PromptSentry vs SentryBlack
Price, ratings, monetisation and update history for both apps, side by side ā with what reviewers say about each.
PromptSentry
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Detect hidden instructions in documents and images before they manipulate your AI tools. PromptSentry reviews business documents, PDFs, DOCX files, images and pasted text for prompt injection, jailbreak attempts, hidden text and encoded directions that could change how an AI assistant, agent or internal tool responds. Use PromptSentry before uploading or pasting outside content into AI. It helps you catch unsafe AI instructions in contracts, resumes, invoices, vendor files, support tickets, policies, client material, research and internal knowledge base content. Use PromptSentry for: - Business AI safety checks - Document review before using AI tools - Vendor and client document screening - Contract, invoice, resume and support ticket review - Data privacy workflows for sensitive content - Teams using AI assistants, agents, RAG systems and internal tools What you get: - Fast Safe, Suspicious or Dangerous result - Plain-language risk notes - Confidence and source context - Scan history for follow-up review - Adjustable sensitivity for your workflow - Private on-device scanning PromptSentry works as an AI scanner, file scanner and document review tool for professionals who need a simple AI security checkpoint between untrusted content and business AI workflows. Scan first, understand the risk, then decide whether to upload, edit or block the file. PromptSentry supports safer AI work without slowing down your team. PromptSentry is an assistive security tool. Detection is probabilistic and should be used as one layer of your review process.
SentryBlack
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Turn your own iPhone, iPad, or Mac into a private home security camera. Set an old device to watch a room and its screen dims to a discreet dark monitor view ā one that always shows a clear recording indicator, so it is never hidden ā while it detects motion, saves event clips, and streams live to your other devices. Wake it any time with a press-and-hold. PRIVATE BY DESIGN Unlike typical CCTV apps, SentryBlack has no company servers watching your home. Your video stays on YOUR devices and YOUR own private iCloud ā never our cloud, and never a third-party cloud you did not choose. ⢠Live view goes device-to-device and is end-to-end encrypted. ⢠If your network blocks a direct connection, you can optionally add a relay server of your own ā the video through it stays end-to-end encrypted and the relay cannot decrypt it. SentryBlack provides no relay server, and this setting is off unless you fill it in. ⢠Cameras, motion alerts, and clips sync only through your private iCloud. ⢠No account, no sign-up, no tracking. USE ANY DEVICE AS A CAMERA ⢠The screen dims to a dark monitor view with an always-on "REC" indicator and timer ā discreet and power-saving, but never blank. ⢠On-device motion detection saves a clip and snapshot of every event. ⢠Press and hold to wake the screen. MONITOR FROM ANYWHERE ⢠On another device signed into the same iCloud, tap Monitor to see all your cameras. ⢠Get instant push alerts with a snapshot the moment motion is detected. ⢠Watch live video ā fastest on the same Wi-Fi, and end-to-end encrypted everywhere. SENTRYBLACK PRO The free version records with motion detection, sends cross-device alerts, and streams live on your Wi-Fi (with a small banner ad on non-camera screens; iPhone and iPad only ā the Mac app has no ads). SentryBlack Pro adds: ⢠Cloud clip backup to your own iCloud ⢠Unlimited event history ⢠HD live view ⢠Person detection & motion zones ⢠Multiple cameras ⢠No ads Pro is an auto-renewing subscription (monthly or yearly) with a 3-day free trial. One subscription works on iPhone, iPad, and Mac. Payment is charged to your Apple Account; it renews automatically unless cancelled at least 24 hours before the period ends. Manage or cancel anytime in Settings. Note: because Apple stops the camera when an app is in the background or the device is locked, a camera device must stay on and in the app while on duty ā keeping it plugged in is recommended. Please use SentryBlack only to monitor your own property and spaces. Terms: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy: https://mwsupplylimited.github.io/sentryblack/privacy.html
Screenshots
Verdict
The clearest difference is ads: PromptSentry at none against SentryBlack's shown. PromptSentry also leads on update cadence (every 5 days vs fortnightly). SentryBlack's advantage is iOS requirement (17.0 vs 26.4). On price, in-app purchases and device support there is nothing between them.
Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS
Both are free to download. PromptSentry sells 1 one-off in-app purchase and SentryBlack sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.
PromptSentry ships an update every 5 days, SentryBlack fortnightly. The most recent releases landed on October 12, 2026 and October 3, 2026 respectively.
| Parameter | PromptSentry | SentryBlack |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 5 days ā better | Fortnightly |
| Ads | No ā better | Yes |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad | iPhone, iPad, Mac ā better |
| Requires iOS | 26.4 | 17.0 ā better |
| Further details ā not scored | ||
| Size | 378 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | TOLGA BARIS KOC | Matthew Wong |
In-app purchases
PromptSentry
- PromptSentry Ultra$8.99
SentryBlack
- SentryBlack Pro (Monthly)3 Days trial$4.991 Month
- SentryBlack Pro (Yearly)3 Days trial$29.991 Year








