Car comparison
Firefly Firefly vs UMM Alter
A head-to-head comparison with real data from the Portuguese market: average price by registration year, fuel cost, depreciation and available supply.
Firefly
Firefly
€23,999
Average price
Registered in 2026
1 listing for sale
UMM
Alter
€15,178
Average price
Registered 1989–1993
3 listings for sale
PartnerCar history: recorded mileage, accidents and damage, when available. 20% off with the code ENCONTRACARROS. Our link applies the discount for you.
The UMM Alter wins 2 of 2 categories
A summary of the head-to-head with the latest market data.
- Firefly Firefly: €23,999
Cheaper to buy
Average price of recent listings
UMM Alter: €15,178 - Firefly Firefly: 1 listings
More choice on the market
Listings available now, in the chosen years
UMM Alter: 3 listings
Price trend
Average listing price of each model, month by month, over the last year.
Average price over the last 12 months
Side-by-side specs
Every market indicator for both models, side by side.
| Indicator | Firefly FireflyRegistered in 2026 | UMM AlterRegistered 1989–1993 |
|---|---|---|
| Average price (recent listings) | €23,999 | €15,178 |
| Available listings | 1 | 3 |
| Sold listings | 87 | 11 |
| Sample analysed | 88 | 14 |
| Time to sell | No data | No data |
| Estimated annual depreciation | No data | No data |
| Overall market share | 0.01% | 0.00% |
| Average power | 143 hp | 88 hp |
| Most common fuel | Electric | Diesel |
| Average advertised consumption | No data | No data |
| Segment | No data | No data |
Supply by district
Where the listings for each model were over the last 12 months.
| District | Firefly Firefly | UMM Alter |
|---|---|---|
| Porto | 23 | 2 |
| Lisbon | 3 | 4 |
| Leiria | 2 | 2 |
| Braga | 2 | 1 |
| Faro | 0 | 2 |
| Aveiro | 1 | 1 |
| Setúbal | 1 | 1 |
| Coimbra | 1 | 0 |
| Santarém | 0 | 1 |
| Beja | 0 | 0 |
| Viseu | 0 | 0 |
| Guarda | 0 | 0 |
Tap a number to see those listings. We show the 12 districts with the most supply.
Frequently asked questions
The most common questions about the Firefly Firefly vs the UMM Alter, answered with market data.
Which is cheaper: the Firefly Firefly or the UMM Alter?
On average, the UMM Alter is cheaper: it costs about €15,178 (registered between 1989 and 1993), while the Firefly Firefly costs €23,999 on average (registered in 2026). The difference is around €8,820, based on used car listings published on the main Portuguese platforms over the last 12 months.
How much does a used Firefly Firefly cost in Portugal?
A used Firefly Firefly costs €23,999 on average in Portugal, based on listings registered in 2026. The price varies with the registration year, the mileage and the version. Right now we find 1 listing for this model in Portugal.
How much does a used UMM Alter cost in Portugal?
A used UMM Alter costs €15,178 on average in Portugal, based on listings registered between 1989 and 1993. The price varies with the registration year, the mileage and the version. Right now we find 3 listings for this model in Portugal.
How many Firefly Firefly and UMM Alter listings are there in Portugal?
Right now we find 1 Firefly Firefly listings and 3 UMM Alter listings on the main used car platforms in Portugal. These figures are updated daily.
Which is more powerful: the Firefly Firefly or the UMM Alter?
On average, Firefly Firefly cars listed in Portugal have 143 hp and UMM Alter cars 88 hp, so the Firefly Firefly is, on average, the more powerful. Power varies a lot with the engine and the version.
Firefly Firefly listings
UMM Alter listings
UMM Alter
€14,500
Not rated1991 · 194,000 km · Diesel · 76 hp
UMM Alter
€18,000
Not rated1993 · 126,011 km · Diesel · 76 hp
UMM Alter 2.5 TD (6 Lug./Full extras)
€18,500
Not rated1991 · 242,087 km · Diesel · 110 hp
- -13%
UMM Alter 4x4 D
€17,500
Not rated1986 · 159,999 km · Diesel · 100 hp
UMM Alter
€19,700
Not rated1992 · 236,621 km · Diesel · 76 hp
All comparisons
Each of these models head to head with every rival on the Portuguese market.
Want to compare other models? Use the car comparison tool or see the comparisons for every model.
