10 vs Flock Safety
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
10
This app enables law enforcement to make calls to citizens that are more likely to be answered by using local caller ID. It also allows citizens to request callbacks or connect to dispatch, with features like SMS follow-ups and call record retention for professional users.
- Call citizens from local numbers
- Receive and respond to callback requests
- Direct citizens to dispatch
- Set outbound caller ID to "LAW ENFORCEMENT"
- View citizen caller ID in callback requests
- Send automatic SMS follow-up messages
- Retain call records
Read full descriptionHide full description
"I've been in law enforcement for 20 years and I have found a lot of apps that helped me do my job. However this one surpasses them all. Best law enforcement app yet." - NC Police Officer "Top 15 Mobile & Tablet Police Apps" - CriminalJusticePursuit Free 10-21 app users can: - Call citizens from local numbers - Receive and respond to callback requests - Direct citizens to dispatch for immediate assistance 10-21 Police Phone Professional subscribers can: - Set your outbound caller ID to "LAW ENFORCEMENT" - View the citizen's caller ID in callback requests - Send an automatic follow up message via SMS - Retain call records for the life of your subscription 10-21 (radio code for "make a phone call") is a Police App for making free* calls to citizens that GET ANSWERED. Calls are made from local (not blocked) numbers without revealing your personal number. Stop getting sent to voicemail! For example, if you call a citizen in Miami area code (305), they will receive an incoming call from a local (305) number, regardless of where you are. They are more likely to answer that call on your first try. If the citizen calls back, rather than bugging you off-duty, they will be prompted to "Press 1 to Request a Call Back" (via Push Notification) or "Press 0 to Reach a Dispatcher" (connects to a non-emergency number that you provide). When citizens request a call back, you receive a Push Notification on your phone rather than a phone call. At your convenience, simply tap the notification to initiate a call back out to the citizen. *Calls are made over a VoIP data connection and do not use your cellular minutes. While the data used is minimal, data usage fees from your provider may apply. Terms of Use: https://app.10-21.com/terms/phone
Flock Safety
This app provides law enforcement and security personnel with real-time alerts and insights. It offers instant License Plate Recognition and audio detection, along with tools for vehicle lookup and hot list verification. The app ensures users receive critical information precisely when they need it, tailored to their duty shifts and locations.
- Real-time LPR alerts
- Real-time audio detection alerts
- License plate lookup
- Shift mode for duty-specific alerts
- Notifications by radius
- Hot list verification via image upload
Read full descriptionHide full description
Flock Safety empowers officers and security personnel to be at their best, wherever duty takes them. In a job where precision and timeliness are paramount, the Flock Safety mobile app delivers quick, reliable information to stay a step ahead. Get instant LPR (License Plate Recognition) and audio insights, specifically tailored to your location and shift timings. No more outdated information; get the data you need, right when you need it. Real-Time Hot List Alerts: Receive immediate, clear images of vehicles and their plates, ensuring rapid and accurate identification of vehicles of interest. Real-Time Audio Detection Alerts: Instantly access and replay crime-related audio clips such as gunshots or sideshow sounds, pinpointing the exact location directly within the app for timely response. License Plate Lookup: Gain quick access to vital information with our efficient license plate lookup. Know more about a vehicle of interest from the convenience of your mobile device. What else you can do with Flock Safety: • Shift Mode: Ensure that critical alerts reach you only when you're on duty. Stay focused, stay informed. • Notifications by Radius: Select the distance to be alerted by, so that no matter where you go, the alerts you receive are pertinent and actionable while you are on shift. • Hot List Verification via Image Upload: Snap. Upload. Confirm. Eliminate guesswork by simply taking a photo of a vehicle to determine its relevance to ongoing investigations.
Screenshots
Verdict
The clearest difference is rating: Flock Safety at 4.9 against 10's 3.7. Flock Safety also leads on in-app purchases (none vs 2) and ads (none vs shown). On price, device support 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. 10 sells 2 in-app purchases, starting at $4.99 per month. Flock Safety asks for nothing beyond the download.
Flock Safety holds the better App Store score, 4.9 against 3.7. That said, the two scores are not equally well evidenced: Flock Safety has 7.6K ratings behind it against 197, so its average is the more settled of the two. Written reviews point the same way: 39% of 10's written reviews are positive against 61% of Flock Safety's.
10 ships an update every 2 months, Flock Safety fortnightly. The most recent releases landed on September 7, 2026 and September 24, 2026 respectively.
| Parameter | 10 | Flock Safety |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (197 ratings) | 4.9 (7.6K ratings) — better |
| Positive reviews | 39.5% of reviews | 60.7% of reviews — better |
| Number of ratings | 197 | 7.6K — better |
| Update frequency | Every 2 months | Fortnightly — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | Free — better |
| Devices | iPhone | iPhone, Apple Watch — better |
| Requires iOS | 18.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 67 MB | 188 MB |
| Age rating | 4+ | 4+ |
| Developer | Motorola Solutions, Inc | flock group inc |
Customer experience
10
Flock Safety
User reviews
10
From 197 App Store ratingsWhat we love
- 🔒 Privacy protection - keeps personal number hidden from citizens
- 📞 Increases answer rates - real numbers get more responses than blocked calls
- 👍 User-friendly interface - easy to use and navigate
- 💼 Professional separation - maintains work/personal boundary
- 🎯 Callback notification system - alerts users when recipients call back
Room to improve
- 🐛 Frequent call connection failures - calls won't connect or drop unexpectedly
- 🔊 Poor audio quality - voice cuts out, distorted, or garbled
- 🐛 App crashes - causes phone to restart or requires force closing
- 🐛 Server connection errors - unable to connect to server despite good internet
- 📧 Email verification issues - confirmation emails not sent or domain validation problems
Flock Safety
From 7.6K App Store ratingsWhat we love
- 🚀 Fast and easy to use
- 👍 Great system
- 👍 Excellent product
- 👍 Well-integrated alerts
- 👍 User-friendly app
Room to improve
- 🔒 Invasion of privacy concerns
- 🐛 Occasional miss-reads
Bugs and requests
10
Reported bugs
15 issues- App crashes entire phone requiring restart
- Confirmation emails not being sent
- Work email domains incorrectly rejected as invalid
- Server connection failures persisting for months
- Audio cutting out or becoming one-way during calls
Show 10 moreShow fewer
- Calls dropping mid-conversation
- App requires force close after each call to make another
- Calls show as connected on recipient end but not on caller end
- Calls not going through despite full signal
- App stops working after recent updates
- Password reset functionality broken
- Premium features inaccessible after payment
- Service restricted error message appearing
- Calls only work 3 times before app stops functioning
- Spam data collection causing increased telemarketing calls
Requested features
8 requests- SMS/texting capability for users
- Individual call recording for premium subscribers
- Expand caller ID titles (Arson Investigator, Bomb Squad, etc.)
- Custom unit or office designation options
- Persistent callback number for CI relationships
Show 3 moreShow fewer
- EMS/Paramedic access to app
- Remove personal name from auto-text notifications
- Persistent individual phone number for frequent contacts
Flock Safety
Reported bugs
1 issue- No way to hotlist a vehicle through the app
Requested features
4 requests- Option to input miss-reads
- Ability to change alert types from app
- Suppress hit option
- Search by vehicle description
In-app purchases
10
- 10-21 Professional Monthly$4.991 Month
- 10-21 Professional Yearly$49.991 Year
Flock Safety
No in-app purchases








