Every few months, another privacy story breaks and a fresh wave of “just use Signal” posts fills my feed. I have heard the recommendation for years. This time I actually took it — Signal replaced WhatsApp as my primary messenger for four weeks. Here is what I found.
What Signal actually is
Signal is a free messaging app run by the Signal Foundation, a US-based nonprofit. It uses the Signal Protocol — an open-source encryption standard so widely respected that WhatsApp itself licensed it — to end-to-end encrypt every message, call, and file you send. It has no ads. It does not sell you anything. It does not monetize your data because it has no meaningful data on you to sell.
Compared to Telegram, iMessage, or WhatsApp, the privacy story is not marketing spin. Signal genuinely holds less about you on its servers than any of them.
The interface
Signal on Android looks and works like every mainstream messenger. A list of conversations. Tap one to open it. Type at the bottom, hit send. Photo, video, voice, file, sticker, GIF — the attachment tray covers everything most people ever want.
What you do not get is the busy dashboard some rivals lean into. There is no news feed, no channels tab, no “for you” grid of apps within the app. Signal opens, shows you your messages, and gets out of the way.
Features I actually used
Disappearing messages. Per conversation, you can set an expiration timer — from 30 seconds to four weeks — and every message you send in that chat self-deletes after the timer runs. I set this to 24 hours for personal chats. Nothing about my daily conversations belongs on either device three months from now.
Groups. Signal supports groups up to 1,000 members. Admin controls are less elaborate than Telegram’s, but the essentials — muting, member permissions, media sharing — all work.
Voice and video calls. One-to-one and group calls. Quality on 4G was better than WhatsApp in my testing, and calls survived a subway signal drop that would have killed a WhatsApp call.
Stories. Signal added Stories a couple of years back. They are per-recipient (you choose who sees each one) and end-to-end encrypted. Whether you use them depends on whether your circle uses Signal at all.
The thing that is still missing
Signal does not have a cross-device cloud backup that survives losing your phone. If your Android device is stolen or wiped and you did not manually enable local backups plus keep the passphrase, your chat history is gone. You can pair Signal Desktop and an iPad, but those do not back-fill history — they only see conversations from the moment they were linked.
For people who treat chat history as their memory of a relationship, this is a real drawback. WhatsApp’s Google Drive backups are not beautiful, but they turn “I lost my phone” from a data-loss event into an inconvenience.
Battery and data
On a Pixel-class Android device running Android 15, Signal used noticeably less battery than WhatsApp over the same four weeks. Data usage was comparable. The app’s cold-start time is a shade slower than WhatsApp’s on cheaper devices, though on any recent phone the difference is imperceptible.
Who should install it
Install Signal if:
- People you talk with regularly are already on it.
- You send messages you would rather not see on someone’s server, even in encrypted form.
- You want to stop feeding metadata into WhatsApp’s data pipeline.
- You value software that has no interest in advertising to you.
Skip it (or use it as a secondary app) if:
- Nobody in your circle uses it yet — a messenger without your contacts is just a nice app.
- Your chat history is a keepsake and you do not want to think about backups.
- You rely on stickers, mini-games, or channels the way Telegram does them.
The verdict
Signal is not a WhatsApp replacement for most people, because a messenger without your contacts is a photo of a fireplace. But it is the messenger you should quietly nudge friends and family toward. It respects you in ways that make other apps look mildly disrespectful in comparison. Every meaningful conversation deserves to happen there.
Verdict: 4.5 / 5. Install it. Then install it for the people you talk to most.
Where to get it: the official Signal listing on the Google Play Store, or from signal.org — nowhere else.