Merlin Bird ID vs Duolingo
Which is better in 2026? Five scores, side by side.
Merlin Bird ID is the better app overall, scoring 9.0 to 8.9. Merlin Bird ID wins on 2 of the 5 scores, Duolingo on 3.
Beginner and backyard birders, hikers and curious kids
Beginners who want a fun, low-pressure daily habit in a new language
Score by score
The details
| Feature | Merlin Bird ID | Duolingo |
|---|---|---|
| Category | Learning | Learning |
| Category rank | #2 of 10 | #3 of 10 |
| Developer | Cornell Lab of Ornithology | Duolingo |
| Pricing | Free | Free + paid plans |
| Usable for free | Yes | Yes |
| iPhone & iPad | ✓ | ✓ |
| Android | ✓ | ✓ |
| Web | — | ✓ |
Common questions
Is Merlin Bird ID better than Duolingo?
Merlin Bird ID is the better app overall, scoring 9.0 to 8.9. Merlin Bird ID wins on 2 of the 5 scores, Duolingo on 3.
Which is cheaper, Merlin Bird ID or Duolingo?
Merlin Bird ID: Completely free, funded by Cornell Lab members and supporters. Duolingo: Free with ads and Energy limits; Super and Max subscriptions remove them. On value for money, Merlin Bird ID scores higher.
Do Merlin Bird ID and Duolingo work on the same devices?
Only Duolingo runs on Web.
Which is more private, Merlin Bird ID or Duolingo?
Merlin Bird ID scores higher on privacy (9.0/10). App Store label: no tracking, and only a user ID is linked to you. Email, coarse location and usage are collected without your identity. Google Play says no data is shared.
Strengths and weaknesses
Merlin Bird ID
- Free, with no ads or in-app purchases
- Identifies birds by sound in real time
- Works offline once you download a region
- Only covers birds
- No Mac, Windows or web version
- Some users report glitches saving sightings
Merlin answers the question every backyard birder asks. Hold up your phone and Sound ID names the birds singing around you as they sing, snap a picture for Photo ID, or answer five quick questions about what you saw. Download a Bird Pack and it works with no signal. It's free with no ads, built by the Cornell Lab of Ornithology. It only does birds, but it does them brilliantly.
Full Merlin Bird ID review
Duolingo
- Free tier covers full courses, not just a sample
- Short lessons fit into any spare five minutes
- Habit features really do keep you practicing daily
- Open-ended speaking practice mostly sits behind paid plans
- Free version has ads and an Energy limit on practice
- Its App Store privacy label lists heavy cross-app tracking
Duolingo is the easiest way to build a daily language habit. Lessons take a few minutes, streaks and leagues keep you coming back, and the free tier covers whole courses. It teaches math, music and chess too. The catch: it is better at recognition than real conversation, free users get ads and an Energy cap, and it tracks a lot. Start here, then add a speaking app or tutor when you want fluency.
Full Duolingo review
