LSTclock vs Tagtory
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LSTclock
This utility app displays local sidereal time for registered locations on iOS, iPadOS, and watchOS. It can also calculate sidereal time and Julian Date for any date and time, and sync locations between devices.
- Local sidereal time display
- Julian Date calculation
- Supports multiple registered locations
- Location sync between iPhone and Apple Watch
- Date and time specific calculations
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LSTclock is an iOS/iPadOS/watchOS app that displays the local sidereal time (LST) at registered location(s). On iOS/iPadOS, it can also calculate LST and Julian Date for any date and time. The list of locations can be synced between iPhone and paired Apple Watch(es).
Tagtory
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Tagtory is the easiest way to organize your physical belongings using NFC tags. SCAN & ORGANIZE Simply tap your iPhone on an NFC tag to instantly see what's inside that box, drawer, or container. No more guessing or opening every bin to find what you need. REGISTER CUSTOM TAGS Write NFC tags with your own data. Label storage containers, tool boxes, moving boxes, and more. Each tag links to a detailed item record with photos, notes, and location. SMART ORGANIZATION • Group items into categories with custom icons and colors • Add photos to remember what things look like • Track scan locations on a map with GPS • Drag and drop to reorder items and groups • Search across all your items instantly ICLOUD BACKUP & RESTORE Back up your entire organization system to iCloud and restore it anytime. Choose from three restore modes — keep local data, use iCloud data, or do a full restore. Your data is always safe in your private iCloud account. SHARE WITH OTHERS Share items with family members or roommates using peer-to-peer sharing — including photos. Perfect for shared storage spaces. No internet required. BUILT FOR YOU • Guided onboarding to get started in seconds • Light and dark mode support • NFC sticker buying guide with product recommendations • Works completely offline — no account or internet needed PERFECT FOR • Home organization and decluttering • Moving and packing • Garage and workshop storage • Craft and hobby supplies • Seasonal decoration storage • Office supply management FREE TO START Get started with up to 10 NFC tags, 3 groups, and 1 photo per item — free forever. Upgrade to Tagtory Pro for unlimited tags, groups, photos, and iCloud backup. PRIVACY FIRST All your data stays on your device and in your private iCloud account. We don't operate servers, run analytics, or track you. Your information is yours alone. Download Tagtory today and finally know exactly where everything is! Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://tagtory.app/privacy
Screenshots
Verdict
The clearest difference is in-app purchases: LSTclock at none against Tagtory's 3. LSTclock also leads on device support (3 vs 1). Tagtory's advantage is update cadence (every 2 days vs every 2 months). On price, ads and iOS requirement 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. Tagtory sells 3 in-app purchases, starting at $2.99 per month. LSTclock asks for nothing beyond the download.
LSTclock ships an update every 2 months, Tagtory every 2 days. The most recent releases landed on September 9, 2026 and September 19, 2026 respectively.
| Parameter | LSTclock | Tagtory |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (10 ratings) — better | — |
| Positive reviews | 54.5% of reviews | — |
| Number of ratings | 10 — better | — |
| Update frequency | Every 2 months | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, Apple Watch — better | iPhone |
| Requires iOS | 17.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 15 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Tsuyoshi Sawada | ZEYI YAN |
In-app purchases
LSTclock
No in-app purchases
Tagtory
- Tagtory Pro Monthly1 Month trial$2.991 Month
- Tagtory Pro Yearly$24.991 Year
- Tagtory Pro Lifetime$39.99









