Investors
Making the phone safe again.
The default phone app was built to connect calls, not to protect people. Cally is built to protect them.
lost to scams worldwide in one year
of adults met a scam in the past year
reported U.S. fraud losses in 2024, a record
Global Anti-Scam Alliance (GASA) and Feedzai, Global State of Scams 2025 | U.S. Federal Trade Commission, Consumer Sentinel Network Data Book
A growing problem with no good default.
U.S. Federal Trade Commission, Consumer Sentinel Network Data Book
Scammers use the phone because the phone does not fight back.
Impersonation, urgency and a request for a code. The attack works in minutes, and people are left to defend themselves alone.
A phone app that protects, identifies and fights back.
Cally replaces the dialer and messages, identifies callers before they ring, detects scam scripts during the call, and can hand the call to Guard, which wastes the scammer's time.
Technology: local first, cloud when it matters.
A layered detection stack where most decisions are made on the phone. This is cheaper to run, faster, and easier to trust.
- 01
Before it rings
On your phoneThe number is checked against a small on-device cache of moderator-reviewed scam numbers. Known scammers can be rejected or silenced before the phone rings.
- 02
Passive monitoring
On your phoneOnce connected, acoustic cues such as speaking rate, relentless pressure and synthetic-sounding speech artifacts are measured locally. No audio leaves the phone.
- 03
Live Guard
Cloud, opt-inYou turn it on from its own consent screen. Speech is transcribed on-device first. If that fails, a few seconds of audio go to a protected server function, only to be turned into text, and are not stored.
- 04
Pattern engines
On your phoneRule packs in 20 languages and a concept engine look for how scam scripts are built: a request for a code, a push to a safe account, urgency. One word never triggers an alarm; the combination does.
- 05
Second opinion
Cloud, opt-inOnly when the on-device engines already see real risk, a language model reviews the transcript through an App Check protected function and returns a structured verdict. If it fails, the on-device verdict stands.
- 06
Action
On your phoneA clear on-screen warning, the Banking Shield, and one tap to hand the call to Guard, block, or report the number.
Business model: freemium.
Caller ID, spam blocking and essential protection are free, which drives installs and the community database.
Pro, VIP, Elite and Premium tiers and in-app Coin, billed through Google Play Billing.
Free users can see ads served through Google AdMob, including rewarded formats.
How we compare.
Based on each company's public product materials. Where we found no public documentation, we say Not documented rather than No.
| Cally | Truecaller | Hiya | |
|---|---|---|---|
| Caller ID and spam blocking | Yes | Yes | Yes |
| AI call screening assistant | Guard Hand-Off (acts against the scammer) | Yes (screens the caller) | Yes (screens the caller) |
| AI voice deepfake detection | Acoustic heuristics, not benchmarked | Yes | Yes |
| Keeps scammers talking to waste their time | Yes | Not documented | Not documented |
| Banking app warning during a suspicious call | Yes | Not documented | Not documented |
| Scam rule packs in 20 languages | Yes | Not documented | Not documented |
| Full dialer, SMS and contacts replacement | Yes | Partial | Partial |
Reviewed October 2026 from public materials. Competitor products change often; verify before relying on this table.
Four things that set Cally apart.
Most caller ID apps identify and block. Guard can take over the call and keep a suspected scammer talking, using their time instead of yours.
With Usage Access granted, Cally warns at the system level when a banking app is opened during a suspicious call. We found no public documentation of this in competing apps.
Social features ('How people save my number' labels & 'Caught Scammer' trophy cards) are designed to be shared on Instagram, TikTok and WhatsApp, which can lower acquisition cost.
Most detection rules run on the phone, and message bodies never leave the device. This is cheaper to run and easier to trust.