Follow Up Boss vs Sierra Interactive: CRM or Website Platform?

The short answer

Sierra Interactive brings in leads through a website; Follow Up Boss manages leads from anywhere.

Pick Follow Up Boss if you already have a website or buy leads from portals, and want a CRM with no contract.

Pick Sierra Interactive if you want your own lead-generating website with a CRM and dialer at a published price, and are fine with a 12-month agreement.

Follow Up Boss vs Sierra Interactive, side by side

Here are Follow Up Boss and Sierra Interactive on the facts that decide the choice, as of September 22, 2026.

The real difference

The two are closer to partners than rivals.

Sierra builds fast IDX websites, runs Google and Facebook ads for a fee, and includes a CRM and a dialer. Follow Up Boss does not build websites; it takes leads from more than 200 sources and routes them.

Sierra's integrations guide documents a two-way sync of leads, agents, tags and messages with Follow Up Boss.

Price

A team of five running both pays about $1,019 a month.

Sierra's Starter plan is $299.95 a month prepaid for the year, or $359.95 paid monthly plus a $500 setup fee; either way it is a 12-month agreement. Essential is $399.95 for three users with the dialer, and Growth is $599.95 for five.

Follow Up Boss is $69 per user a month, or $499 for ten users on Pro. Running both, a team of five pays about $1,019 a month: $519.95 for Sierra Essential with two extra users, paid yearly, plus $499 for Follow Up Boss Pro.

Paying Sierra monthly makes it about $1,094, plus a $500 setup fee.

What agents complain about

The top complaint about Follow Up Boss is "The phone app is slower than the desktop CRM"; about Sierra Interactive, "Error messages in the app".

Follow Up Boss: "Follow up boss as a browser and system is incredible. The app is atrociously slow." (App Store review, August 2026)

Sierra Interactive: "I have to deal with constant error messages popping up across the bottom and interfering with use." (App Store review, May 2026)

AI

Sierra's AI texting is a $199 add-on; FUB AI is included and drafts for you.

Sierra's Lead Engage texts, qualifies and re-engages leads by itself for $199 a month, on Essential and Growth only. FUB AI drafts replies, suggests tasks and summarizes calls for you to send, at no extra cost.

Using both, or switching

Sierra's phone app outscores Follow Up Boss's: 4.8 against 4.3 on iPhone.

Sierra's iPhone app holds 4.8 from 1,730 ratings against 4.3 from 387 for Follow Up Boss. Sierra has only 3 reviews on G2, too few to compare desktop scores; Follow Up Boss holds 4.6 on G2 from 118.

What neither one does

Whichever you pick, somebody still has to do the work the CRM reminds you about.

FUB AI drafts and suggests inside Follow Up Boss. You still open the app, find the lead and press send, and deal work like the lender's letter or the inspection date is not what the AI is built for.

Sierra captures the lead and Lead Engage can text it. Once the lead becomes a client, the showings, the lender and the dates still run through you.

Sifta works beside either one. It connects to your Gmail or Outlook and your calendar and runs by text.

It drafts replies to portal leads in your voice with real open times and texts them to you to approve, tracks the deal dates it finds in your email, joins the group text with your client to book showings, pulls comps on any address, and briefs you each morning.

It is not a CRM, it does not make phone calls, and it does not replace Follow Up Boss or Sierra Interactive. If your CRM gives you an email-in address, Sifta can copy the lead replies it sends there, so your CRM can log them. Sifta Pro is $199 a month.