SpamSlap vs Prime Time NTP
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SpamSlap
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SpamSlap — Block Spam Calls & Filter Junk SMS Tired of unwanted calls and spam text messages? SpamSlap gives you the power to block thousands of spam numbers with a single rule using smart wildcard patterns. CALL BLOCKING WITH WILDCARD PATTERNS Create powerful blocking rules using the # wildcard character. Each # matches any digit from 0 to 9, letting you block entire number ranges at once. Example: +12125551#### blocks 10,000 numbers from +121255510000 to +121255519999 — all with just one rule. SMS FILTERING Filter spam text messages by sender name or keywords. Messages from unknown senders that match your rules are automatically moved to the Junk folder. - Filter by alphanumeric sender name - Filter by keyword (case insensitive) - Works automatically in the background KEY FEATURES - Wildcard pattern system for mass call blocking - Country code picker with 40+ countries - SMS filtering by sender name or keyword - Available in English, Turkish, German, and Spanish - Simple setup with step-by-step instructions - Clean, intuitive interface HOW IT WORKS 1. Add a blocking rule with a number pattern 2. Use # wildcards to match any digit 3. Enable the SpamSlap extension in Settings 4. Enjoy a spam-free phone experience FREE & PREMIUM The free version includes essential blocking features. Upgrade to Premium for unlimited rules and wildcards. SpamSlap requires enabling the Call Blocking & Identification extension (Settings > Phone) and SMS Filter extension (Settings > Messages) to function.
Prime Time NTP
This utility app displays the precise current time, accurate to the millisecond, by querying multiple NTP servers. It offers detailed insights into clock synchronization and network performance, with advanced features available via a one-time purchase.
- Millisecond time display
- Queries multiple NTP servers
- Detailed sync accuracy
- Network performance metrics
- Adaptive polling
- One-time Pro upgrade
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"Prime Time" is a high-precision time app that shows the true time, accurate to the millisecond. It queries NTP servers directly — the same infrastructure that keeps the internet in sync — and works out the correct time from their answers. Your device's own clock is never used for the display. [New in version 1.4] • Display Offset (Pro): run the large clock up to 99.999 seconds ahead of or behind real time, in 1 ms steps — for remote broadcasts, live streams, or any delayed feed. While it is on, the time turns yellow, with the offset above and the actual time below, so there is no mistaking it for real time. Measurements are never shifted. • Server details now use two columns in landscape on iPhone, so everything fits on one screen. • On iPhone with ProMotion, the clock now refreshes up to 120 times a second. [Free — one server, in full detail] • Real-time sync with one NTP server of your choice • Every exchange laid open: address, stratum, reference, root delay, jitter, estimated error, and the last eight exchanges • Millisecond display, refreshed up to 120 times a second on ProMotion screens • Offset and round-trip time with sparkline history • Adaptive polling that eases off as a server proves steady [Pro — one-time purchase, no subscription] • Compare up to 30 servers. With three or more, a server that is off is outvoted instead of skewing the time shown. • Manual sync on demand • Keep the screen awake while the app is open • Display Offset: run the clock ahead of or behind real time A note on accuracy: a round trip is a single number covering two unknown halves, and nothing in the exchange reveals how it was divided. Prime Time widens the reported ± rather than inventing a correction to hide it. On cellular, where the two directions are least alike, that margin is wider — and shown. Made for developers, network engineers, broadcast crews, and anyone curious about how far off their device's clock really is. Available in English, Japanese, German, and French.
Screenshots
Verdict
The clearest difference is iOS requirement: SpamSlap at 18.0 against Prime Time NTP's 26.0. On price, 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
Both are free to download. SpamSlap sells 1 one-off in-app purchase and Prime Time NTP sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
| Parameter | SpamSlap | Prime Time NTP |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | — | Every 6 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | — | Freemium |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 18.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 9 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Serhat KOSE | Kentaro Saito |
In-app purchases
SpamSlap
- SpamSlap Premium$1.99
Prime Time NTP
- Pro Features$4.99









