notes, documents and next steps for every open project. Bulk data imports allow for efficient data entry. Fully customizable with robust reporting capabilities. The custom report writer allows every data field to be exported to excel. Pre-built templates are available to feed most ASC842 lease accounting software templates. 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With StackAI you can: • Connect knowledge bases (SharePoint, Confluence, Notion, Google Drive, databases) with versioning, citations, and access controls • Publish AI agents as chat assistants, advanced forms, or APIs integrated into Slack, Teams, Salesforce, HubSpot, or ServiceNow • Govern usage with enterprise security: SSO (Okta, Azure AD, Google), RBAC, audit logs, PII masking, data residency, and cost controls • Route across OpenAI, Anthropic, Google, or local LLMs with guardrails, evaluations, and testing • Deploy in multi-tenant cloud, dedicated cloud, private cloud, or on-premise 55 Ratings Visit Website STACK Bid Faster, Win More, and Build Smarter with STACK Takeoff & Estimate and STACK Build & Operate. From office to field, STACK speeds up your processes so you can stay competitive and eliminate uncertainty. Save time with STACK's powerful, time-saving AI features. Accelerated by AI. Driven by You. Features: - Fast, Accurate Takeoffs Powered by AI and Your Expertise - Regional Cost Data & Detailed Estimates - Streamlined Workflows & Document Control Create a free account or schedule a demo today! 1,496 Ratings Visit Website PayHOA PayHOA is modern software for self-managed communities. Trusted by more than 11,000 associations, PayHOA automates operations, so you can focus on what's important. We provide free onboarding, free unlimited support, a 30-day free trial, and no contracts. Claim your free trial and see why HOAs across the country are choosing PayHOA. Features include invoicing, payment processing, full accounting, document management, violations, requests, text, email, direct mail, lockbox, CRM, website, and more. 817 Ratings Visit Website
About Building Stack is a cloud-based property management solution designed for Canadian businesses of all sizes. Key features include lease management, employee management, building maintenance, automated listing syndication, tenant communication and reporting, expense and time tracking, digital lease and document signature and online rent payment collection. With Building Stack, users can organize current vacancies and upcoming lease renewals, track the progress of repairs in their units, document tenant requests, receive online rent payments and more. Tenants have the ability to view make online payments, communicate with their landlord and view building information. Building Stack automatically posts vacancies onto multiple websites such as Kijiji and Facebook Marketplace. Users can manage leads who respond to the automated postings through Building Stack, and perform credit checks. A custom company or building website can also be created and tailored to the user’s needs.	About Flex is a financial technology platform that lets renters pay their monthly rent on a flexible schedule by splitting the total amount into two smaller, more manageable payments while still ensuring the landlord or property manager receives the full rent on time. When a rent charge is posted, users make a first payment and Flex provides access to a credit line to cover the remainder, which it pays directly to the property or via a provided account; later in the month the renter repays the credit line according to their chosen schedule. The Flex app lets users monitor payment status in real time, manage and reschedule payments, and receive push notifications to stay on track. Flexible rent reporting can also help build a positive credit history by reporting on-time payments to credit bureaus. Flex integrates with major property management systems such as AppFolio, RentCafe, Yardi Voyager, and others to embed flexible payment options directly into resident portals.
Platforms Supported Windows Not Supported Mac Not Supported Linux Not Supported Cloud Supported On-Premises Not Supported iPhone Supported iPad Supported Android Supported Chromebook Not Supported	Platforms Supported Windows Not Supported Mac Not Supported Linux Not Supported Cloud Not Supported On-Premises Not Supported iPhone Supported iPad Not Supported Android Supported Chromebook Not Supported
Audience Canadian property management businesses	Audience Renters and property managers who want to make monthly rent payments more manageable by splitting rent into flexible installments while ensuring full on-time payment
Support Phone Support Supported 24/7 Live Support Not Supported Online Supported	Support Phone Support Not Supported 24/7 Live Support Supported Online Supported
API Offers API Supported	API Offers API Not Supported
Screenshots and Videos View more images or videos	Screenshots and Videos View more images or videos
Pricing $0 Pricing is based on tier size of the portfolio and which module selected. Free online rent payment plan option is available for anyone managing > 10 units. Monthly subscription - minimum 1 year agreement. Free Version Supported Free Trial Not Supported	Pricing $14.99 per month Free Version Not Supported Free Trial Not Supported
Reviews/Ratings Overall 1.0 / 5 ease 1.0 / 5 features 1.0 / 5 design 1.0 / 5 support 1.0 / 5 Read all reviews	Reviews/Ratings Overall 0.0 / 5 ease 0.0 / 5 features 0.0 / 5 design 0.0 / 5 support 0.0 / 5 This software hasn't been reviewed yet. Be the first to provide a review: Review this Software
Pros & Cons from Real Users Pros Nothing, no pros Cons Registration process is a disaster. Provided all my info, and got a message stating someone will get back, no, no one is getting back, registration fails. Calling them is not working at all, no one answers the phone, no callbacks, no nothing.
Training Documentation Supported Webinars Not Supported Live Online Not Supported In Person Supported	Training Documentation Supported Webinars Not Supported Live Online Not Supported In Person Not Supported
Company Information Building Stack Founded: 2009 Canada buildingstack.com	Company Information Flexible Finance Inc. Founded: 2025 USA getflex.com
Alternatives Rentec Direct	Alternatives RentTrack
Schedule My Rent	Rentistry Foxen
AppFolio Property Manager AppFolio	PayYourRent.com PayYourRent
Property Matrix	ClearNow
PayYourRent.com PayYourRent View All	RentPayment MRI Software View All
Categories Apartment Management Supported Lease Management Supported Real Estate Property Management Supported Rent Payment Supported Rental Property Management Supported	Categories Rent Payment Supported
Show More Features Lease Management Features Billing & Invoicing Supported Commercial Leases Not Supported Contact Management Supported Landlord Database Supported Lease Classification Not Supported Portfolio Management Supported Property Management Supported Residential Leases Supported Retail Leases Not Supported Sublease Management Not Supported Tenant Database Supported Real Estate Property Management Features Billing & Invoicing Supported Commercial Properties Supported Contact Management Supported Credit Check Supported Expense Management Supported Insurance Management Supported Landlord Database Supported Late Fee Calculation Not Supported Lease Management Supported Maintenance Management Supported Owner Portal Supported Payment Processing Supported Portfolio Management Supported Rent Tracking Supported Residential Properties Supported Tax Management Supported Tenant Database Supported Tenant Portal Supported Vacancy Tracking Supported Website Management Supported Rental Property Management Features Credit Check Supported Expense Management Supported Online Payments Supported Owner Portal Supported Tax Management Supported Tenant Management Supported Tenant Portal Supported Tenant Screening Supported Vacancy Tracking Supported Website Management Supported
Integrations Yardi Voyager Supported AppFolio Property Manager Not Supported Chatlease Supported Mastercard SpendingPulse Not Supported Primmo Supported RentCafe Not Supported TransUnion Collections Management Not Supported Zapier Supported View All 4 Integrations	Integrations Yardi Voyager Supported AppFolio Property Manager Supported Chatlease Not Supported Mastercard SpendingPulse Supported Primmo Not Supported RentCafe Supported TransUnion Collections Management Supported Zapier Not Supported View All 5 Integrations
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