Harp Guru vs Locksley
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Harp Guru
This app provides interactive visualizations to help harmonica players understand instrument layouts, explore musical possibilities, and internalize patterns for confident improvisation. It guides users past discordant tones and supports various scales, tunings, and valving setups.
- Interactive harmonica layout visualizations
- Explore musical possibilities and limitations
- Internalize mental models for improvisation
- Guide past discordant tones
- Comprehensive scales and tunings list
- Support for valving setups
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Building a working knowledge of a harmonica's layout is a real challenge. New players struggle to make sense of basic patterns, and even experienced players can find themselves lost in higher registers or different keys. The Harp Guru gives you interactive visualisations to: - Help you understand how your harmonica is laid out - Show you the possibilities and limitations of each position - Show you the possibilities and limitations of each harmonica - Move your licks between registers with confidence - Guide you past the discordant tones during improvisations - Act as reference in all situations before you have a perfect mental model Then Harp Guru helps you internalise all of this in to a mental model so you can improvise and change key confidently with your eyes closed. There will always be another harmonica layout or position to learn though, and Harp Guru will be able to help, whatever combination you need to work on. Featuring a comprehensive list of scales & tunings, all with the option to add valving setups. Find complete list of features and instructions on how to get the most out of Harp Guru at https://www.youtube.com/channel/UC_uFG-i4MZeFE3JYoFv0R0A
Locksley
This app provides quick reference information for locksmiths, covering mortice lock identification, gearbox identification, high security cylinders, and hinge adjustment guides. It serves as a digital sidekick for professionals in the trade.
- Mortice lock identification
- Gearbox identification
- High security cylinder guides
- Hinge adjustment guides
- Quick reference information
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Locksley is your personal locksmith sidekick, containing quick reference information for mortice lock identification, gearbox identification, high security cylinders, hinge adjustment guides and more. Terms of use: https://locksley.app/_terms.html
Screenshots
Verdict
The clearest difference is price: Locksley at Free against Harp Guru's $4.99. Locksley also leads on rating (5.0 vs 3.8) and review sentiment (80% vs 67%). On ratings volume, ads, in-app purchases 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
Locksley is free to download; Harp Guru costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Locksley holds the better App Store score, 5.0 against 3.8. Both are backed by a comparable volume of ratings — 6 and 5 respectively. Written reviews point the same way: 67% of Harp Guru's written reviews are positive against 80% of Locksley's.
Harp Guru ships an update every 6 weeks, Locksley every 3 weeks. Both last shipped on October 24, 2026.
| Parameter | Harp Guru | Locksley |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 3.8 (6 ratings) | 5.0 (5 ratings) — better |
| Positive reviews | 66.7% of reviews | 80.0% of reviews — better |
| Number of ratings | 6 — better | 5 |
| Update frequency | Every 6 weeks | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.4 | 14.0 — better |
| Further details — not scored | ||
| Size | 39 MB | 528 MB |
| Age rating | 4+ | 4+ |
| Developer | Joseph Sinfield | Locksley.app LLP |
Customer experience
Harp Guru
Locksley
In-app purchases
Harp Guru
No in-app purchases
Locksley
No in-app purchases









