The model, in their own accounts
Truecaller (Nasdaq Stockholm) and Gogolook, the publisher of Whoscall (Taiwan Stock Exchange), are the only two players in this category to publish audited accounts. No estimate, no leak — official financial reports, filed with their respective stock market regulators.
We name here only what these two companies publish themselves. No other player in the category publishes equivalent accounts — a fact, not a judgment.
What it's actually worth
Once we know advertising funds the service, the next question is simple: how much is a free user's attention and data worth to the industry?
Your contacts never signed anything
The best-documented mechanism in this category isn't advertising — it's the copying of your contact list. When someone installs this type of app, their contacts' names and numbers are often uploaded to the service's database, without those people ever installing or accepting anything.
Paying twice
On a free, ad-funded app, the bill doesn't stop at “$0.” It splits into two, and only one half is visible at install time:
What's visible
What isn't
What they declare themselves
Every Android app publishes a “Data safety” listing on Google Play — filled in by the developer itself. Here, line by line, is what the five most-installed apps in the category declare, captured on 25 July 2026:
| Official declaration | Truecaller | Whoscall | CallApp | Getcontact | Hiya | Egidio* |
|---|---|---|---|---|---|---|
| Data shared with third parties | Yes | Yes | Yes | Yes | Yes | Non-advertising |
| Contact collection | Yes | Yes | Yes | Yes | Yes | No |
| Location collection | Yes (approx. + precise) | — | Yes (approx. + precise) | — | — | No |
| Audio collection | Yes | — | — | Yes | — | No |
| SMS/message content shared with third parties | — | Yes | — | — | — | No |
| Data encrypted in transit | Yes | Yes | No | Yes | Yes | Yes |
| Secure connection in transit | Yes | Yes | No | Yes | Yes | Yes |
Sources: official Google Play “Data safety” listings, captured 25/07/2026 — Truecaller · Whoscall · CallApp · Getcontact · Hiya. *Egidio column: verified by direct review of the detection engine (100% local processing, no network access in detection code paths), ahead of the app's Google Play listing — to be recaptured as an official listing once live.
Why it's structurally different at Egidio
Egidio's detection engine runs entirely on the device. No call or message content ever leaves the phone to be analyzed elsewhere — this isn't a policy that could change one day, it's an architecture: the detection modules simply have no network access.
The price therefore doesn't fund a third-party advertising model to fill. It funds the service, period. It's the reverse asymmetry of the rest of the category: where “free” often means “funded elsewhere,” at Egidio the price is the proof there's nothing else to fund.
Frequently asked questions
Why are most call-blocking apps free?
Because an advertising model funds the service. Two major players in this category are publicly traded and publish their accounts: for both, advertising is a significant share of revenue. This isn't an accusation — it's what their own financial reports state.
Do these apps sell my data?
Their own official Google Play “Data safety” listings declare, for each of the five apps examined, sharing of at least one data category with third parties, and contact collection with no exception. Google's exact term is “sharing,” not “selling” — we use that word, not another.
How can my contacts end up in a database without ever installing the app?
Through the upload of an app user's contact list. This mechanism was explicitly documented by the Turkish regulator (KVKK decision no. 2017/61, dated 21/12/2017) as grounds for a judicial ban targeting 70 apps of this type, and by the Nigerian regulator regarding Truecaller's “Enhanced Search” feature.
Is Egidio's price justified if other apps are free?
The price covers the service — it doesn't fund a third-party advertising model. Egidio's detection engine runs 100% on-device, without sending call or messaging content anywhere, without collecting contacts, without sharing with advertisers.