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RoboKiller
What it is
RoboKiller blocks spam calls and filters spam texts on iPhone and Android smartphones. Its predictive algorithm analyzes call metadata in less than a millisecond and blocks calls it identifies as spam before they reach the phone. RoboKiller says its technology is 99% effective at stopping spam calls. Its audio fingerprinting compares robocall recordings in real time with a database of more than 1.5 billion processed phone numbers and millions of audio fingerprints. For unknown callers, Call Screening requests a name and reason for calling so users can decide whether to answer. Answer Bots respond to spam calls with prerecorded messages. Text filtering uses block and allow lists, number reputation, and content analysis; RoboKiller says messages are never stored or shared. The free plan includes a daily-updated blacklist, blocked-call notifications, weekly insights, spam reporting, and Spam Patrol. Answer Bots, Call Screening, and Personal Data Protection require a paid plan. Answer Bots and Call Screening also depend on carrier support for Conditional Call Forwarding. Paid options include $4.99 a month and annual plans at $31.99 a year and $39.99 a year.
For and against
For
- Blocks identified spam calls before they reach the phone
- Filters SMS and MMS using several signals
- Free plan includes spam reports and weekly insights
- Available for iPhone and Android smartphones
Against
- Does not work on landlines or other devices
- Some call features require a paid plan
- Call features require supported Conditional Call Forwarding
The verdict
RoboKiller combines call blocking, caller screening, and text filtering in one smartphone service. The free plan covers basic blocking tools, while some features require a paid plan and compatible carrier support.
Who it suits
RoboKiller suits smartphone users who want to screen calls and filter spam texts. Callers who rely on Answer Bots or Call Screening should check that their carrier and plan support Conditional Call Forwarding.
Plans and prices
Free
Global blacklist · spam notifications · weekly call/text insights · spam reporting
Read 15 Oct 2026 · support.robokiller.com
Premium annual
Custom protection · block/allow lists · caller screening · pause blocking
Read 15 Oct 2026 · app.robokiller.com
Weekly Protection
Recurring billing · cancel anytime · free trial
Read 1 Oct 2026 · app.robokiller.com
Annual plan discount
20% annual-plan discount
Read 1 Oct 2026 · app.robokiller.com
Annual Protection
Recurring billing · cancel anytime · free trial
Read 1 Oct 2026 · app.robokiller.com
On the record
- AI call analysis
- Its predictive call-blocking algorithm analyzes call metadata in less than a millisecond and blocks calls identified as spam before they reach the phone.robokiller.com · read 1 Oct 2026
- Answer Bots
- Answer Bots send callers to prerecorded recordings intended to occupy and deter scammers, and users can listen to the resulting calls.play.google.com · read 15 Oct 2026
- API
- Teltech announced the Call Confidence API in May 2021 to provide businesses with RoboKiller’s machine-learning reputation and blocking signals for phone numbers.ir.iac.com · read 15 Oct 2026
- API capabilities
- The announced enterprise API uses blocklists, audio fingerprinting, call-data analysis, call screening and customer feedback to support robocall mitigation and STIR/SHAKEN programs.ir.iac.com · read 15 Oct 2026
- API documentation
- A public ReDoc endpoint exists for the Enterprise API, but the currently linked production specification returns a 404 error.enterprise-api.robokiller.com · read 15 Oct 2026
- Audio fingerprinting
- Patented audio fingerprinting compares robocall recordings in real time against a database containing more than 1.5 billion processed phone numbers and millions of audio fingerprints.robokiller.com · read 1 Oct 2026
- Call Screening
- Call Screening asks unknown callers to identify themselves and provides a live transcription while the phone is ringing.play.google.com · read 15 Oct 2026
- Carrier compatibility
- The help center says the service works with all carriers in the United States and Canada, while full Answer Bot and screening features require conditional call forwarding.support.robokiller.com · read 15 Oct 2026
- Carrier requirement
- Answer Bots and Call Screening require a carrier and plan that support Conditional Call Forwarding.support.robokiller.com · read 1 Oct 2026
- Company headquarters and founding
- LinkedIn lists Teltech in New York, New York, founded in 2005.linkedin.com · read 15 Oct 2026
- Company legal name
- Crunchbase identifies the legal name as Teltech Systems, Inc.crunchbase.com · read 15 Oct 2026
- Company size
- Crunchbase lists RoboKiller at 51–100 employees, while LinkedIn’s Teltech page displays one employee.crunchbase.com · read 15 Oct 2026
- Documentation and support
- The help center is organized into subscriptions, how-to guides and troubleshooting, with articles covering activation, forwarding, voicemail, blocking and Personal Data Protection.support.robokiller.com · read 15 Oct 2026
- Enterprise coverage
- RoboKiller Enterprise markets protection for mobile, landline and text communications and says its predictive system can identify threats in under 0.01 second.robokiller.com · read 15 Oct 2026
- Enterprise integrations
- Robokiller offers business integrations with SIP and HTTP options and public- or private-cloud deployment.robokiller.com · read 1 Oct 2026
- Free version limits
- The free version includes a daily-updated blacklist, blocked-call notifications, weekly insights, spam reporting, and Spam Patrol, while Answer Bots, Call Screening, and Personal Data Protection require a paid plan.support.robokiller.com · read 1 Oct 2026
- Launch history
- The 2021 API announcement states RoboKiller launched in 2017 and had helped millions of Americans avoid approximately $150 million in phone-scam losses by then.ir.iac.com · read 15 Oct 2026
- Licence
- RoboKiller describes patented and proprietary blocking technology and publishes no open-source code or open-source licence.apps.apple.com · read 15 Oct 2026
