Comparison

E vs Delvr

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

Delvr

Features
Read full description

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.

Screenshots

E4 screens
Delvr4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. E sells 1 one-off in-app purchase. Delvr asks for nothing beyond the download.

UpkeepUpdate frequency

E ships an update every 3 months, Delvr fortnightly. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

Scorecard3 real differences · 5 level
E versus Delvr: the parameters behind the verdict, then further details
ParameterEDelvr
PriceFreeFree
Positive reviews57.1% of reviews—
Update frequencyEvery 3 monthsFortnightly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.615.1 — better
Further details — not scored
Size203 MB38 MB
Age rating4+4+
DeveloperDavid PalmerioMaevin Labs LLC

In-app purchases

1 purchases

E

One-time1
  • Full Access$3.99
None

Delvr

No in-app purchases

Questions

Is E free?
E is free to download, with in-app purchases available.
Is Delvr free?
Delvr is free to download, with no in-app purchases.
Do E or Delvr have ads?
Neither E nor Delvr shows ads.
Which is updated more often, E or Delvr?
E ships an update every 3 months, and Delvr fortnightly. Most recently, E was updated on November 1, 2026 and Delvr on October 30, 2026.

Other comparisons