AvaiBook vs Rentals United: Head-to-Head Comparison
TL;DR: AvaiBook and Rentals United both target short-term rental operators. Pick **[AvaiBook](/avaibook-review/)** if: Spanish-market property managers and owners who want a low per-unit PMS backed by the idealista brand, with native Booking.com/Airbnb/Vrbo channel management and Spanish-market payment processing. Pick **[Rentals United](/rentals-united-review/)** if: Operators on a PMS who need one integration to reach 60+ channels — including long-tail European OTAs most competitors don't cover.
Category: Property Management Software · AvaiBook · Rentals United
At a glance
| AvaiBook | Rentals United | |
|---|---|---|
| Category | Spain-leading vacation rental PMS from the idealista group, with low per-unit pricing and 50+ channel integrations | Global vacation rental channel manager connecting PMS software to 60+ booking channels |
| Founded | 2008 | 2013 |
| HQ | Madrid, Spain | Barcelona, Spain |
| Pricing | from $3/mo | quote-based |
| Best for | Spanish-market property managers and owners who want a low per-unit PMS backed by the idealista brand, with native Booking.com/Airbnb/Vrbo channel management and Spanish-market payment processing. | Operators on a PMS who need one integration to reach 60+ channels — including long-tail European OTAs most competitors don’t cover. |
| Overall | 5.6/10 | 5.4/10 |
Feature-by-feature
| Feature | AvaiBook | Rentals United |
|---|---|---|
| Channel manager | ✅ Native | ✅ Native |
| Unified inbox | ⚠️ Partial | — |
| Direct booking site | ✅ Native | — |
| Task management | ⚠️ Partial | — |
| AI guest messaging | — | — |
| AI that takes actions | — | — |
| Automation rules | ⚠️ Partial | ⚠️ Partial |
| Pricing optimizer | ✅ Native | — |
| Open API | ⚠️ Partial | ✅ Native |
| Mobile app | ⚠️ Partial | — |
| Multi-calendar | ✅ Native | ✅ Native |
| Accounting / reporting | ⚠️ Partial | — |
| Revenue management | ⚠️ Partial | — |
Scores by dimension
| Dimension | AvaiBook | Rentals United |
|---|---|---|
| Ease of use | 5/10 | 6/10 🏆 |
| Features depth | 7/10 | 8/10 🏆 |
| Value for money | 8/10 🏆 | 6/10 |
| Support | 4/10 | 5/10 🏆 |
| AI capability | 2/10 | 2/10 |
| Scalability | 6/10 | 8/10 🏆 |
| Learning curve | 5/10 | 5/10 |
| Pricing transparency | 8/10 🏆 | 3/10 |
Where AvaiBook wins
- Value for money — 8/10 vs 6/10
- Pricing transparency — 8/10 vs 3/10
- Direct booking site — native in AvaiBook, not in Rentals United
- Pricing optimizer — native in AvaiBook, not in Rentals United
Where Rentals United wins
- Scalability — 8/10 vs 6/10
Which one should you pick?
Pick AvaiBook if: Spanish-market property managers and owners who want a low per-unit PMS backed by the idealista brand, with native Booking.com/Airbnb/Vrbo channel management and Spanish-market payment processing. Pick Rentals United if: Operators on a PMS who need one integration to reach 60+ channels — including long-tail European OTAs most competitors don’t cover.
Pick by operator profile
| Profile | Winner | Why |
|---|---|---|
| Solo host (1-5 units) | AvaiBook | Higher profile fit (5.6 vs 5.1). |
| Boutique operator (6-20 units) | Tie | Both score within a rounding error on this profile — pick on pricing and gut. |
| Professional PM (20+ units) | Rentals United | Higher profile fit (6.1 vs 5.5). |
| Enterprise (100+ units) | Rentals United | Higher profile fit (6.0 vs 5.1). |
| Multi-market operator | Rentals United | Higher profile fit (5.7 vs 4.9). |
| Tech-forward, AI-first | Rentals United | Higher profile fit (4.7 vs 4.2). |
| Budget-conscious | AvaiBook | Higher profile fit (7.3 vs 5.3). |
AvaiBook in one paragraph
AvaiBook — Spain-leading vacation rental PMS from the idealista group, with low per-unit pricing and 50+ channel integrations. Strengths: Very low entry price (under €3/unit/month) relative to category; Native idealista group integration for Spanish-market distribution; 50+ channel connections including Booking, Airbnb, Vrbo, Expedia, Google Travel, Rentalia, HomeToGo. Weaknesses: No phone support — messaging-only contact with ~1-day response; Unavailable from Friday afternoon to Monday per user reports. Full AvaiBook review →
Rentals United in one paragraph
Rentals United — Global vacation rental channel manager connecting PMS software to 60+ booking channels. Strengths: Broadest channel catalog in the category — 60+ OTAs including long-tail European channels; Mature two-way XML/REST API used by most major PMSes as their connectivity backbone; Strong coverage of regional European channels (HomeToGo, Holidu, Atraveo, e-domizil). Weaknesses: Not a standalone PMS — requires an underlying system for operations, guest comms, and tasks; Setup can be slow; channel certifications vary in speed. Full Rentals United review →
See also
- All Property Management Software comparisons
- 5stelle vs AvaiBook
- 5stelle vs Rentals United
- AirDNA vs AvaiBook
- AirDNA vs Rentals United
- Amenitiz vs AvaiBook
- Amenitiz vs Rentals United
FAQ
Is AvaiBook or Rentals United cheaper?
AvaiBook publishes entry-level pricing; Rentals United requires a sales call, so the answer depends on the quote you get.
Does AvaiBook have better AI than Rentals United?
AvaiBook and Rentals United score equally on ai capability (2/10).
Which is easier to use, AvaiBook or Rentals United?
Rentals United scores higher on ease of use — 6/10 vs 5/10.
Can I switch from AvaiBook to Rentals United?
Yes, but plan for migration cost: channel reconnections, template rebuilds, automation recreation, and team retraining. Both AvaiBook and Rentals United export reservation history; neither exports their automation rules cleanly. Run both in parallel for at least two weeks before cutting over.