BTR AMP
Doppler 3 is a beautifully designed local music player for $9, one-time — the best pick if your library is modest and you refuse subscriptions on principle. BTR AMP also offers a one-time option ($59.99 lifetime) and earns the difference at scale: custom tabs, smart playlists, custom tags, EQ, and volume normalization built for 50,000+ song libraries.
These two are philosophical cousins — both offline-first, both anti-lock-in, both with real metadata editing. The choice mostly comes down to library size and how much organizational machinery you want.
At a glance
| Doppler 3 | BTR AMP | |
|---|---|---|
| Price (as of July 2026) | $9 one-time (free trial) | Free tier · Pro $3.99/mo or $59.99 lifetime one-time |
| Formats | FLAC, MP3, WAV, AAC, M4A, more | 15 formats incl. DSD (to DSD256), APE, TTA, WV + M3U |
| Hi-res / USB DAC | Not in listing | ✅ 96kHz/24-bit and beyond; bit-perfect DSD via DoP |
| Import | Wi-Fi, Files/cloud, folder import, auto-import | Wi-Fi/WebDAV, SMB, Google Drive, OneDrive, AirDrop, AutoSync |
| Custom navigation | Standard views + collections | ✅ Custom tabs + per-section layouts |
| Smart playlists | ❌ Not in listing | ✅ Rules-based, auto-refreshing |
| Custom tags | ❌ | ✅ |
| Metadata editing | ✅ Plus artwork search | ✅ ID3, MP4/iTunes, APE, Vorbis |
| Equalizer | ❌ Not in listing | ✅ 10-band + 20+ presets |
| Volume normalization | ❌ Not in listing | ✅ ReplayGain + Sound Check |
| Gapless | ✅ | ✅ Plus crossfade & forced-gap |
| Last.fm scrobbling | ✅ | ✅ |
| CarPlay | ✅ | ✅ With your custom tabs |
Choose Doppler if…
- Your library is hundreds of albums, not tens of thousands — at that size, standard navigation works fine and Doppler’s design shines.
- You want the cheapest ownable option: $9 once is honest, excellent pricing.
- You value its niceties: automatic artwork search, listening reports, careful accessibility work.
Choose BTR AMP if…
- Your collection has hit the point where navigation is the problem — custom tabs, smart playlists, and tags exist precisely for libraries that outgrow Artists/Albums/Songs.
- You want sound tools: a 10-band EQ, ReplayGain/Sound Check normalization across mixed-era rips, and hi-res output through a USB DAC — none of which appear in Doppler’s listing.
- You need network import at scale: SMB shares and WebDAV move a whole library with folders intact; no iTunes involved.
- You have oddball formats — APE, Musepack, TTA, WavPack — from decades of ripping.
The honest version
Doppler is what we’d recommend to a friend with 3,000 well-tagged songs who wants a lovely player for $9 and nothing to configure. BTR AMP’s free tier already plays your whole library offline in any format; Pro exists for the organizational and audio machinery serious collections need. Try both trials against your actual library — size will decide for you. (Everything BTR AMP does.)
FAQ
Is Doppler really one-time? Yes — Doppler 3 is $9 one-time as of July 2026, with a free trial. BTR AMP’s equivalent is the $59.99 lifetime unlock; there’s also a free tier and subscriptions from $1.99/week.
Do both play FLAC? Yes. (FLAC on iPhone, explained.)
Do both edit metadata on the phone? Yes — both include on-device tag editing; Doppler adds artwork search, BTR AMP covers more tag families (ID3, MP4/iTunes, APE, Vorbis).
Doppler facts from its App Store listing as of July 2026. BTR AMP facts reflect the current App Store version.