Follow Up Boss vs Lofty vs Sierra Interactive: Which AI Integrates Best

TL;DR

• Follow Up Boss — the most open of the three. Best for teams that want to keep their CRM and add best-in-class AI on top (showing replies, multi-offer analysis, compliance tracking).
• Lofty (formerly Chime) — closed, all-in-one, IDX + CRM + AI in one bundle. Best for teams starting fresh with no CRM investment to protect and a preference for one vendor.
• Sierra Interactive — the most sophisticated built-in AI of the three, and also the least flexible. Best for teams that want vertical integration and are willing to pay for it.
• ShowSmartly — complements Follow Up Boss; alternative-adjacent to Lofty and Sierra. If FUB is your CRM, ShowSmartly adds the listing-side AI that FUB itself doesn't cover. If Lofty or Sierra is your CRM, ShowSmartly is more of an evaluation-time alternative than an add-on.

Core CRM strengths

Follow Up Boss

FUB is a focused CRM. It does contacts, deals, pipelines, action plans, smart lists, and communication — that's it. No IDX, no website, no lead capture beyond the standard integrations. The tradeoff is that it's exceptionally good at the things it does, has a clean API (Pro and Premier plans), and integrates with basically every real estate tool worth using. Ownership by Zillow has not, so far, closed that door.

Lofty (formerly Chime)

Lofty CRM dashboard showing leads with re-suscite scores, pipeline stages, agent assignments, and the built-in Lofty AI assistant side panel — Lofty — leads dashboard with the built-in Lofty AI assistant side panel. Source: lofty.com.

Lofty bundles CRM, IDX website, lead capture, dialer, transaction management, and AI assistant into one platform. The pitch is one vendor, one login, one bill. The reality is that some pieces are best-in-class and some are just there — the IDX and dialer are strong, the transaction management is thin. Historically the AI is competitive on the buyer-lead nurture side and weak on the listing side.

Sierra Interactive

Sierra is the premium option — IDX website, CRM, AI lead scoring, and marketing automation built as one stack. The AI/analytics layer is genuinely the deepest of the three (behavior-based lead prioritization, predictive close-probability, integrated marketing attribution). It's also the most expensive and the least flexible about integrating outside tools.

AI integration depth: what each platform actually gives you

Capability	Follow Up Boss	Lofty	Sierra Interactive
Built-in AI focus	Buyer-lead nurture + reply drafting	Buyer-lead nurture, dialer coaching	Predictive lead scoring, marketing attribution
Third-party AI via API	Yes — clean, documented API	Limited — some webhooks, partial data access	Very limited — mostly closed
Listing-side AI	None built-in — layer ShowSmartly	Weak	Weak
NAR-compliant showing replies	Requires add-on (ShowSmartly)	Manual templates	Manual templates
Multi-offer analysis	Requires add-on	No	No
Two-way deal sync with outside AI tools	Yes	Partial	No
Ability to keep AI vendor when you switch CRMs	Yes — AI travels with your data	No — Lofty is the AI	No — Sierra is the AI

The pricing and capability positioning above stays in sync with the comparison table on our Follow Up Boss AI lander — we treat that as the source of truth.

Switching costs

This is where the theoretical "which is best" answer collides with the practical "what would it cost me to move." Rough estimates for a 10-agent team:

• Follow Up Boss → any other CRM. Migration cost: moderate. FUB exports cleanly (contacts, deals, notes, custom fields) and every other CRM imports those formats. Rebuild time for smart lists and action plans in the new tool: 2–3 weeks. Historical email/text threads are the sticky part — those don't move.
• Lofty → anything else. Migration cost: high. IDX website has to be rebuilt (potentially SEO-costly), dialer configuration and campaign history are lost, and the transaction management data is thin to begin with. Contacts and deals move; the surrounding ecosystem doesn't.
• Sierra → anything else. Migration cost: highest. Sierra's data model is the most integrated with its AI and marketing layer — moving contacts loses the behavioral scoring history, and the IDX site is deeply Sierra-shaped. Teams that switch off Sierra typically absorb a 6–12 month productivity dip.

This matters when you think about the AI layer: with FUB, the AI vendor and the CRM vendor are separate decisions. With Lofty or Sierra, they're the same decision, and unwinding one means unwinding both.

Pricing (2026, publicly listed)

• Follow Up Boss. $69–$99/agent/month for Pro, $150+/agent/month for Premier (team features). Add-on AI vendors (like ShowSmartly at $10/agent/month) are separate line items — total ~$79–$160/agent depending on plan and add-ons.
• Lofty. Team plans start around $500+/month at the low end, scaling with agent count and add-ons. IDX, dialer, and AI are usually bundled but priced by team size rather than by seat.
• Sierra Interactive. Team plans start around $500+/month plus setup fees. Enterprise-tier features (predictive AI, custom marketing automation) run substantially higher.

Recommendation framework by team size

Solo agent or 2–3 person team

Follow Up Boss Pro + ShowSmartly. The bundled platforms are overkill and the cost per seat is disproportionate at low agent counts. FUB gives you the CRM you'll grow into; add the AI layer you need without paying for IDX and dialer you don't.

4–12 person team

Follow Up Boss Premier + ShowSmartly for teams heavy on listings and compliance. Lofty for teams heavy on IDX-driven buyer lead generation who want one vendor. Sierra rarely wins here unless the team is already Sierra-native.

15+ person team or brokerage

All three are viable. Follow Up Boss + ShowSmartly stays the most flexible and gives you room to swap components as you grow. Lofty is the pragmatic all-in-one for larger teams that don't want to be integrators. Sierra is the right pick when the marketing-attribution AI is a durable competitive advantage — usually a brokerage that leans heavily on paid buyer-lead generation.

Where ShowSmartly sits in each ecosystem

We're an AI layer, not a CRM. That shapes where we fit:

• With Follow Up Boss: complementary. Two-way sync via FUB's API, embedded widget, deal-level write-back for showing replies and disclosures. See Follow Up Boss AI for the full integration surface.
• With Lofty: mostly alternative. Lofty's AI covers what our showing-reply and lead-nurture layer does, and the closed data model makes deep two-way sync hard. Teams that want ShowSmartly's listing-side workflows typically consider it as a Lofty replacement rather than an add-on.
• With Sierra Interactive: mostly alternative. Sierra's built-in predictive AI covers different ground than ours, and the closed platform makes deep integration impractical. If listing-side compliance and multi-offer analysis are the missing pieces, we're a replacement candidate for the CRM/AI stack, not an add-on to it.

For per-seat pricing across our own plans, see pricing. For the deeper FUB integration story, the Follow Up Boss AI lander is the best next read.

The verdict

"Which AI integrates best" isn't really a Follow Up Boss vs Lofty vs Sierra question — it's an open-vs-closed question. Follow Up Boss chose open, and that's why the strongest AI additions (multi-offer ranking, compliance-versioned showing replies, deal-level disclosure logging) show up as FUB add-ons before they show up in Lofty or Sierra. If your top priority is best-in-class AI on top of your CRM without being locked to one vendor's roadmap, Follow Up Boss + a specialist AI layer wins. If your priority is one throat to choke and you're happy with the AI you're issued, Lofty or Sierra is the shortcut.