AutoSlash review

AutoSlash works differently from a normal search site. Instead of showing standard rates, it keeps a database of rental coupons and discount codes, then tests hundreds of them against your trip, taking into account groups and memberships you belong to. Because that takes a few minutes, it asks for your email and sends the quote when it is ready. Its second tool may matter more: enter the confirmation number and price of a rental you already booked, even on another site, and AutoSlash keeps checking for lower rates and emails you if it finds one. You then rebook at the lower price and cancel the old reservation. AutoSlash says it has saved customers over $100 million, that users save around 30% compared with other websites on average, and that its free price tracker saves an additional 20% on average. Treat those as the company's own figures. The trade-off is effort: there is no instant results page, and acting on a price drop is up to you.

Who it is for

Patient planners who want discount codes applied for them and alerts when their booked rate falls.

Price

Free quotes and free price tracking.

Consumers who use our free price tracker end up saving an additional 20% on their rental on average.
Quoted from the vendor pricing page on November 9, 2026.

Key features

• Tests hundreds of coupons and discount codes against your rental
• Factors in groups and memberships you belong to
• Emails quotes after its system processes your request
• Tracks an existing reservation and emails you when a lower rate appears
• Works for rentals originally booked on other websites

Strengths and weaknesses

• Strength: Quotes and tracking are free
• Strength: Tracks reservations made elsewhere, so you can keep your booking until a better deal turns up
• Strength: Covers airport and non-airport pickup locations
• Weakness: Quotes arrive by email after a few minutes, not instantly
• Weakness: You must rebook and cancel the old reservation yourself
• Weakness: Savings figures are AutoSlash's own averages

Key facts

• Price: Free quotes and price tracking
• Delivery of quotes: By email
• Tracks outside bookings: Yes, for many rental companies
• Claimed customer savings: Over $100 million to date
• Average saving claimed: Around 30% versus other websites

Where it ranks

AutoSlash is No. 3 in our Best Rental Car Sites verdict.