Independent studio · New Jersey
Software that puts people first.
SparrowTek makes native iPhone apps and tools for the open web. We design for privacy first and build on open protocols wherever we can.
The apps
Meet the flock.
Eight apps for recovery, calm, podcasting, money and learning. Each one does a single job well and treats the people who use it with respect.
-
Anchor
A steady place in the storm.
No. 01Wellbeing
A private, offline-first companion for anyone choosing sobriety. A live counter celebrates every milestone, a quick daily check-in tracks mood and cravings, and an emergency toolkit is there the moment a craving hits.
- Field marks
- No account · No data collection · Works offline
- Habitat
- iPhone · App Store
-
ReAttune
Find your frequency.
No. 02Wellbeing
Sound sessions for anxious days, scattered afternoons and sleepless nights. Every tone is generated live on your iPhone (nothing is a recording) and paired with immersive visuals and a gentle breath pacer.
- Field marks
- Live-generated sound · Breath pacer · Sound studio
- Habitat
- iPhone · App Store
-
Effem
Social podcasting on open protocols.
No. 03Podcasting
A podcast player built on the open Podcast Index and the AT Protocol. Search every show, subscribe, download, and talk about episodes with the identity you already own.
- Field marks
- AT Protocol · Podcast Index · Bring your own identity
- Habitat
- iPhone · Coming to the App Store
-
Boostz
Read every boost on air.
No. 04Podcasting
A command center for podcast hosts. Every boost and every note, from cards, Lightning, podcast apps, Ko-fi and Patreon, lands in one inbox to read at the mic. The money goes straight to the host.
- Field marks
- Built for hosts · One inbox · Every source
- Habitat
- The web
-
Avocadough
Lightning in your pocket.
No. 05Money
Send and receive sats from the Lightning wallet you already use, connected through Nostr Wallet Connect. Your money stays in your wallet. Avocadough is the remote control.
- Field marks
- Nostr Wallet Connect · Lightning · Open source
- Habitat
- iPhone · App Store
-
Avocadoge
Your Dogecoin. Your keys.
No. 06Money
A lightweight, self-custody Dogecoin wallet. Your keys are created on your iPhone and never leave it, and Enhanced Privacy Mode verifies every transaction directly against the Dogecoin network.
- Field marks
- Self-custody · No account · Full SPV mode
- Habitat
- iPhone · App Store
-
Perch
Watch real Bitcoin land.
No. 07Money
Paste any Stacks address or .btc name and watch the Bitcoin your STX earns from Stacking land, cycle after cycle, right on your Lock Screen. Perch reads public chain data and never touches your funds.
- Field marks
- Watch-only · No account · Lock Screen widgets
- Habitat
- iPhone · App Store
-
Little Man Computer
How computers think, one mailbox at a time.
No. 08Learning
Learn how a computer really works by programming the Little Man Computer, a classic model of the von Neumann architecture created by Dr. Stuart Madnick in 1965. Our very first app, on the App Store since 2016.
- Field marks
- Assembly language · Open source · Since 2016
- Habitat
- iPhone & iPad · App Store
How we build
Four rules we build by.
-
Private by design
Anchor works offline, with no account and no data collection. Avocadoge and Perch never ask you to sign up either.
Seen in
-
You hold the keys
Avocadoge creates your keys on your iPhone and they never leave it. Avocadough is a remote for a wallet you already own. Boostz sends support straight to the host.
Seen in
-
Open protocols
Effem is built on the AT Protocol and the Podcast Index, and Avocadough speaks Nostr Wallet Connect. We build on networks no single company controls, us included.
Seen in
-
Native to the core
Our iPhone apps are written in Swift and SwiftUI and kept current with each new iOS, so they feel at home on your iPhone instead of merely running on it.
Seen in
Open source
The building blocks are yours, too.
The Swift packages underneath our apps are open source. Use them, fork them, send a fix.
- AT Protocol CoreATProtocol The networking layer for AT Protocol apps: OAuth, sessions, identity resolution and repo records. tangled.org
- AT Protocol EffemKit The client for Effem’s AppView: subscriptions, comments, bookmarks, lists and profiles. tangled.org
- AT Protocol · Lightning AvocadoughKit Turns an AT Protocol identity into a Bitcoin payment address, from handle to invoice. tangled.org
- Podcasting 2.0 PodcastIndexKit A client for the Podcast Index API: search, podcasts, episodes, categories and value-for-value. github.com
- Nostr CoreNostr Nostr protocol primitives in Swift: keys, events and signing. github.com
- Nostr NostrKit Relay management, caching and Nostr Wallet Connect for Apple platforms. github.com
- Cashu CashuKit Cashu ecash for Apple platforms, built on CoreCashu. Currently in beta. github.com
- Dogecoin DogecoinKit A pure Swift SDK for SPV Dogecoin wallets: HD keys, transactions and peer-to-peer sync. github.com
- Stacks StacksKit A native Swift take on the Stacks.js core: keys, transactions, Clarity values and stacking. github.com
- Education CoreLittleManComputer The Little Man Computer as a Swift package: machine, assembler and a runner that plays nicely with SwiftUI. github.com
- Networking NetworkingKit Typed endpoints on top of URLSession and Swift concurrency. github.com
- Keychain Vault Save, read and delete strings in the iOS and macOS keychain. github.com
The studio
Made in New Jersey.
SparrowTek LLC is an independent software studio. Our first app, Little Man Computer, went live on the App Store in November 2016. Since then we’ve built apps for recovery, calm, podcasting and money, and open-sourced the Swift packages underneath them.
Have an app you’d like to build together? We’d love to hear about it.
- First App Store release
- 2016
- Apps on the App Store
- 6
- Open-source Swift projects
- 30+
- Trackers on this website
- 0