JemRec

about

description

A call recorder for unrooted Android — phone and messenger calls. One APK. No root, no Shizuku, no companion app, no computer: the phone sets itself up. **How it works.** Android's voice-call audio source carries both sides of a call, but reading it takes permissions no ordinary app can hold. The shell user that an ADB session runs as holds them. JemRec embeds an ADB client and pairs with the phone's own Wireless debugging over 127.0.0.1, the same six-digit pairing a laptop would do, both ends on one handset. Nothing leaves the phone. In an ADB session of a few seconds the app launches a small shell-privileged daemon, then closes it. The daemon watches the call state and writes each call to a file; the app is not on the audio path at all, and holds no microphone permission. Every connection between the two is authenticated both ways. **Recordings** are Ogg Opus files in the phone's Recordings/JemRec folder, where any file manager or music app opens them. A recording starts when the call is answered: no ringing, and a call nobody answered is not kept. Automatic mode records every call; ask-first mode records nothing until you tap Record on the start-of-call notification. Messenger calls (WhatsApp, Telegram, Signal, Viber) can be recorded too, both sides, app by app, on Android 14+; all but Signal tested. After each call a silent notification shows the recording. JemRec also tells you when something is wrong: a recording that came out silent, a recorder that is down (and why), or a call that went unrecorded. **Keeping and cleaning up.** A Calls tab shows the call log, with each recording and, for an unrecorded call, why. Delete moves a recording to Recently deleted for 30 days. Auto-delete, off by default, removes old recordings and very short calls into the same place, never ones marked to keep. You can keep only some people's calls, and name files with the caller - or Honor's way, so Honor's Phone app plays them from its call history. **Setup** takes two things by hand, once: turn on Developer options, then USB debugging and Wireless debugging, and type the pairing code into JemRec's notification. The pairing survives reboots. The recorder does not: after a restart it is rebuilt by itself on the next Wi-Fi, if the phone lets JemRec start on its own. Wi-Fi is needed only to rebuild the recorder, never to record. **What stays on.** USB debugging and Wireless debugging stay on for as long as JemRec is installed, and JemRec turns them back on if they go off: the recorder cannot run without them. While they are on, a computer paired with the phone can connect to it on the same Wi-Fi. Android shows a notification while debugging is on, which JemRec hides if you ask. To turn debugging off for good, uninstall JemRec first. **Requirements.** Android 12 or newer, and a phone whose audio hardware hands over the voice-call source. Both sides have been recorded on an Honor Magic 8 Pro, a Samsung Galaxy S20 and a OnePlus on LineageOS. The self-test in Settings → Diagnostics answers it for your phone in a second. **Recording calls is your responsibility.** Consent law differs by country and state. This app records what you tell it to and warns nobody on your behalf. **What it does not ask for:** no RECORD_AUDIO, no blanket storage access, no phone state. INTERNET is required by Android for any TCP socket, including one to 127.0.0.1, which is the only address this app connects to. READ_MEDIA_AUDIO is asked for only to list recordings made before a reinstall. READ_CALL_LOG and READ_CONTACTS are optional: they tell JemRec who a call was with, and let it notice one that went unrecorded. MANAGE_ONGOING_CALLS, allowed by the recorder unless you turn exact call tracking off, tells JemRec when a call is answered and ends; JemRec never acts on a call. Notification access is granted only if you ask for it, to hide Android's debugging notification or to name a messenger call's caller, and is used for nothing else.

publisher

78ce6faa72264387284e647ba6938995735ec8c7d5c5a65737e55130f026307d

first seen

2026-10-18T05:39:07.712808+00:00

last event

2026-10-26 14:34 UTC

website

https://jemcik.github.io/JemRec/

install

zapstore.dev or any Zapstore-compatible client

topics

#phone & sms #recorder

source & build

repository

https://github.com/jemcik/jemrec

arch flags

android-arm64-v8a android-armeabi-v7a

manifest

missing

releases (kind 30063)

7 releases indexed; latest 0.22.

version	channel	released	event
0.22	main	2026-10-26 14:34 UTC	4ed68178…
0.19.2	main	2026-10-24 13:57 UTC	5d411399…
0.19.1	main	2026-10-23 22:56 UTC	5312bfb4…
0.16	main	2026-10-21 17:30 UTC	cd44b197…
0.15	main	2026-10-21 11:15 UTC	a0a48415…
0.13	main	2026-10-20 19:09 UTC	c66fcbb5…
0.8	main	2026-10-09 13:06 UTC	8a2b8cbf…

assets & verification

Every app, release and asset event is schnorr-verified (NIP-01 id + signature) before it enters the catalog, and assets are content-addressed by sha256. We subscribe read-only to the catalog relay — never write to it.

0.22 — jemrec-0.22.apk

sha256

b088c7f5915c203d182406ecd211fdb68c7498d3094e182597d4e5fc361af49a

size

9.6 MB

archs

android-arm64-v8a, android-armeabi-v7a

version code

2200

apk cert sha256

50aeab3630f0198ea3845db51413b1ad29582f78240fa2df6fe55ba8537afdf8

download

jemrec-0.22.apk

0.19.2 — jemrec-0.19.2.apk

sha256

36be49f2e7fc9460791e5e942f61580fbda42568a829b558086949baef69178c

size

9.5 MB

archs

android-arm64-v8a, android-armeabi-v7a

version code

1902

apk cert sha256

50aeab3630f0198ea3845db51413b1ad29582f78240fa2df6fe55ba8537afdf8

download

jemrec-0.19.2.apk

0.19.1 — jemrec-0.19.1.apk

sha256

219200d114d583a3d7bd1ad5620fd3f7abb906bd212aae400d4735036200bba2

size

9.5 MB

archs

android-arm64-v8a, android-armeabi-v7a

version code

1901

apk cert sha256

50aeab3630f0198ea3845db51413b1ad29582f78240fa2df6fe55ba8537afdf8

download

jemrec-0.19.1.apk

0.16 — jemrec-0.16.apk

sha256

d7b3187743800fe1a4a458760f95d249bda1de60f10852e306c1c02f79a4b3fb

size

8.3 MB

archs

android-arm64-v8a, android-armeabi-v7a

version code

1600

apk cert sha256

50aeab3630f0198ea3845db51413b1ad29582f78240fa2df6fe55ba8537afdf8

download

jemrec-0.16.apk

0.15 — jemrec-0.15.apk

sha256

1993e3d7520f5e0535e84cdd9ebd5caed305f2bfcd710ca754308a724b837c12

size

8.3 MB

archs

android-arm64-v8a, android-armeabi-v7a

version code

1500

apk cert sha256

50aeab3630f0198ea3845db51413b1ad29582f78240fa2df6fe55ba8537afdf8

download

jemrec-0.15.apk

0.13 — jemrec-0.13.apk

sha256

916e4bae6e829e1e771b7374a99cca0680ef3de44cb9aa3630147874be6a8762

size

8.2 MB

archs

android-arm64-v8a, android-armeabi-v7a

version code

1300

apk cert sha256

50aeab3630f0198ea3845db51413b1ad29582f78240fa2df6fe55ba8537afdf8

download

jemrec-0.13.apk

Showing the newest 6 asset descriptors; the full set is in /api/apps/78ce6faa…