daatlas — Open-Source Diabetes Data Bridge for iOS

Henrique Peralta — Wed, 03 Jun 2026 09:11:11 +0000

Your CGM, pump, and wearable data. In Apple Health. For free.

daatlas is a privacy-first iOS app that unifies fragmented diabetes data — glucose readings, insulin deliveries, carbs, and Oura Ring vitals — into Apple Health's unified timeline. No backend, no account, no subscription.

View on GitHub

The problem

If you manage diabetes with a CGM and an insulin pump, your data is already scattered. Add a wearable like an Oura Ring and it gets worse — glucose in Nightscout, sleep in Oura, activity somewhere else. Apple Health could be the single source of truth, but nothing bridges all of it automatically.

The first solution

It started with daatlas-healthsync — a lightweight app that did one thing: sync Nightscout data (glucose, insulin, carbs) to Apple Health. No frills, no dashboard, just a bridge. That was enough for a while.

Then came the wearables

Once the glucose data was in Apple Health, the next question was obvious — what about sleep? HRV? Recovery? The Oura Ring had all of it, but it was locked away in its own silo. So Oura integration came next: sleep stages, HRV, SpO2, heart rate, temperature — all synced to Apple Health without needing a subscription.

One app for all of it

With glucose, insulin, and wearable data all in one place, the full picture finally made sense. daatlas grew into a proper app — dashboard, trends, budget tracking, Dexcom support — built on top of the same bridge that started it all.

daatlas-healthsync still exists as a standalone app for anyone who just wants the simple Nightscout sync without the rest.

At a Glance

🩸 Multi-source	🔒 100% On-device	📊 One timeline
Nightscout, Dexcom, Oura Ring, Tandem	No server. No account. Data stays on your phone.	Glucose, insulin, sleep, HRV — all in Apple Health

How it works

Nightscout  ──┐
Dexcom      ──┼──►  daatlas  ──►  Apple Health  ──►  Any app in the ecosystem
Oura Ring   ──┘

Once synced, your data lives in Apple Health — available to every app in the ecosystem. daatlas is just the bridge.

Key Features

Glucose sync — Nightscout SGVs or Dexcom Share readings in mg/dL or mmol/L
Insulin tracking — Bolus and basal deliveries mapped to HealthKit insulin types
Oura sync — Sleep, HRV, readiness, SpO2, heart rate, temperature (no Oura subscription needed)
Deduplication — Never writes the same record twice (Nightscout _id + timestamp fallback)
Background sync — Configurable intervals from 5 minutes to 2 hours
Sync logs — Full audit trail of every sync operation
Live Activities — Glucose on Dynamic Island and Lock Screen
Claude export — Export a date-range data dump for AI analysis

Integrations

Source	Method
Nightscout	REST API — glucose, insulin, carbs
Dexcom	Share API — CGM readings
Oura Ring	OAuth token or CSV export (no subscription required)
Tandem t:slim X2	Via Nightscout + tconnectsync

Why open source

Diabetes tooling should be free. The data belongs to you. daatlas builds on top of the incredible open-source diabetes community — Nightscout, Cracked-Oura, tconnectsync — and gives back under GPL v3.

Tech Stack

iOS 16+ · SwiftUI · HealthKit · Swift async/await · Actor concurrency · XcodeGen

The entire service layer is built with Swift actor types — compile-time thread safety, no manual locking, no data races. HealthKitService is the single write path to Apple Health.

What's next

Live Activity improvements — real-time glucose on Dynamic Island with trend arrows and time-in-range
Food logging — AI-assisted carb estimation from photos, barcode scanning, meal history
Apple Watch app — quick sync status, glucose glance, complication support
Shortcuts & automation — Siri Shortcuts, glucose-triggered automations
VO2 Max sync — Oura VO2 Max to HealthKit
Widget — home screen glucose + sleep score + HRV
CSV / PDF export — data dump for clinic visits
iCloud sync — settings and sync history across devices

Known Limitations

Oura without membership requires manual export — no real-time background sync; re-export needed for new data
No offline sync — all syncs require network connectivity
iOS 16+ only

Great apps in the diabetes space

Gluroo — a beautifully designed diabetes management app. If you want a polished all-in-one experience, check it out.

Stash Diabetes — great app for managing and tracking diabetes supplies. Highly recommended.

xDrip4iOS — open-source CGM reader for iOS. Supports a wide range of sensors and is the go-to for DIY CGM setups.

Acknowledgements

Cracked-Oura — reverse-engineered Oura API access without a subscription
tconnectsync-heroku — Tandem pump data bridge to Nightscout
Nightscout — the open-source diabetes platform that makes all of this possible

daatlas is not a medical device. It is a data utility for personal use. Always consult your healthcare provider for diabetes management decisions.

View source on GitHub →

Escudo - Privacy-First Personal Finance for iOS

Henrique Peralta — Tue, 02 Jun 2026 21:39:53 +0000

Your finances. On your phone. Nowhere else.

A privacy-first personal finance app that connects your banks, brokerage, and investment accounts into one unified dashboard — entirely on-device, no backend, no account required, no subscription.

View on GitHub

At a Glance

🏦 Multi-source	🔒 100% On-device	📊 Full picture
Banks, Revolut, Trading 212 and more	No server. No account. Your data stays in your Keychain.	Net worth, spending, investments — all in one place

Screenshots

Log	Insights	Budget
Transaction Entry	Settings

About Escudo

Built out of two frustrations: every decent finance app costs a monthly subscription, and none of them support Trading 212.

Escudo connects your banks, brokerage, and investment accounts and gives you a single view of your net worth, spending, and investments — without your data ever leaving your phone.

Key Features

Net worth dashboard — aggregated balance across all accounts and investment portfolio P&L
Unified transaction log — every account in one feed, auto-categorised
Spending insights — breakdown by category and trends over time
Budget tracking — per-category budgets with visual progress dials
Multi-currency — EUR, GBP, USD with stored exchange rates
Recurring transactions — template-based recurring transaction engine
Shortcuts support — deep linking via escudo:// URL scheme

Integrations

Source	Method
Trading 212	REST API — portfolio, orders, dividends
Revolut	Enable Banking OAuth 2.0
Bankinter PT	Enable Banking OAuth 2.0
SIBS	SIBS Open Banking (PT market)
CSV import	Revolut & Bankinter statements

All credentials live in the iOS Keychain — never in UserDefaults, never in iCloud, never on a server.

Known Limitations

Enable Banking does not expose credit card accounts — only bank accounts and transactions are available through the PSD2 API; credit card balances and transactions are not accessible
No token auto-refresh for Enable Banking — manual re-auth when tokens expire
Categorisation rules are hardcoded (no custom rule UI yet)

Tech Stack

iOS 17+ · SwiftUI · Core Data · Swift async/await · XcodeGen

Acknowledgements

Dime — a beautifully designed open-source iOS finance tracker that was a direct inspiration for Escudo.

View source on GitHub →

DEV Community: Henrique Peralta

daatlas — Open-Source Diabetes Data Bridge for iOS

The problem

The first solution

Then came the wearables

One app for all of it

At a Glance

How it works

Key Features

Integrations

Why open source

Tech Stack

What's next

Known Limitations

Great apps in the diabetes space

Acknowledgements

Escudo - Privacy-First Personal Finance for iOS

At a Glance

Screenshots

About Escudo

Key Features

Integrations

Known Limitations

Tech Stack

Acknowledgements