VocalClock vs Sigmakey
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
VocalClock
This app announces the time aloud at custom intervals, even when your screen is locked. It helps you stay focused by providing passive time awareness without interrupting your current task or app.
- Announces time at custom intervals
- Runs in the background with screen locked
- Adjustable announcement frequency
- Customizable phrases before time announcement
- Smart scheduling for specific days/times
- Natural-sounding Siri voices
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Stop checking your phone just to see the time. VocalClock announces the time aloud at any interval you choose, and keeps working even when your screen is locked. Stay focused, stay present, and let time come to you. STAY IN FLOW Lock your phone. Play music. Switch apps. VocalClock runs in the background and speaks the time without interrupting what you're doing. No more breaking concentration just to glance at the clock. ANY INTERVAL YOU NEED Set announcements from seconds to hours: • Every 30 seconds for precision timing • Every 5 minutes during workouts • Every hour while working • Any custom interval that fits your routine SPEAK IT YOUR WAY • Add a custom phrase before the time • Hear just the time if you prefer • Enable seconds for exact precision • Choose from natural-sounding Siri voices SMART SCHEDULING You don’t need announcements all day. VocalClock speaks only when you want it to: • Choose specific days of the week • Set active start and end times • Delay the start for future sessions DESIGNED FOR • Workouts and interval training • Cooking and task timing • Deep work and productivity • Meditation and mindfulness • Presentations and speaking practice • Anyone who wants passive awareness of time Simple. Reliable. Built to just work. Questions? Email us at: vocalclock.app@gmail.com
Sigmakey
This utility provides a specialized keyboard for typing mathematical expressions, including fractions, roots, and Greek letters, directly within any app. It supports LaTeX, Unicode, and image output, with on-device processing for privacy and speed.
- Full math keyboard layout
- Two-dimensional cursor for exponents/numerators
- Type LaTeX, Unicode, or rendered image
- On-device typesetting, no network required
- Symbol search, recent, and favorite symbols
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Sigmakey is a math keyboard for people who need to type actual math, anywhere you can type at all. Fractions, exponents, roots, Greek letters, and matrices sit one tap away, and the cursor moves right into a numerator or an exponent, so scientific notation looks the way it should. - A full math keyboard layout that works in any app with a text field - A two-dimensional field with a cursor that steps into fractions and powers - Type LaTeX, plain Unicode, or a rendered image, whichever the app expects - Everything typeset on device, with no network - Search for a symbol, or grab a recent or a favorite Drop an equation into a note, a message, or a homework app without hunting through menus. Privacy Policy: https://docs.google.com/document/d/e/2PACX-1vTDX9pxPOlUJl_skVUHPi99mAw0y2B2BYd_v1mJkoF3xW3rlOcW5KlYd4t93MMbbGhctSTnBTy7d_l6/pub Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is rating: VocalClock at 4.8 against Sigmakey's 2.0. VocalClock also leads on in-app purchases (none vs 1) and ratings volume (4 vs 1). 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. Sigmakey sells 1 one-off in-app purchase. VocalClock asks for nothing beyond the download.
VocalClock holds the better App Store score, 4.8 against 2.0. Both are backed by a comparable volume of ratings — 4 and 1 respectively.
| Parameter | VocalClock | Sigmakey |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (4 ratings) — better | 2.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 4 — better | 1 |
| Update frequency | Every 10 days | — |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.6 — better | 26.0 |
| Further details — not scored | ||
| Size | 5 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Khuyen Duong | Andrii Bashta |
Customer experience
VocalClock
Sigmakey
In-app purchases
VocalClock
No in-app purchases
Sigmakey
- Sigmakey Pro$9.99









