Connected!

DOUBLE
BUMP

Meet. Bump. Remember.

Connect with people in the real world — just bump phones twice. No QR codes. No usernames. Just a physical moment.

App Store ▶ Google Play
How it works

Three steps.
One real connection.

1
Both open DoubleBump
You and your friend each tap into the Bump screen. That's it.
2
Tap phones together — twice
The double tap is both the gesture and the proof. BLE makes sure you're within 30 cm.
3
You're connected!
Screens glow yellow. Your connection is saved — forever on your map.
⚠   Both phones must be moving. One-sided won't work.
Features

Your real-world social map.

Every bump builds a permanent memory. See your connections, where you met, and every moment you've shared.

⚡
Bump to Connect
Double-tap phones together to create a real-world connection. No usernames, no follows — just a physical moment.
🗺️
Memory Map
Every bump pins a location on your personal map. Relive exactly where you met each person.
📖
Encounter Memory
Add a photo and a 100-character note to each bump. Private between you two — no public feed.
🔥
Relationship Levels
Stranger → Acquaintance → Friend → Close Friend → Best Friend → Soul Mate. Levels unlock as you keep bumping.
📡
Live Nearby Radar
See who around you has DoubleBump open before you bump. Bluetooth scans up to 2 m — you see a name, then you act.
🎮
8-bit Identity
Pixel-art animations. Retro font. Every interaction is tactile and playful — by design.
Security Model

Three layers. No spoofing.

A connection can only happen if all three layers pass simultaneously.

BLE
Proximity proof — Bluetooth RSSI must exceed −40 dBm (~30 cm). Remote spoofing is physically impossible.
BUMP
Intent proof — The double-tap gesture is required. A single accidental nudge will never create a connection.
MOTION
Shared event proof — Motion signatures from both phones are compared. Both devices must have experienced the same physical collision within ±400 ms.
FAQ

Frequently asked questions

How does DoubleBump work?

Both users open DoubleBump and tap their phones together twice. Bluetooth Low Energy confirms you're within 30 cm. Motion sensors verify both devices felt the same physical impact within 400 ms. The double-tap confirms mutual intent. All three checks must pass simultaneously — accidental bumps and remote spoofing are both impossible.

Does DoubleBump work between iPhone and Android?

Yes. The cross-platform BLE protocol is live — iPhone and Android users can bump with each other. DoubleBump uses Bluetooth Manufacturer Data to detect cross-platform devices reliably.

What happens after I bump someone?

Both screens glow yellow and you feel a haptic response. The connection is permanently saved on your Memory Map with the location where you met. You can add a photo and a 100-character note (Encounter Memory) to capture the moment. No feed, no algorithm — just your private map.

What are relationship levels?

Six levels unlock as you keep bumping the same person: Stranger → Acquaintance → Friend → Close Friend → Best Friend → Soul Mate. Levels persist forever and keep building with every bump.

Can someone fake a DoubleBump connection remotely?

No. Remote spoofing is physically impossible. BLE proximity requires being within 30 cm. The motion signature must match within 400 ms of a real physical collision. Without actually being there and physically tapping phones, none of the three layers can pass.

Is DoubleBump free?

Yes. DoubleBump is free on iOS and Android. Locked profile details of non-connected users can be unlocked by watching a short rewarded ad.

Ready to bump?

Free on iOS and Android.

App Store ▶ Google Play