SynQR vs Höllentor
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SynQR
This utility helps synchronize audio and video playback by accurately measuring real-time offsets. It assists users in adjusting their setups for perfect synchronization, especially in Digital Audio Workstations and Non-Linear Editors.
- Real-time offset measurement
- Synchronization adjustment
- Supports DAWs and NLEs
- Uses film leaders/test videos
- Downloadable test materials
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Are you struggling with out-of-sync video playback? Do you feel uncomfortable guessing your DAW's video offset based on a 2-pop? Say goodbye to guesswork. With SynQR, you can measure the video offset of your playback system in real-time. In DAWs and NLEs, audio and video are processed on separate hardware. This often leads to latencies that result in synchronization issues. Additionally, different video codecs can introduce varying offsets too. SynQR is a tool that accurately measures these offsets and displays them in real-time. Armed with this information, you can easily adjust your setup to achieve perfect synchronization. SynQR uses classic film leaders or special test videos for measurement, which can be downloaded at https://synqr.app/downloads. Whether you're using popular editing programs like Pro Tools, Adobe Premiere, Blackmagic Resolve, AVID Media Composer, Final Cut X, Nuendo, or Studio One, the offset information provided by SyncQR helps you make the necessary adjustments and optimally synchronize your audio and video signals. Who is SynQR for? • Sound Designers, Sound Editors, and Re-recording Mixers • Film and Video Editors • Cinema Operators • Home Theater Enthusiasts
Höllentor
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Abandon all hope, ye who enter here. The words over Dante Alighieri's gate of Hell give this app its name: Höllentor, German for "gate of Hell." And how fitting: anyone who has routed a large audio-over-IP network live knows that patching hundreds of channels under time pressure can feel exactly like that. Höllentor is here to change that. Multi-routing by drag and drop Select multiple receivers at once and drag them onto a source — done. What otherwise takes one click per receiver happens in a single gesture. Ideal for the quick reconfiguration between soundcheck and show. Scenes instead of chaos Save complete routing states as named scenes — including labels, colors, and lock status. Choose the exact scope when saving and loading: individual devices, specific channels, or everything. Before applying, you get a preview of every change. Undo. Redo. At last. Route changes, label edits, and scene applications can be undone. With Cmd+Z you work as safely as in a text editor. Focus modes for a clear overview Show only active connections — or only warnings, i.e. routes whose source is no longer visible on the network. Individual warnings can be resolved directly via right-click: "Receive from" opens a three-level menu (device → group → channel), including custom labels. For locked channels, Höllentor asks first — and still lets you decide. Keyboard navigation Arrow keys to move through the matrix, spacebar to connect or disconnect. Shift jumps to the next group, Shift+Cmd to the next device. Clarity through structure Channels in configurable groups, collapsible devices, colors and labels for readable matrices — even with hundreds of channels. The iPhone version is still being optimized and will follow shortly. Höllentor is an independent product. It is not affiliated with, endorsed by, or sponsored by Audinate Pty Ltd. Dante® and Audinate® are registered trademarks of Audinate Pty Ltd.
Screenshots
Verdict
The clearest difference is iOS requirement: Höllentor at 15.0 against SynQR's 17.0. On price, 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
Both are free to download. SynQR sells 4 one-off in-app purchases and Höllentor sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
SynQR ships an update monthly, Höllentor every 5 weeks. The most recent releases landed on November 7, 2026 and November 5, 2026 respectively.
| Parameter | SynQR | Höllentor |
|---|---|---|
| Price | Free | Free |
| Rating | 3.2 (11 ratings) — better | — |
| Positive reviews | 28.6% of reviews | — |
| Number of ratings | 11 — better | — |
| Update frequency | Monthly — better | Every 5 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 74 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Benjamin Hoerbe | Tobias Heide |
In-app purchases
SynQR
- Pro 7 Day TrialFree
- Free Three-Day TrialFree
- One-Year Edu Subscription.$0.99
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- SynQR Pro$39.99
Höllentor
- Höllentor Pro$17.99









