RateStack vs. Mortech
Mortech (Zillow Group) is a long-standing pricing and rate-tools vendor with deep ties into the Zillow consumer marketplaces. RateStack is the alternative for teams who want a focused capital-markets PPE without the consumer-marketplace dependency.
Trademark used descriptively for comparison (nominative fair use). We describe Mortech by its publicly-known category posture; for current product specifics, see Mortech. If anything below is inaccurate, please email editorial@ratestack.com and we'll correct it.
Published
Mortech sits in an interesting position in the market: a pricing engine owned by a consumer-mortgage-marketplace company. For brokers and retail LOs whose lead flow comes through Zillow's properties, the integration value is real. For correspondents, mini-correspondents, and lock desks who don't depend on consumer marketplaces, the integration value is irrelevant — and you're mostly comparing pricing engines on their merits.
RateStack's pitch against Mortech: a more focused product on capital-markets workflows (lock subsystem, sell-side pricing, comp/margin hierarchy, MISMO import), modern audit substrate (versioned ratesheets, hash-chained audit, replay), and an open integration surface that doesn't depend on a marketplace relationship.
Side-by-side
Honest, structured comparison.
How RateStack and Mortech compare on the dimensions buyers ask us about most. Cells marked "depends" are configurable in one or both products; verify with each vendor before deciding.
Pricing engine
Multi-mode pricing (BEST_EX / BY_RATE / BY_PRICE)
- RateStack
- Mortech
- Depends
Per-rule adjustment trace
- RateStack
- Mortech
- Depends
Historical replay
- RateStack
- Mortech
- Unknown
Multi-investor BEST_EX in one call
- RateStack
- Mortech
- Depends
Lock & secondary
Full lock lifecycle with journal
- RateStack
- Mortech
- Depends
Sell-side pricing
- RateStack
- Mortech
- Depends
Comp & margin hierarchy
- RateStack
- Mortech
- Depends
Marketplace & retail integrations
Zillow consumer marketplace integration
- RateStack
- Mortech
Native broker-portal experience
- RateStack
- Partial
- Mortech
Public REST + GraphQL API
- RateStack
- Mortech
- Depends
Audit & compliance
Hash-chained audit log
- RateStack
- Mortech
- Unknown
Versioned ratesheets with rollback
- RateStack
- Mortech
- Depends
PII redaction on logs
- RateStack
- Mortech
- Depends
Counterintuitive
When Mortech is the better choice.
We don't pretend to be the right answer for everyone. Here's where we'd point you elsewhere.
Mortech is the better choice when:
- Your business depends on Zillow lead flow. The native marketplace integration is the differentiator; we don't replicate it.
- Your operations are primarily retail LO + broker focused and you don't have meaningful capital- markets / lock-desk / secondary needs that would benefit from RateStack's deeper subsystems.
- You want a vendor with a long history of working with brokers and retail LOs at scale.
We compete when the buyer's priorities are capital-markets- grade audit, lock subsystem, sell-side pricing, and an open API surface independent of any consumer marketplace.
If you decide to migrate
What a switch actually looks like.
The realistic timeline, the integration surfaces, the data you'd port over.
Migration patterns from Mortech to RateStack are similar to other vendor migrations: parallel pricing for two weeks, shadow production for two weeks, cutover. The key migration question is usually whether you're also moving away from Zillow lead flow (which would happen separately and isn't our problem) or simply changing pricing engines while keeping marketplace relationships.
Frequently asked
What buyers ask us.
Does RateStack integrate with Zillow?
Not natively as a marketplace. Zillow is a lead source and a marketplace ecosystem; RateStack is a pricing engine. If your lead flow includes Zillow leads, the leads would still come through your existing Zillow tooling; RateStack handles the pricing once the lead lands in your LOS.
Is RateStack a fit for brokers without capital-markets needs?
It can be — see /solutions/brokers — but if your operations are purely retail with no lock-desk or secondary work, you may not be using the deeper subsystems we invest in. Talk to us about whether we're worth the switch from your current setup.
Other comparisons
See how we stack up against the rest of the market.
See it on your data
Skip the rest of the comparison shopping.
Show us your top scenarios and your investor pack. We'll run them on a sandbox, walk you through the trace, and tell you honestly whether RateStack is the right choice.