Substrait runs inside the CRM your team already logs into. Fello is a platform your database moves onto, and Felix is sold on top of it.
If Sierra Interactive or Follow Up Boss is already working for you, Substrait costs less and nothing moves. If you want the database product itself, Fello is a real one.
Nine differences that decide it.
| Substrait | Fello (Felix) | |
|---|---|---|
| Where the AI runs | Inside the CRM you already use | Fello’s own platform |
| Moving your database | Nothing moves | Your contacts live on Fello |
| Is the AI in the base price | Yes. It is the product | No. Felix is an add-on on every plan |
| What it does | Text and email | AI calling, SMS and email |
| Who the lead hears from | Your agent, by name | Felix, a named AI |
| Price at 5,000 contacts | $179 a month, AI included | $599 a month, before Felix |
| Price at 15,000 contacts | $329 a month, AI included | $1,049 a month, before Felix |
| What the AI costs | Nothing extra | Not published |
| Past clients and your sphere | Encore™. Anniversaries, birthdays, your own market page | A home value estimate under Fello’s brand |
Substrait prices are the founding-member rate, which is 40 percent off the list price of $299 and $549 and holds for as long as you stay. Fello figures are the published monthly rates on their pricing page, checked 29 August 2026, and are the base plan only. Annual billing is lower on both sides.
What each one actually is.
Fello is a database platform for real estate teams. You put your contacts on it, and their Living Database enriches those records with property, mortgage and contact signals. Felix is the AI layer, and their pricing page sells it as an add-on you attach to a plan rather than as part of one. Felix does the calling, texting and emailing, and the lead meets Felix by name.
Substrait is an AI ISA that runs inside your existing CRM account. It reads the lead record your agents already look at, decides the next move, and sends from your office’s own number, in your agent’s name. There is no second platform and no second copy of your database. It works Sierra Interactive and Follow Up Boss today.
What each one costs at your database size.
Substrait bills one flat rate by database size, and the AI is the product. Fello bills for the platform, and Felix is extra.
| Active contacts | Substrait, AI included | Fello base, before Felix | Difference a year |
|---|---|---|---|
| 3,000 contacts | $179 a month | $499 a month, Growth plan | $3,840 |
| 5,000 contacts | $179 a month | $599 a month, Growth plan | $5,040 |
| 10,000 contacts | $329 a month | $799 a month, Scale plan | $5,640 |
| 15,000 contacts | $329 a month | $1,049 a month, Scale plan | $8,640 |
| 25,000 contacts | $539 a month | $1,549 a month, Scale plan | $12,120 |
| 40,000 contacts | $539 a month | $2,000 a month, Enterprise plan | $17,532 |
Fello figures use whichever published plan is cheapest at that size, including the $50 per additional 1,000 contacts. The Fello column is the platform on its own. Felix is an add-on on every plan and its price is not published, so the real gap is wider than the last column shows. Rates checked 29 August 2026 on Fello’s pricing page.
Three questions worth answering first.
The table covers the specifications. These are the three that are actually arguments, and reasonable people land differently on them.
Felix calls your leads. The voice is built to pass for a person, down to the pauses. That works, and some teams want it.
We took the other side. Substrait writes and does not perform, and the phone call belongs to your agent. There is no warm transfer and no moment where the lead works out what they were talking to.
With Felix, the lead meets a named AI first, and every Fello customer’s leads meet the same one.
Substrait sends as your agent, tuned to how that agent writes. Your leads never learn a second name, and the thread they see is one continuous conversation.
Fello wants to be your database. That is a real product decision, not a flaw, and it is the whole basis of the Living Database.
Substrait assumes you already picked a CRM and your agents live in it. It works those records rather than a copy, so there is no second system for your team to check and nothing to migrate on the way in or out.
When Fello is the better buy.
When you have not committed to a CRM. If your database is spread across spreadsheets and an old system nobody logs into, buying a platform and an AI together is a reasonable way to start. Substrait needs a CRM to run inside. Fello does not.
When the enrichment is the point. Their Living Database is genuinely good. Property, mortgage and contact signals on records you already own is a real product, and they were early to the idea that the opportunity is already in your database.
When you want the AI on the phone. We think that call belongs to your agent. If you disagree, that is a preference and not a mistake, and Felix does it.
Substrait and Fello, answered.
Still deciding? Compare every AI, or read the security and compliance detail.
Is Substrait cheaper than Fello?
Is Felix included in Fello's price?
Do I have to move my database to use Substrait?
Can I use Substrait and Fello together?
Does Substrait call leads the way Felix does?
Which CRMs does Substrait work with?
When is Fello the better choice?
Keep your CRM. Add the AI that works it.
One flat monthly rate by database size. No setup fee, no per-message billing, no per-seat billing.