DelayTool vs RazielReveal
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DelayTool
This application helps musicians and sound engineers calculate precise timing values for musical subdivisions. It automatically updates a table of milliseconds and Hertz based on the entered tempo, ideal for setting up delays and oscillators.
- BPM calculator
- Tempo input and tap tempo
- Automatic table updates
- Calculates milliseconds and Hertz
- Supports common musical subdivisions
- Precise delay and oscillator setup
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DelayTool is a simple BPM calculator for producers, engineers, and musicians. Enter or tap the tempo and watch the table of values update automagically. For each common musical subdivision, you will see times (in milliseconds and Hertz) for the current tempo. Just what you need to precisely set up delays and oscillators!
RazielReveal
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RazielReveal turns songs you own into a private, on-device practice session for singing, guitar, and piano. Import a song and create a synchronized eight-part practice mix: lead vocal, background vocal, lead guitar, rhythm guitar, drums, bass, piano, and other instruments. With RazielReveal, you can: • Shape every part with independent level, pan, mute, and solo controls, synchronized waveforms, meters, seeking, and transport controls. • Adjust playback speed and key to practise at a comfortable pace. • Create vocal, guitar, and piano MIDI guides. Explore them in scrollable, zoomable piano rolls with a spectrum background, bars, beats, lyric words, and chord annotations. • Follow on-device, word-timed lyrics and chords in a singer-friendly sheet. Choose Adaptive lines or Sentence lines, see the current lyric word and chord highlighted, and keep instrumental chord passages readable. • Switch to Bar & Beat Chords for a measure-oriented view. Song-section markers and quick segment tags make it easier to jump between parts of a song. • Connect a AUPHY GT guitar fretboard lights or Litejam Guitar over Bluetooth for illuminated fretboard guidance, or practise with ROLI PIANO / LUMI KEYS with on-screen piano roll and on-screen keyboard. • Save songs and their local analysis for later practice. • Optionally unlock Premium features, including audio and MIDI export, sheet auto-scroll and printing, and song-bundle backup and restore. Purchases are optional and can be restored from the paywall. • Keep your music on your device: separation, analysis, and playback are performed locally. Use only audio you own or have permission to use. Terms of Use (EULA): https://bwinnovationtw.github.io/apps/razielreveal/eula.html
Screenshots
Verdict
The clearest difference is price: RazielReveal at Free against DelayTool's $0.99. RazielReveal also leads on update cadence (every 2 days vs every 23 months) and iOS requirement (17.0 vs 26.0). DelayTool's advantage is in-app purchases (none vs 4) and chart position (#200 vs unranked). On 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
RazielReveal is free to download; DelayTool costs $0.99 up front. RazielReveal sells 4 in-app purchases, starting at $0.99 per 7 days. DelayTool asks for nothing beyond the download.
DelayTool ships an update every 23 months, RazielReveal every 2 days. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.
| Parameter | DelayTool | RazielReveal |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 5.0 (5 ratings) — better | — |
| Positive reviews | 66.7% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 23 months | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | — |
| Best chart rank | #200 — better | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 58 MB |
| Age rating | 4+ | 4+ |
| Developer | Joel Perry | Better World Studio |
In-app purchases
DelayTool
No in-app purchases
RazielReveal
- RazielReveal Premium3 Days trial$0.997 Days
- RazielReveal Premium$1.991 Month
- RazielReveal Premium$9.991 Year
- RazielReveal Premium Lifetime$19.99









