blackbx vs Respondr PTT
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
blackbx
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blackbx is a simple, password-secured bookmark manager β designed for people who value discretion. Save any link, article, or video behind a password-protected wall. Whether itβs work-related research, niche content, or personal favorites, blackbx gives you full control over what stays visible β and what doesnβt. Biometric authentication Only you can access your bookmarks β with biometric authentication (FaceID / Fingerprint) Distraction-free interface No ads. No social features. Just a clean, minimal space to store what matters. Fast & easy bookmarking Save links in seconds β directly from the browser Organize & enjoy your way Group your bookmarks into folders and enjoy them without leaving any traces via the in-app browser Who is blackbx for? For anyone who wants to securly save links. Researchers, privacy-conscious users, and yes β even those with more discreet browsing habits. blackbx doesnβt judge. It just keeps your bookmarks safe. Download blackbx and take back control of your digital space. Privacy Policy: https://blackbx.app/privacy-policy Terms & Conditions: https://blackbx.app/terms-conditions
Respondr PTT
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Respondr PTT turns any smartphone, tablet or desktop into a secure, always-on two-way radio built for mission-critical teamwork. Tap once and talk live to a single colleague, a fleet or the whole organisation over Wi-Fi, LTE, 5G or even EDGE/2G. Our ultra-low-latency engine ( under 300 ms) keeps conversation natural while advanced voice compression slashes data use. Key benefits β’ Instant, encrypted voice β TLS transport plus optional AES-256 end-to-end encryption protect every word. β’ Works when coverage drops: messages queue offline and auto-deliver on reconnection. β’ Cross-platform β Smartphones, tablets, desktop computers, and ruggedized field hardware all share the same channels seamlessly. β’ Unlimited, dynamic talk-groups that dispatch or supervisors can create, rename and archive in seconds. β’ Location & playback: view live GPS, replay recent calls and search transcripts from the Respondr Dispatch console. β’ Accessory-friendly β wired headsets, shoulder mics, Bluetooth PTT buttons, vehicle mounts. β’ Scales instantly from a single site to global operations with no repeaters or base stations to buy. Typical use cases β’ Public safety & emergency response β’ Logistics, transit & fleet coordination β’ Utilities, manufacturing & field maintenance β’ Event security, retail & warehouse ops Why upgrade from traditional radios? Respondr preserves existing DMR, TETRA and analog investments via seamless patching, yet frees your team from range limits and costly spectrum licences. Enjoy crystal-clear audio, global reach and enterprise-grade admin controls from a single app. Start in minutes Install the app and create your organisation. Invite teammates with a QR code or link. Push, talk, done! Respondr is developed by Teleproject Srl, trusted by enterprises and governments worldwide for 24/7 mission-critical voice. Visit respondr.net to explore our web-based dispatch console, open APIs and flexible subscription plans.
Screenshots
Verdict
The clearest difference is ads: Respondr PTT at none against blackbx's shown. On price, update cadence, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
blackbx ships an update every 3 months, Respondr PTT every 2 months. Both last shipped on October 28, 2026.
| Parameter | blackbx | Respondr PTT |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | Every 2 months β better |
| Ads | Yes | No β better |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad, iPod β better |
| Requires iOS | 15.1 β better | 16.0 |
| Further details β not scored | ||
| Size | 32 MB | 38 MB |
| Age rating | 17+ | 4+ |
| Developer | Caligula Capital UG (haftungsbeschraenkt) | Teleproject Srl |
In-app purchases
blackbx
No in-app purchases
Respondr PTT
No in-app purchases









