StrumLab Jam vs DelayJaVu
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
StrumLab Jam
Enhance your guitar practice with a vast library of YouTube backing tracks. Visualize your fretboard in real-time, filter by genre and key, and receive practice reminders. Unlock over 1000 tracks and advanced features with a premium subscription.
- 100+ free backing tracks
- 1000+ premium tracks
- Real-time fretboard visualization
- Genre, key, and scale filtering
- Scheduled practice reminders
- Full fretboard view (0-12 frets)
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StrumLab Jam turns practice into a full-band experience. Jam along with over 100 free backing tracks, or unlock 1,000+ with Premium. Filter by style, mode and key, so you're always playing exactly what you want to play. Premium also lets you jam over generated songs. A full band plays a fresh chord progression in your chosen key, scale and genre, and each chord lights up as it plays. WHAT'S INSIDE • 1,000+ jam tracks across rock, funk, blues and more • Filter by style, from Rock and Funk to Blues and beyond • Filter by mode, from Major and Minor to Dorian and beyond • Filter by key • Generated songs with a full band, swing feels and slash chords • A scale fretboard showing the notes that fit, with root notes highlighted • Play the scale or a pentatonic run, and jump between positions • Choose your fret range, from open position to the 24th fret • Left-handed fretboard and a choice of wood finishes • Streaks and badges to track your progress • Practice reminders to keep you consistent Whether you're working on scales, learning a new mode, or just want to play instead of practising alone, StrumLab Jam gives you a band that's always ready, and the visual feedback to build real improvisational confidence. This is where skills become music. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.strumlab.app/privacy-policy
DelayJaVu
This audio effect plugin creates a unique stereo reverse delay sound. It captures your dry signal and plays it back in reverse, with independent control over left and right channel delay times, modulation, and stereo spread for creative sound design.
- Stereo reverse delay effect
- Independent L/R delay times
- Adjustable modulation
- Variable stereo spread
- AUv3 compatible
- Standalone operation
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DelayJaVu - Stereo Reverse Delay (AUv3) DelayJaVu is an audio effect plugin that can run standalone, or in any AU compatible host application such as Logic Pro or GarageBand. Overview Deja Vu - French for "already seen". The brief, intense and often startling sensation that a current, new experience has happened before. DelayJaVu is a stereo reverse delay with independent delay times for the left and right channels. DelayJaVu works by capturing your dry signal in a delay buffer, which is then read backwards over a time period corresponding to a delay time. As the virtual delay head repeatedly scans back through the delay buffer, you hear segments your original dry signal, repeated in reverse. I think reverse delay is a really cool effect - one of my favourites in fact! I especially like its slightly unpredictable nature, making it a great effect to interact with, as you play. I don't recall seeing any reverse delay plugins with independent times for the left and right channels so that may be something unique that DelayJaVu has to offer. And the addition of modulation and variable stereo spread adds further creative options, while keeping DelayJaVu compact, super easy to use and very DSP-friendly. Controls Mode - Off bypasses the effect and uses a "soft switching" aka "trails mode", to avoid pops and clicks. In L/R Lock mode, the delay time is set to be the same for the left and right channel, and the parameter sliders will be "locked" to the same value when changed. In L/R Free mode, you can set independent delay times for the left and right channel. Time L / R - Sets the delay time for the left and right channels independently, from 250ms to 2.5 seconds. Interesting effects can be achieved by setting the delay times to be close, but not exactly the same. Please note - Unlike a "normal" delay where you will hear the sound repeat after the delay time specified, DelayJaVu doesn't quite work like that. The delay heads for both channels are always in motion and repeat their cycles according to the delay time. This means that sometimes the delay head will be "closer" to the incoming audio. In this case you may hear the first repeat almost straight away, with subsequent repeats occurring at delay time intervals when the Feedback is > 0%. This is especially noticeable (and cool!) when running in Free mode with different delay times. This is also the way many reverse delays are implemented and why this particular design doesn't lend itself to tempo sync delay effects as the repeats will not "quantise" to note length boundaries. Feedback - Sets the feedback / regeneration for the delay on both channels. Mod - Adds a variable amount of modulation to both channels. As each channel is modulated differently, this can produce a nice stereo effect. Spread - At maximum, the left and right delay channels are hard-panned and have their own independent modulation applied. Decreasing the Spread parameter effectively narrows the stereo image of the delay and modulation all the way down to mono. Mix - The mix control goes from 100% dry to 100% wet. At the centre 50% position, the dry and wet signals are evenly balanced. At 100%, you only hear the wet / processed signal. For more info and support please visit: www.waverley-instruments.com/robjackson
Screenshots
Verdict
The clearest difference is price: StrumLab Jam at Free against DelayJaVu's $1.99. StrumLab Jam also leads on update cadence (fortnightly vs every 2 months). DelayJaVu's advantage is rating (5.0 vs 1.0) and in-app purchases (none vs 3). On ratings volume and ads 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
StrumLab Jam is free to download; DelayJaVu costs $1.99 up front. StrumLab Jam sells 3 in-app purchases, starting at $2.99 per year. DelayJaVu asks for nothing beyond the download.
DelayJaVu holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.
StrumLab Jam ships an update fortnightly, DelayJaVu every 2 months. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.
| Parameter | StrumLab Jam | DelayJaVu |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 1.0 (2 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 2 — better | 1 |
| Update frequency | Fortnightly — better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium — better | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 16.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 24 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Gary Harkness | Rob Jackson |
Customer experience
StrumLab Jam
DelayJaVu
In-app purchases
StrumLab Jam
- Pro Plan7 Days trial$2.991 Year
- StrumLab Jam Pro1 Year trial$24.991 Year
- StrumLab All Access1 Year trial$49.991 Year
DelayJaVu
No in-app purchases









