In Progress vs SynthStamp
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
In Progress
This app consolidates all your audio files from various sources into one organized library. It offers advanced playback features, offline key detection, and transposition, with a focus on user ownership and privacy.
- Import audio from multiple sources
- Organize with nested folders and playlists
- Manual queue and playback controls
- Offline key detection and transposition
- A/B looping for producers
- Share playlists offline via AirDrop
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IN PROGRESS — LOCAL AUDIO PLAYER. Pay once. Own it forever Every session leaves a trail of files — demos on your phone, sessions from your DAW, references sent over WhatsApp, ideas recorded at 2am. They're everywhere. In Progress is where they all live YOUR FILES, ONE PLACE. Import from anywhere: Files, iCloud Drive, WhatsApp, AirDrop, Voice Memos, Finder. Share any video from the Photos App, and we extract the audio automatically — no extra steps. Organize with playlists and folders, nested however you think. Sort by name or import date BUILT FOR PLAYBACK: A manual queue - Add any track on the fly, drain it, keep going. Loop one track, loop all, or shuffle. Full lock screen and headphone controls. Beautiful, tactile interface built for daily use. SHARE YOUR MUSIC: Send any playlist to another In Progress user via AirDrop — everything travels together, the playlist and every file inside it — no cloud, no account, no internet. Just tap, and it's there. Works with iMessage and WhatsApp too. KNOW YOUR MUSIC: Detect the musical key of any track instantly — no internet, no upload, processed right on your device. Need to match a reference or play along in a different key? Transpose any track offline, semitone by semitone. The original file is always preserved. Revert anytime. FOR PRODUCERS: Unlock Producer Tools in Settings to go deeper. On the player, swipe the controls left to reveal a second page built for serious listening. Set an A/B loop section with a long press on the scrubber — lock any passage and repeat it until you own it. Control playback speed from 0.5× to 2×, with pitch preserved. Hold to reset to 1×. Everything happens on your device. No internet. No cloud. No waiting. NO SUBSCRIPTIONS. NO ACCOUNTS. NO INTERNET. EVER. Your music lives on your device. Not in someone else's server. Not behind a monthly fee. Download once, own it forever — today, tomorrow, and in ten years. IN PROGRESS — YOUR MUSIC, YOUR RULES. Feature List: - Import from Files app (single files or entire folders) - Import from third-party messaging apps (WhatsApp, iMessage) - Import from Voice Memos - Import from Photos App - Create Playlists - Add your Files to your Playlists - Import Entire Playlists from Other Users - Share Entire Playlists with Other Users - Create Folders of Playlists - Endless Nesting of Folders - Sort Your Music - Lockscreen and Dynamic Island Controls - Shuffle Mode - Loop and Loop One - Double-tap to Skip 5s/ 10s/ 15s - Queue and Add to Queue logic - CarPlay - Small Home Screen Widget - Analyze the Key of your Music (More Info) - Transpose your Music - Trim your Music - Loop Section A/B - Playback Speed (hold for 1x) - Pitch Preservation On/Off - Large Text Setting - Light/ Dark mode - Take Notes on Your Tracks
SynthStamp
Explore vintage synthesizers with fully modeled engines and familiar interfaces. Patch, save, and share your creations across devices. Features real-time effects processing and models based on iconic hardware.
- Fully modeled vintage synth engines
- Patchable semi-modular synthesizer
- Circuit-bendable sampling keyboard
- Real-time effects processing
- Audio Unit (AUv3) plugin support
- Cross-device preset sharing
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The Vintage Synth Playground You Can Take Anywhere SynthStamp is a celebration of the history of electronic music, featuring fully modeled engines and familiar user interfaces behind some of the most desirable synthesizers. Tap and drag to patch, save your patch as a preset, and export presets to share across all of your devices including Mac, iPhone, and iPad. Yes that's right, iPhone. Take your sound anywhere. --- Stereo audio input for realtime effects processing Model based on the ARP 2600--finally on mobile Circuit-bendable model based on the SK-1--we haven't seen one either --- Choose Your Adventure 5001 Analog Synthesizer: dynamically patchable, semi-modular, monophonic analog synthesizer from the late '70s, with stereo preamplifier. A real idea factory, from classic analog synth leads to creative sound design, this synth is a tool for exploration and experimentation. You'll truly fall in love with the snappy, milky quality of the voltage-controlled filter. B500 Sampling Keyboard: circuit-bendable ROMpler from the mid '80s, with 4-voice polyphony, multi-channel note memory, and stereo sampler. Bend, sample, and compose melodies with this portable gem. Combine with continuous live sampling to create sounds that simply shouldn't exist. Flexibly Configurable, Infinitely Creative SynthStamp can be run as a standalone application or as an Audio Unit (AUv3) plugin inside supported DAWs, either as an Instrument with mono side chain input, or as a Music Effect on stereo/mono audio tracks for realtime processing, with full MIDI support. Presets can be imported and exported for easy sharing across devices, while on the same device, presets are stored in a common location across standalone and Audio Unit installations for shared access. Privacy Policy: https://themusicologygroup.com/privacy/
Screenshots
Verdict
The clearest difference is review sentiment: In Progress at 100% against SynthStamp's 50%. In Progress also leads on rating (5.0 vs 4.4) and price ($1.99 vs $4.99). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
In Progress costs $1.99 and SynthStamp $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
In Progress holds the better App Store score, 5.0 against 4.4. Both are backed by a comparable volume of ratings — 9 and 12 respectively. Written reviews point the same way: 100% of In Progress's written reviews are positive against 50% of SynthStamp's.
Both ship on a similar rhythm, roughly every 5 days. The most recent releases landed on September 16, 2026 and September 18, 2026 respectively.
| Parameter | In Progress | SynthStamp |
|---|---|---|
| Price | $1.99 — better | $4.99 |
| Rating | 5.0 (9 ratings) — better | 4.4 (12 ratings) |
| Positive reviews | 100.0% of reviews — better | 50.0% of reviews |
| Number of ratings | 9 | 12 — better |
| Update frequency | Every 5 days | Every 5 days |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad | iPhone, iPad, Mac — better |
| Requires iOS | 17.2 | 16.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 39 MB |
| Age rating | 4+ | 4+ |
| Developer | Guilherme Xavier | The Musicology Group, Inc. |
Customer experience
In Progress
SynthStamp
In-app purchases
In Progress
No in-app purchases
SynthStamp
No in-app purchases









