E vs Delvr
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
E
Learn jazz guitar with practical, step-by-step lessons covering chords, progressions, and substitutions. This course is designed for intermediate players looking to understand jazz concepts without overwhelming theory.
- Step-by-step jazz guitar lessons
- Covers chords and progressions
- Includes theory, tips, tabs, and video
- Explains chord embellishments and substitutions
- Learn to create own jazz chord progressions
- Lessons inspired by jazz standards
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Discovering Jazz Guitar A practical introduction to jazz guitar — without getting lost in theory (or in your own fingers). Understand jazz chords and progressions with step-by-step lessons inspired by jazz standards, from Classic Jazz to Brazilian and Gypsy Jazz. This course is designed for beginners in jazz: you’ll learn real concepts and how to use them. It’s not a “first guitar” course though — you should already be comfortable with basic chords and basic rhythm (changing chords in time). What’s inside: 8 lessons with a gradual increase in difficulty. For each lesson: theory, tips, tabs, and video. Learn chord embellishments, diatonic substitution, and tritone substitution. Understand how to create your own jazz chord progressions. Lesson 1 — Jazz Chords Jazz chords built from the major scale. II–V–I chord changes in G and C. Introduction to walking bass. Lesson 2 — II–V–I Progression Using the major scale in progressions. Chord embellishment. The diminished chord. Lesson 3 — Changing Key Find II–V–I in multiple keys. Chord roots on the E and A strings. Lesson 4 — More Chord Movement Diatonic substitution. Secondary dominants. Cycle of fifths. Triads and tetrads. Lesson 5 — Tritone Substitution Tritone substitution in context. 11th and 13th chords. Practical fingerings. Lesson 6 — Blues for Clara From a traditional 12-bar blues to a richer form. 9th and 13th chords. Lesson 7 — Gypsy Swing Gypsy Jazz rhythm fundamentals. Major and minor 6th chords. Lesson 8 — Sunny Bossa Bossa Nova rhythm pattern. Using substitutions to color progressions.
Delvr
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How Delvr Works Delvr helps you understand any topic through layered explanations: • Simple – a clear, plain-language overview • Why / How – deeper context and reasoning • Expert Peek – a more advanced look for curious learners Users can enter a question and immediately explore explanations at different depths, all within a single flow. Access & Usage • Delvr is currently fully free to use. • No account, login, or subscription is required. • All explanation layers are available without restrictions.
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Verdict
The clearest difference is in-app purchases: Delvr at none against E's 1. Delvr also leads on update cadence (fortnightly vs every 3 months) and iOS requirement (15.1 vs 17.6). On price, ads and device support 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. E sells 1 one-off in-app purchase. Delvr asks for nothing beyond the download.
E ships an update every 3 months, Delvr fortnightly. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.
| Parameter | E | Delvr |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 57.1% of reviews | — |
| Update frequency | Every 3 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 203 MB | 38 MB |
| Age rating | 4+ | 4+ |
| Developer | David Palmerio | Maevin Labs LLC |
In-app purchases
E
- Full Access$3.99
Delvr
No in-app purchases









